Welcome to LOGO!

Dear customer,
Thank you for purchasing LOGO!, and congratulations on your
decision. In LOGO! you have acquired a logic module that meets
the stringent quality requirements of ISO 9001.
LOGO! is universal in application. Its comprehensive functionality
and great ease of use make it a highly costefficient solution for
virtually any application.

LOGO! documentation
This LOGO! manual tells you how to install, program and use
LOGO!.
You can find information on wiring in the LOGO! manual as well as
in the LOGO! product information that is supplied with each device. You can get further information on programming LOGO! via
the PC in the LOGO!Soft Comfort online help system. LOGO!Soft
Comfort is the programming software for PCs. It runs under
WINDOWS and will help you get to know LOGO! and to write,
test, print out and archive programs independently of LOGO!.

Guide to the manual

We have subdivided this manual into 9 chapters:
 Getting to Know LOGO!
 Installing and Wiring LOGO!
 Programming LOGO!
 LOGO! Functions
 Parameterizing LOGO!
 LOGO!s Program Modules
 LOGO! Software
 Applications
 Appendices

Additional support
You can find answers to your LOGO! questions quickly and easily
on the Internet at http://www.ad.siemens.de/logo.

LOGO! Manual
A5E00067781 01

Welcome to LOGO!
Safety guidelines
This manual contains notices which you should observe to ensure
your own personal safety, as well as to protect the product and
connected equipment. These notices are highlighted in the manual by a warning triangle and are marked as follows according to
the level of danger:

!
!
!

Danger
Indicates that death, severe personal injury or substantial damage to property will result if proper precautions are not taken.

Warning
Indicates that death, severe personal injury or substantial damage to property can result if proper precautions are not taken.

Caution
Indicates that personal injury or damage to property can result
if proper precautions are not taken.

Note
Draws your intention to particularly important information on
the product, handling the product, or to a particular part of the
documentation.

ii

Warning
Only qualified personnel should be allowed to install and
work on this equipment. Qualified personnel are defined as
persons who are authorized to commission, to ground and to
tag circuits, equipment and systems in accordance with established safety practices and standards.

Warning
This device may only be used for the applications described in
the catalog and the technical description, and only with non
Siemens devices or components if they have been approved
or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed correctly, and operated
and maintained as recommended.

LOGO! Manual
A5E00067781 01

Welcome to LOGO!
Copyright  Siemens AG 1996 All rights reserved
The reproduction, transmission or use of this document or its contents is not permitted
without express written authority. Offenders will be liable for damages. All rights reserved, in
particular in the event of a patent being granted or the registration of a utility model or design.

Disclaimer of Liability
We have checked the contents of this manual for agreement with the hardware and software described. Nevertheless, discrepancies cannot be ruled out, and we therefore cannot
guarantee full correspondence. However, the data in this manual is reviewed regularly and
any necessary corrections included in subsequent editions. Suggestions for improvement
are welcomed.

LOGO! Manual
A5E00067781 01

iii

Contents
1

Getting to Know LOGO! . . . . . . . . . . .

Installing and Wiring LOGO! . . . . . .

2.1 Installing/Removing LOGO! . . . . . . . . . . . . . . . . . . . .

2.2 Wiring LOGO! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 Connecting the Power Supply . . . . . . . . . . . . . . . . . . .
2.2.2 Connecting LOGO!s Inputs . . . . . . . . . . . . . . . . . . . .
2.2.3 Connecting Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4 Connecting the ASi Bus (LOGO! ...B11 Only) . . . . .
2.2.5 LOGO!...B11 on the ASi Bus . . . . . . . . . . . . . . . . . . .
2.3 Switching LOGO! On/Resumption of
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10
12
12
14
19
21
22
24

Programming LOGO! . . . . . . . . . . . . .

27

3.1
3.2

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blocks and Block Numbers . . . . . . . . . . . . . . . . . . . . .

28
30

3.3
3.4
3.5
3.6
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
3.6.8
3.6.9
3.7

From the Circuit Diagram to LOGO! . . . . . . . . . . . . .

The 4 Golden Rules for Working with LOGO! . . . .
Overview of LOGO!s menus . . . . . . . . . . . . . . . . . . .
Entering and Starting a Program . . . . . . . . . . . . . . . .
Switching to Programming Mode . . . . . . . . . . . . . . . .
First Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Entering a Program . . . . . . . . . . . . . . . . . . . . . . . . . . .
Second Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deleting a Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deleting a Number of Interconnected Blocks . . . . . .
Correcting Typing Errors . . . . . . . . . . . . . . . . . . . . . . .
? on the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deleting a Program . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Space and Size of a Circuit . . . . . . . . . . . . .

33
36
38
39
39
40
42
49
55
56
57
57
58
59

iv

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Contents

LOGO! Functions . . . . . . . . . . . . . . . .

62

4.1 Constants and Connectors Co . . . . . . . . . . . . . . . .

4.2 List of Basic Functions BF . . . . . . . . . . . . . . . . . . .
4.2.1 AND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2 AND with RLO Edge Detection . . . . . . . . . . . . . . . . . .
4.2.3 NAND (AND Not) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4 NAND with RLO Edge Detection . . . . . . . . . . . . . . . .
4.2.5 OR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.6 NOR (OR Not) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.7 XOR (Exclusive OR) . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.8 NOT (Negation, Inverter) . . . . . . . . . . . . . . . . . . . . . . .

63
65
67
67
68
69
69
70
71
71

4.3 Fundamentals of Special Functions . . . . . . . . . . . . .

4.3.1 Description of the Inputs . . . . . . . . . . . . . . . . . . . . . . .
4.3.2 Time Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3 Clock Buffering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4 Retentivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5 Degree of Protection . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.6 Gain and Offset Calculation for Analog Values . . . .
4.4 List of Special Functions SF . . . . . . . . . . . . . . . . . .
4.4.1 On Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2 Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.3 On/Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.4 Retentive On Delay . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.5 Latching Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.6 Current Impulse Relay . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.7 Interval Time-Delay Relay Pulse Output . . . . . . . .
4.4.8 Edge-Triggered Interval Time-Delay Relay . . . . . . . .
4.4.9 Seven-Day Time Switch . . . . . . . . . . . . . . . . . . . . . . . .
4.4.10 Twelve-Month Time Switch . . . . . . . . . . . . . . . . . . . . .
4.4.11 Up/Down Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.12 Operating Hours Counter . . . . . . . . . . . . . . . . . . . . . .
4.4.13 Symmetrical Clock Pulse Generator . . . . . . . . . . . . .
4.4.14 Asynchronous Pulse Generator . . . . . . . . . . . . . . . . .
4.4.15 Random Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.16 Frequency Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.17 Analog Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.18 Analog Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . .

72
73
74
75
75
76
76
77
80
82
84
86
88
90
92
94
95
100
102
105
108
110
111
113
115
118

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Contents
4.4.19 Stairwell Light Switch . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.20 Dual-Function Switch . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.21 Message Texts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parameterizing LOGO! . . . . . . . . . . . .

5.1 Switching to Parameterization Mode . . . . . . . . . . . .

5.1.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2 Selecting a Parameter . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.3 Changing a Parameter . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Setting the Time (LOGO! ... C) . . . . . . . . . . . . . . . . . .

122
124
126

129
130
130
131
132
135

LOGO! Program Modules . . . . . . . . .

137

6.1

Overview of the Modules . . . . . . . . . . . . . . . . . . . . . . .

138

6.2
6.3

139

6.4

Removing and Inserting Modules . . . . . . . . . . . . . . .

Copying a Program from LOGO! to the
Program Module/Card . . . . . . . . . . . . . . . . . . . . . . . . .
Copying from the Module to LOGO! . . . . . . . . . . . .

LOGO! Software . . . . . . . . . . . . . . . . .

7.1
7.2
7.3

Possible Applications for LOGO! Software . . . . . .

Connecting LOGO! to a PC . . . . . . . . . . . . . . . . . . . . .
Transfer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

141
142

145
147
148
149

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Contents

Applications . . . . . . . . . . . . . . . . . . . . .

8.1
8.1.1
8.1.2
8.1.3
8.1.4
8.2
8.2.1
8.2.2
8.2.3
8.2.4
8.2.5
8.3
8.3.1
8.3.2
8.4
8.4.1
8.4.2
8.4.3
8.5

Stairwell or Hall Lighting . . . . . . . . . . . . . . . . . . . . . . .

Demands on Stairwell Lighting . . . . . . . . . . . . . . . . . .
Previous Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lighting System with LOGO! . . . . . . . . . . . . . . . . . . .
Special Features and Enhancement Options . . . . . .
Automatic Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demands on an Automatic Door . . . . . . . . . . . . . . . .
Previous Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Control System with LOGO! . . . . . . . . . . . . . . .
Special Features and Enhancement Options . . . . . .
Enhanced LOGO! 230RC Solution . . . . . . . . . . . . . .
Ventilation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demands on a Ventilation System . . . . . . . . . . . . . . .
Advantages of Using LOGO! . . . . . . . . . . . . . . . . . . .
Industrial Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demands on the Gate Control System . . . . . . . . . . .
Previous Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced LOGO! Solution . . . . . . . . . . . . . . . . . . . . .
Centralized Activation and Surveillance
of Several Industrial Gates . . . . . . . . . . . . . . . . . . . . .
Demands on the Gate Control System . . . . . . . . . . .
Fluorescent Luminaires . . . . . . . . . . . . . . . . . . . . . . . .
Demands on the Lighting System . . . . . . . . . . . . . . .
Previous Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluorescent Luminaire Control with LOGO! 230RC
Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demands on the Control System of a
Rainwater Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Previous Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rainwater Pump with LOGO! 230RC . . . . . . . . . . . .
Special Features and Enhancement Options . . . . . .
Further Potential Applications . . . . . . . . . . . . . . . . .

8.5.1
8.6
8.6.1
8.6.2
8.6.3
8.7
8.7.1
8.7.2
8.7.3
8.7.4
8.8

LOGO! Manual
A5E00067781 01

150
151
151
151
152
155
156
156
157
157
160
160
163
163
166
168
168
169
171
172
173
177
177
178
179
181
182
182
183
184
185

vii

Contents

Technical Specifications . . . . . . . . . .

A.1
A.2
A.3
A.4

General Technical Specifications . . . . . . . . . . . . . . .

Technical Specifications: LOGO! 230... . . . . . . . . . .
Technical Specifications: LOGO! 24 Basic . . . . . . .
Technical Specifications: LOGO! 24 Long . . . . . . .

188
190
193
196

A.5
A.6

Technical Specifications: LOGO! 12... . . . . . . . . . . .

Technical Specifications:
LOGO!Power 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications:
LOGO!Power 24 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications:
LOGO! Contact 24/230 . . . . . . . . . . . . . . . . . . . . . . . . .

199

A.7
A.8

188

203
205
207

Determining Memory Requirements

208

Determining the Cycle Time . . . . . . .

210

LOGO! Without a Display . . . . . . . . .

212

LOGO! ...LB11:
Active-Passive Switchover . . . . . . .

215

LOGO! Menu Structure . . . . . . . . . . .

217

Order Numbers . . . . . . . . . . . . . . . . . . . . . .

218

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . .

220

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

221

viii

LOGO! Manual
A5E00067781 01

1 Getting to Know LOGO!

What is LOGO! ?
LOGO! is the universal logic module from Siemens.
LOGO! integrates
 Control functions
 An operating and display unit
 Power supply
 An interface for program modules and a PC cable
 Ready-to-use basic functions that are often required in
day-to-day operation, such as functions for on/off delays
and current impulse relays
 Time switch
 Binary markers
 Inputs and outputs according to the device type
What can LOGO! do?
You can use LOGO! for domestic and installation engineering tasks (e.g. stairway lighting, external lighting, sun
blinds, shutters, shop window lighting etc.), switch cabinet
engineering and mechanical and apparatus engineering
(e.g. gate control systems, ventilation systems, or rainwater pumps etc.).
You can also use LOGO! for specific control systems in
conservatories or greenhouses, for signal preparation in
control systems and, with the ASi variant, you can have
on-site centralized control of machines and processes.
There are special variants without an operating unit for serial applications in the construction of small machines, apparatus and control cabinets and the field of installation.

LOGO! Manual
A5E00067781 01

Getting to Know LOGO!

What device types are available?
There are LOGO! models for 12 V DC, 24 V DC, 24 V AC
and 230 V AC as:
 A standard variant with 6 inputs and 4 outputs with dimensions of 72 x 90 x 55 mm
 A variant without a display with 6 inputs and 4 outputs
with dimensions of 72 x 90 x 55 mm
 A variant with 8 inputs and 4 outputs with dimensions of
72 x 90 x 55 mm
 A long variant with 12 inputs and 8 outputs with dimensions of 126 x 90 x 55 mm
 A bus variant with 12 inputs and 8 outputs, and additional AS interface bus connection, via which 4 further
inputs and 4 further outputs are available in the bus system. All this is packed into dimensions of
126 x 90 x 55 mm.
All variants include 29 ready-to-use basic and special functions for program creation.
Its your choice
The various variants can be adapted very easily to your
own specific task.
LOGO! provides solutions ranging from the small domestic
installation through small automation tasks to extensive
tasks integrating the AS interface bus system.

LOGO! Manual
A5E00067781 01

Getting to Know LOGO!

How LOGO! is structured
2
1
I1 I2 I3 I4 I5 I6 I7 I8

SIEMENS
6

90

35

LOGO!...standard variant

L1 N

Q1

Q2

Q3

Q4

3
72

55

I1 I2 I3 I4

I5 I6 I7 I8

I9 I10 I11 I12

AS interface

SIEMENS

35

90

L1 N

LOGO!...L/LOGO!...LB11

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

3
126

LOGO! Manual
A5E00067781 01

Power supply

Inputs

Outputs

Module shaft with

cover

Control panel
(not with RCo)

LCD
(not with RCo)

AS interface
connection
(only with LB11)

Getting to Know LOGO!

How to recognize which LOGO! model you have
LOGO!s designation contains information on various characteristics:
 12: 12 V DC variant
 24: 24 V DC variant
 230: 115/230 V AC variant
 R: Relay outputs (without R: Transistor output)
 C: Integrated seven-day time switch
 o: Variant without display
 L: Twice the number of outputs and inputs
 B11: slave with AS interface bus connection
We also use icons to describe the different types of LOGO!
They are used whenever information refers to only some of
the LOGO! variants:
Standard variant with 6 or 8 inputs and 4 outputs with dimensions of 72 x 90 x 55 mm
Standard variant without a display with 6 or 8 inputs and
4 outputs with dimensions of 72 x 90 x 55 mm
..L variant with 12 inputs and 8 outputs with dimensions of
126 x 90 x 55 mm
..B11 variant with 12 inputs and 8 outputs and additional
AS interface bus connection with 4 virtual inputs and
4 virtual outputs with dimensions of 126 x 90 x 55 mm.

LOGO! Manual
A5E00067781 01

Getting to Know LOGO!

Variants
The following different variants of LOGO! are available:
Symbol

Designation

Outputs

Typs

LOGO! 12/24RC *

4 x 230 V; 10A

Relay

LOGO! 24 *

4 x 24 V; 0,3 A

Transistor

LOGO! 24RC (AC)

4 x 230 V; 10A

Relay

LOGO! 230RC

4 x 230 V; 10A

Relay

LOGO! 12/24RCo *

4 x 230 V; 10A

Relay

LOGO! 24RCo (AC) 4 x 230 V; 10A

Relay

LOGO! 230RCo

4 x 230 V; 10A

Relay

LOGO! 12RCL

8 x 230 V; 10A

Relay

LOGO! 24L

8 x 24 V; 0.3 A

Transistor

LOGO! 24RCL

8 x 230 V; 10A

Relay

LOGO! 230RCL

8 x 230 V; 10A

Relay

LOGO! 24RCLB11

8 x 230 V; 10A

Relay

LOGO! 230RCLB11 8 x 230 V; 10A

Relay

*: Also with analog inputs

LOGO! Manual
A5E00067781 01

Getting to Know LOGO!

Certification, recognition and approval
LOGO! has to UL, CSA and FM certification.
 UL listing mark
Underwriters Laboratories (UL) to
UL 508 standard, file no. 116536
 CSA Certification Mark
Canadian Standard Association (CSA) to
standard C22.2 No. 142, file no. LR 48323
 FM approval
Factory Mutual (FM) Approval to
Standard Class Number 3611, Class I, Division 2,
Group A, B, C, D

Warning
Personal injury and material damage may be
incurred.
In potentially explosive areas, personal injury or
property damage can result if you withdraw any
connectors while the system is in operation.
Always ensure that the system is deenergized
before you disconnect LOGO! plug connections
and associated components in potentially explosive areas.
LOGO! carries CE marking, complies with the VDE 0631
and IEC1131 standards and has interference suppression
to EN 55011 (limit class B, class A for ASi bus operation).
Shipbuilding certification has been granted.
 ABS American Bureau of Shipping
 BV Bureau Veritas
 DNV Det Norske Veritas
 GL Germanischer Lloyd
 LRS Lloyds Register of Shipping
 PRS Polski Rejestr Statkw
LOGO! can therefore be used both in industry and at home.

LOGO! Manual
A5E00067781 01

Getting to Know LOGO!

Marking for Australia

SIMATIC products with the marking shown on the left meet
the requirements of the AS/NZS 2064 Standard (Class A).

LOGO! Manual
A5E00067781 01

2 Installing and Wiring LOGO!

General guidelines
You should keep to the following guidelines when you
install and wire your LOGO!:
 Ensure that you comply with all the valid and mandatory
standards when wiring your LOGO! device. You should
also heed any national and regional regulations when
installing and operating the devices. Contact the relevant authorities to find out the standards and regulations that apply in your specific case.
 Use wires with the appropriate cross-section for the
amount of current involved. You can wire LOGO! using
wires with a cross-section of between 1.5 mm2 and
2.5 mm2 (see Section 2.2).
 Dont screw the connectors too tightly. The maximum
torque is 0.5 Nm (see Section 2.2).
 Keep wiring distances as short as possible. If longer
wires are necessary, a shielded cable should be used.
You should lay wires in pairs: a neutral conductor together with a phase conductor or signal conductor.
 Isolate AC wiring and high-voltage DC wiring with rapid
operating sequences from low-voltage signal wiring.
 Ensure that the wires have the required strain relief.
 Provide suitable overvoltage protection for wires that
could be vulnerable to lightning.
 Do not connect an external power supply to an output
load parallel to a DC output. This can result in reverse
current at the output unless you have a diode or a similar block in your configuration.

LOGO! Manual
A5E00067781 01

Installing and Wiring LOGO!

Note
LOGO! must be installed and wired by a trained technician
who knows and complies with both the universally applicable engineering rules and the regulations and standards
that apply in specific cases.

LOGO! Manual
A5E00067781 01

Installing and Wiring LOGO!

2.1 Installing/Removing LOGO!

Dimensions
The dimensions of LOGO! comply with DIN 43880.
LOGO! must be snapped onto a DIN rail with a width of
35 mm to DIN EN 50022.
Width of LOGO!:
 LOGO! is 72 mm wide, which corresponds to the size of
4 modules (standard variant).
 LOGO!...RCo is 72 mm wide, which corresponds to the
size of 4 modules (standard variant).
 LOGO!...L is 126 mm wide, which corresponds to the
size of 7 modules.
 LOGO!...B11 is 126 mm wide, which corresponds to the
size of 7 modules.
Note
We will show you how to install and deinstall LOGO! with
the aid of an illustration of the LOGO! 230RC. The measures described also apply to all other LOGO! modules.

Installing
To install LOGO! on a DIN rail, proceed as follows:
1. Place LOGO! on the rail
2. Swivel it onto the rail so that the snap catch on the back
of LOGO! engages.
Depending on the type of DIN rail used, the snapping
mechanism may be a bit stiff. If it is too stiff and LOGO!
wont snap on, you can pull the snap catch down a little as
you do when deinstalling LOGO! (as described below).

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Deinstalling
To deinstall LOGO!, proceed as follows:
1. Insert a screwdriver in the hole shown in the picture at
the lower end of the snap catch, and pull the snap catch
downwards.

2
1
2. Swivel it away from the DIN rail.

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2.2 Wiring LOGO!

Use a screwdriver with a 3 mm head to wire LOGO!.
You dont need wire end ferrules for the connectors. You
can use wires up to the following sizes:
 1 x 2.5 mm2
 2 x 1.5 mm2 for each second connector compartment
Connecting torque: 0.4...0.5 Nm or 3...4 LBin
Note
Install LOGO! in a distribution box or control cabinet, ensuring that the connectors are covered. If they are not,
there is a danger of touching live parts.

2.2.1 Connecting the Power Supply

LOGO! 230 variants are suitable for line voltages with a
rating of 115 V AC and 230 V AC and LOGO! 24 variants
and 12 variants are suitable for 24 V DC and 24 V AC or
12 V DC supply voltage. Note the information on connection in the product information document shipped with your
device and the technical specifications in Appendix A relating to the permissible voltage tolerances, line frequencies
and current inputs.
Note
Power failure might result for instance in an additional
edge after power restoration with edge-triggered special
functions.

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Connecting
To connect LOGO! to the system, proceed as follows:
LOGO! 12/24...
L+
M

LOGO! 230...
L1
N

Protection by fuse
if required (recommended).
12/24 RC...:
24:
24 L:

0.8 A
2.0 A
3.0 A

Note
LOGO! has protective insulation. A ground terminal is not
necessary.

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2.2.2 Connecting LOGO!s Inputs

Prerequisites
Connect sensors to the inputs. The sensors may be pushbuttons, switches, photoelectric barriers, daylight control
switches etc.
Sensor attributesfor LOGO!
LOGO! 12/24 RC/RCo
I1 ... I6

I7, I8

LOGO! 24
I1 ... I6

I7, I8

Circuit state 0

< 5 V DC

< 5 V DC

< 5 V DC

< 5 V DC

Input current

< 1.0 mA

< 0.05 mA

< 1.0 mA

< 0.05 mA

Schaltzustand 1

> 8 V DC

> 8 V DC

> 8 V DC

> 8 V DC

Input current

> 1.5 mA

> 0.1 mA

> 1.5 mA

> 0.1 mA

LOGO! 24
RC/RCo (AC)

LOGO! 230
RC/RCo

Circuit state 0

< 5 V AC

< 40 V AC

Input current

< 1.0 mA

< 0.03 mA

Circuit state 1

> 12 V AC

> 79 V AC

Input current

> 2.5 mA

> 0.08 mA

LOGO! 12
RCL

LOGO! 24
L

LOGO! 24
RCL...

LOGO! 230
RCL...

Circuit state 0

< 4 V DC

< 5 V DC

< 5 V DC

< 40 V AC

Input current

< 0.5 mA

< 1.5 mA

< 1.5 mA

< 0.03 mA

Circuit state 1

> 8 V DC

> 12 V DC

> 12 V DC

> 79 V AC

Input current

> 1.5 mA

> 4.5 mA

> 4.5 mA

> 0.08 mA

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Sensor connections
Connecting glow lamps, 2-wire proximity switch for
LOGO! 230RC/230RCo
L1
N
Order number for C:
C
L1

Siemens
Switching Devices & Systems

3SB1430-3C
3SB1420-3D
3TX7462-3T

Circuit state change 0  1 / 1  0

When the circuit state changes from 0 to 1, circuit state 1
and, in the case of a change from 1 to 0, circuit state 0
must be in place for at least one program cycle for LOGO!
to recognize the new circuit state.
The cycle time of the program processing depends on the
size of the program.
In the appendix you can find a description of a short test
program that will help you to work out the current cycle
time.
Fast inputs
LOGO! (apart from LOGO! 230..., 24 RC and 24 RCo) also
has inputs for frequency functions. The same restrictions
do not apply to these fast inputs. The fast inputs are the
last two inputs on a LOGO!:
 LOGO! Standard variant: inputs I5/I6
 LOGO!...L variant: inputs I11/I12

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Analog inputs
In the case of LOGO!24, LOGO!12/24RC and
LOGO!12/24RCo, the inputs I7 and I8 can be used as normal digital inputs or as analog inputs. How the input is used
depends on its purpose in the LOGO! control program. You
can use the digital capability of the input with I7/I8 and its
analog capability with the identifiers AI1 and AI2.
See also Section 4.1.
Note
Always use twisted wires for analog signals, and keep
them as short as possible

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Sensor connections
To connect the sensors to LOGO!, proceed as follows:
LOGO! 12/24 ...
L+
M

The inputs of LOGO! 12/24... are

non-isolated and therefore require
the same reference potential
(ground) as the power supply.
You can also pick up analog signals
between the power supply and
ground.

LOGO! 230 ... (standard variant)

L1
N

Warning

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Existing safety regulations (VDE 0110, ... and

IEC 1131, ..., as well as UL and CSA) prohibit
the connection of different phases to the inputs
of LOGO! 230.

17

Installing and Wiring LOGO!

LOGO! ...L...
L3
L2
L1
N

18

The inputs of LOGO!

...L.. are grouped in
groups of 4 inputs.
The same applies to
these groups as for
the individual inputs of
a standard LOGO!.
Different phases are
possible only between
the blocks.

Warning
Existing safety regulations (VDE 0110, ... and
IEC 1131, ..., as well as UL and CSA) prohibit
the connection of different phases to one input
block of LOGO! ...L...

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2.2.3 Connecting Outputs

LOGO! ...R...
The outputs of LOGO! ...R... are relays. The contacts of
the relays are isolated from the power supply and from the
inputs.
Prerequisites for relay outputs
You can connect different loads to the outputs such as
lamps, fluorescent tubes, motors, contactors etc. The loads
connected to LOGO! ...R... must have the following properties:
 The maximum switched current depends on the type of
load and the number of operations. You will find more
information on this in the technical specifications.
 When switched on (Q = 1), the maximum current is
10 amperes (8 A at 230 V AC) for a non-inductive load
and 3 amperes (2 A at 12/24 V AC/DC) for an inductive
load.
Connecting
To connect the load to LOGO! ...R...variants, proceed as
follows:

Load

Load

Load

Protection with automatic circuit breaker (max. 16 A, B16, e.g. power circuit
breaker 5SX2 116-6 (if desired)

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LOGO! with transistor outputs
LOGO! variants with transistor outputs can be identified by
the fact that the letter R is missing from their type designation. The outputs are short circuit-proof and overload-proof.
A separate voltage supply to the load is not necessary
since LOGO! supplies the load with voltage.
Prerequisites for transistor outputs
The load connected to LOGO! must have the following
properties:
 The maximum switched current is 0.3 amperes per output.
Connecting
To connect the load to LOGO! with transistor outputs, proceed as follows:
LOGO! 24

Load

LOGO! 24L

Load

Load

Load: 24 V DC, 0.3 A max.

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2.2.4 Connecting the ASi Bus (LOGO! ...B11 Only)

This section will be of interest to you if you want
to connect LOGO!..B11 to the ASi bus.
LOGO!...B11
LOGO!...B11 can be integrated into a network as an ASi
slave. Using a two-wire lead you can then do the following:
 Read in and process 4 additional inputs via the ASi bus.
 Operate 4 additional outputs on one overlaid master of
the ASi bus.
Configure LOGO!...B11 in the ASi bus by means of the ASi
master you are using.
Prerequisites for operation on an ASi master
Please note: LOGO! ...B11 must be registered in the ASi
system (e.g. LOGO! is assigned an address by the bus
master). Please read Section 2.2.5 to find out how to do
this with LOGO!..

Caution
The ASi address can be changed at least
10 times for all LOGO! ..LB11 variants.
Additional changes are not guaranteed.

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Connecting
Connect the bus connection cable to the connector provided or to a connector permitted by the system. Make
sure that the polarity is correct.
Then push the wired connector into the interface marked
AS interface.
- +

LOGO!...B11
L1
L2

LOGO!

AS interface

2.2.5 LOGO!...B11 on the ASi Bus

LOGO!...B11 must be known to the bus master if you are
to be able to use the ASi functionality. This takes places
automatically when you connect LOGO!...B11 to the bus
lead. The master detects the address of the slave.
In the case of LOGO!...B1, the address preset at the factory = 0. The master assigns a new address that is not
equal to 0.
If there are no address conflicts in the system or if only one
slave with the address 0 is connected, you do not have to
take any further steps.

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Note
If you are connecting several slave assemblies (e.g.
LOGO!...B11) to the bus at the same time, please read
Appendix E.

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2.3 Switching LOGO! On/Resumption of

Power Supply
LOGO! does not have a power switch. How LOGO! responds when switched on, depends on the following:
 Whether a program is stored in LOGO!.
 Whether a program module is connected.
 Whether it is a LOGO! variant without a display
(LOGO!...RCo).
 The state LOGO! was in before power off.
The table indicates LOGO!s response to the possible situations:
After power on

Before power off

or

No Program

No program in
memory

No Program

(empty)
>Program..
PC/Card..
Start

(with program)

or
I:123456
Mo 09:00
B03:Par
Par = 0300
Q:1234 RUN

Q:1234 RUN

I:123456
Mo 09:00

LOGO! in RUN

Program in
memory

Q:1234 RUN

or

>Program..
PC/Card..
Start

With stored program from

LOGO!

>Program..
PC/Card..
Start

With program
copied from module to LOGO!

(empty)

(with program)

24

With program
copied from
module to
LOGO!

(with program)

B01
Q1

With stored program from

LOGO!

(empty)

Cnt = 0028

&

I:123456
Mo 09:00

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Try to remember the 4 simple rules for starting LOGO!:
1. If there is no program in LOGO! or on the connected
program module, LOGO! (with display) displays the
message: No Program.
2. If there is a program on the program module, it is automatically copied to LOGO!. If there is already a program
in LOGO!, it is overwritten
3. If there is a program in LOGO! or on the program module, LOGO! adopts the operating status it had before
power off. If you are using a variant without display
(LOGO! ...RCo), it automatically changes from STOP to
RUN (the LED changes from red to green).
4. If you have switched on retentivity for at least one function or are using a function with retentivity permanently
switched on, its current values are retained at power off.
Note
If a power failure occurs while you are entering a program,
you will find when the power is restored that LOGO! no
longer contains the program.
You should therefore save your original program before
changing it on a program module (card) or on a computer
(LOGO!Soft Comfort).

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LOGO! operating modes
LOGO! has 2 operating modes: STOP and RUN
STOP

 Display: No Program
(not LOGO! ...RCo)

 Switch LOGO! to programming mode

 The LED lights up red

(LOGO! ...RCo only)

RUN

 Display: Mask for monitoring the inputs and outputs

(after START in the main
menu)
(not LOGO! ...RCo)

 Switch LOGO! to parameterization mode

(not LOGO! ...RCo)

 The LED lights up green

(LOGO! ...RCo only)
Action by LOGO!:

Action by LOGO!:

 The inputs are not read.

 The program is not exe-

 LOGO! reads the state of

cuted.

 The relay contacts are always open or the transistor

outputs are switched off.

the inputs.

 LOGO! calculates the state

of the outputs with the program.

 LOGO! switches the relays/

transistor outputs on or off.

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3 Programming LOGO!
The first steps with LOGO!
By programming we mean entering a circuit. A LOGO! program is really no more than a circuit diagram represented
in a different way.
We have changed the way it is represented to suit
LOGO!s display panel. In this chapter we will show you
how to use LOGO! to turn your applications into LOGO!
programs.
Note
The LOGO! variants without a display
LOGO! 12/24RCo, LOGO! 24RCo and LOGO! 230RCo
do not have an operating unit. They are mainly intended
for serial applications in small machine and apparatus
construction.
LOGO!...RCo variants are not programmed on the device.
Programs from LOGO! software or from memory modules
of other LOGO! devices are transferred into the device.
In the first section of the chapter a brief example will help
you get to know how to use LOGO!.
 We will begin by introducing the two basic terms connector and block and showing you what is meant by
them.
 In a second step we will develop a program from a simple, conventional circuit.
 In the third step you can then enter this program directly
into LOGO!.
After reading through only the first few pages of this
manual, you will already have stored your first executable
program in LOGO!. Using suitable hardware (switches etc.)
you will then be able to carry out your first tests.

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3.1 Connectors
LOGO! has inputs and outputs:
4 inputs and
4 outputs via an ASi bus

Inputs

L1 N

I1 I2 I3 I4 I5 I6 I7 I8

SIEMENS

Q1

L1 N

I1 I2 I3 I4

I5 I6 I7 I8

I9 I10 I11 I12

AS interface

SIEMENS

Q2

Q3

Q4

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Outputs

Each input is identified by the letter I and a number. When

you look at LOGO! from the front, you can see the connectors for the inputs at the top.
Each output is identified by the letter Q and a number. You
can see the connectors of the outputs in the figure below.
Note
Inputs and outputs that are made available with
LOGO!...B11 by means of the AS interface bus connection
are physical inputs on LOGO! itself.
Note that it is the bus master that defines the input and
output devices on the ASi bus.

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LOGO!s connectors
The term connector refers to all connections and states in
LOGO!.
The inputs and outputs can have the state 0 or 1. 0
means there is no voltage at the input; 1 means that there
is. But that is unlikely to be new to you.
We introduced the connectors hi, lo and x, in order to facilitate program entry for you. hi (high) has the fixed state 1
and lo (low) has the fixed state 0.
If you dont want to wire an input on a block, use the x
connector. You can find out what a block is on the next
page.
LOGO! recognizes the following connectors:
Connectors
Inputs

I1... I6I,

I1...I12

I7 (AI1),
I8 (AI2)
Outputs

Q1...Q4

I1...I12 and
Ia1...Ia4
(AS interface)

Q1...Q8

Q1...Q8 and
Qa1...Qa4
(AS interface)

lo

Signal with level 0 (off)

hi

Signal with level 1 (on)

An existing connection that is not used

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3.2 Blocks and Block Numbers

In this chapter, we will describe how you can create extensive circuits with the aid of LOGO!s elements and how the
blocks are linked to each other and to the inputs and outputs.
For this purpose, please turn to Section 3.3. There we describe how to turn a conventional circuit into a LOGO! program.
Blocks
A block in LOGO! is a function which converts input information into output information. With earlier variants of
LOGO! you had to wire up the individual elements in the
control cabinet or terminal box.
When you program LOGO! you connect connectors with
blocks. To do this, simply select the connection you require
from the Co menu (Co stands for connector).
Logic operations
The simplest blocks are logic operations:
 AND
 OR
 ...
I1
I2
x

1
Q

Inputs I1 and I2 are connected to the

OR block. The last input of the block
is not used and is therefore marked
with an x.

We have made the special functions far more powerful

than before:
 Current impulse relay
 Counter
 On delay
 ....
Chapter 4 provides a complete list of LOGO!s functions.

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Displaying a block in LOGO!
The figure below shows a typical LOGO! display. As you
can see only block can be shown at a time. We have therefore introduced block numbers to help you to check how
the circuit is structured.
Display image of LOGO!
This shows that a
further block is
connected

B01

1
Input

Block number
assigned by
LOGO!

B02
I2
x

Q1

Connection is not required

Output

Block

Assigning a block number

Whenever you insert a block in a program, LOGO! assigns
that block a number.
LOGO! uses the block number to indicate the connections
between the blocks. The block numbers are therefore
chiefly meant to help you find your way around the program.
Block number

B02
I1
I2
I3

1
B01

There is a connection between

these blocks

B03
I4
I5
I6

B01

1
B01

B02
B03
x

1
Q1

B01 Q1

Move around the program using the key

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The overview display shows you three displays of LOGO!,
which together make up the program. As you can see
LOGO! links the blocks with one another by means of the
block numbers.
Advantages of the block numbers
You can connect almost any block to an input of the current
block using its block number. In this way you can use the
interim results of logic or other operations more than once.
This saves you the work required to enter things again as
well as memory space, and ensures that your circuit remains clear. In this case you have to know how LOGO! has
named the blocks.
Note
To make working with LOGO! particularly efficient, we recommend that you draw up a diagram overview of the program. This will make it easier to create the program. You
can then enter the block numbers assigned by LOGO! in
this diagram.
If you use the LOGO!Soft software to program LOGO!,
you can display and print out a ladder program. You can
create a functional block diagram of your program straight
away using LOGO!Soft Comfort.

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3.3 From the Circuit Diagram to LOGO!

How a circuit is represented in a circuit diagram
You know, of course, how a circuit is represented in a circuit diagram. Here is an example:

S1

S2

The consumer E1 is switched

on and off by means of the
switches (S1 OR S2) AND S3.
(ODER=OR; UND=AND)

K1

The relay K1 picks up, when

S1 or S2 and also S3 are
closed.

S3
K1

E1

Implementing a circuit with LOGO!

You create a circuit In LOGO! by connecting blocks and
connectors to each other:
Wiring of the inputs
S1 ... S3

Program in LOGO!

I1
I2
x

1

I3

&
Q1

Wiring of the outputs

To implement a circuit in LOGO!, begin at the output of the

circuit.
The output is the load or the relay that is supposed to operate.

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Programming LOGO!
You convert the circuit to blocks. To do this, go through the
circuit from the output to the input:
Step1: At output Q1 there is a series connection of the normally open contact S3 with another circuit component. The
series connection corresponds to an AND block:
&

I3

Q1
x
Step 2: S1 and S2 are connected in parallel. The parallel
connection corresponds to an OR block:
I1
I2
x

1

I3

&
Q1

You have now provided a complete description of the circuit

for LOGO!. You now need to connect the inputs and outputs to LOGO!.
Wiring
Connect switches S1 to S3 to the screw connectors of
LOGO!:
 Connect S1 to connector I1 on LOGO!
 Connect S2 to connector I2 on LOGO!
 Connect S3 to connector I3 on LOGO!
Only 2 inputs of the OR block are used so the third input
must be marked as unused. This is indicated by the x next
to it.
Likewise, only 2 inputs of the AND block are used. The
third input is therefore also marked as unused by an x
next to it.
The output of the AND block controls the relay at output
Q1. Consumer E1 is connected at output Q1.

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Wiring example
The following table shows you the wiring based on a 230 V
variant of LOGO!.
L1

Wiring of the inputs

N
S S S
1 2 3

Wiring of the outputs

L1

Load

Load

Wiring of the outputs of a LOGO...L...

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3.4 The 4 Golden Rules for Working with

LOGO!
Rule 1
3-finger grip
 Enter the circuit in programming mode. Switch to programming mode by pressing the 3 keys , and OK at
the same time.
 Change the values of times and parameters in parameterization mode. Switch to parameterization mode by
pressing the 2 keys ESC and OK at the same time.
Rule 2
Outputs and inputs
 Always enter a circuit from output to input.
 You can connect an output to several inputs, but not
several outputs to one input.
 You cant connect an output to a preceding input within
a program path. Insert markers or outputs in such cases
(recursions).

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Rule 3
Cursor and cursor movement
The following applies when entering a circuit:
 When the cursor appears in the form of an underscore,
you can move the cursor:
Use the keys , , or to move the cursor in the
circuit.
Press OK to select a connector/block.
Press ESC to exit circuit input.
 When the cursor appears in the form of a solid block,
you should select a connector/block
Use the keys or to select a connector/block.
Press OK to accept a selection.
Press ESC to go back one step.
Rule 4
Planning

 Before you enter a circuit, draw up a complete plan of it

on paper or program LOGO! directly using LOGO!Soft
or LOGO!Soft Comfort.
 LOGO! can only store complete programs. If you enter
an incomplete program, LOGO! is not able to exit
Programming mode.

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3.5 Overview of LOGO!s menus

Programming mode

Main menu

>Program..
PC/Card..
Start

Programming menu

OK
ESC

OK

>Edit Prg
Clear Prg
Set Clock
ASi_BUS..

ESC
PC/card menu

= LOGO!

>PC

Card
Card

Parameterization mode

Parameterization menu

>Set Clock
Set Param

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3.6 Entering and Starting a Program

You have designed a circuit and now want to enter it in
LOGO!. The example below illustrates how to do this.

3.6.1 Switching to Programming Mode

Connect LOGO! to the mains and switch on the power. The
following message appears on the display:

No Program

Switch LOGO! to programming mode To do this, press the

keys , and OK at the same time. The fact that you have
to press the keys simultaneously prevents anyone pressing
them and switching to programming mode inadvertently.

No Program

When you press the keys, LOGO!s main menu appears:

>Program..
PC/Card..
Start

LOGO!s main menu

On the left in the first line you will see >. Use the keys
and to move the > up and down. Move the > to
Program.. and press OK. LOGO! switches to the programming menu.

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Programming LOGO!

>Edit Prg
Clear Prg
Set Clock
ASi_BUS..

LOGO!s programming menu

The ASi bus entry only appears
with LOGO!...LB11 variants

Here too, you can move the > by pressing the and
keys. Position the > on Edit Prg (i.e. to enter the program) and press OK. LOGO! then displays the first output:
LOGO!s first output

Q1
Use the keys and keys to select the other outputs. At
this point, you begin to enter your circuit.

3.6.2 First Program

Lets have a look at the following circuit: a parallel connection of two switches.
Circuit diagram
How a circuit is represented in a circuit diagram
S1

S2

K1

K1
E1

40

The consumer is switched on

by switch S1 or switch S2. As
far as LOGO! is concerned,
the parallel connection of the
switches is an OR block because S1 or S2 switches the
output on.

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Translated into the LOGO! program, this means: Relay K1
(in LOGO! via output Q1) is controlled by an OR block.
Program
I1 and I2 are connected to the input of the OR block, S1 to
I1 and S2 to I2.
Thus, the program in LOGO! looks like this:
I1

1

I2

Q1

Wiring
The wiring is as follows:
L1
N
S1
L1

S2
I1

I2

I3

I4

I5

I6

SIEMENS

Q1

Q2

Q3

Q4

Switch S1 acts on input I1 and switch S2 on input I2. The

consumer is connected to relay Q1.

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3.6.3 Entering a Program

Lets enter the program now (from the output to the input).
Initially, LOGO! displays the output:
LOGO!s first output

Q1
The Q of Q1 is underlined. This underlining is the cursor.
The cursor indicates your current position in the program.
You can move the cursor by pressing the , , and
keys. Now press the key . The cursor moves to the left.
The cursor indicates your position in
the program.

Q1

At this point, enter only the first block (the OR block). Press
OK to switch to input mode.
The cursor appears in the form of a
solid block: you can select a connector
or block.

Co

Q1

The cursor no longer appears in the form of an underline;

instead it appears as a solid block that flashes on and off.
At the same time, LOGO! offers you the first list for selection.
Select the BF list (by pressing until BF appears) and
press OK. LOGO! then displays the first block in the list of
basic functions (BF):

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B01
&
Q1
Now press the key
the display:

The first block in the list of basic functions is AND. The cursor appears in
the form of a solid block, indicating that
you have to select a block.

or , until the OR block appears in

B01
1

The cursor is still in the block and appears in the form of a solid block.

Q1
Press OK to conclude your selection.
The following appears in the display panel

B01

1

Block
number

Q1

Your entire program looks

like this
B01

1
Q1

You have now entered the first block. Each block you enter
receives a number, the block number. All you have to do
now is wire the inputs of the block. To do this, proceed as
follows:
Press OK.
The following appears in the display panel

B01
Co 1

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43

Programming LOGO!
Select the Co list: Press OK
The following appears in the display panel

B01
x

1
Q1

The first item in the Co list is the character for indicating

that the input is not use, an x. Use the or key to select input I1.

B01
I1 1

Q1

Press OK: I1 is connected to the input of the OR block.

The cursor jumps to the next input of the OR block.
The following appears in the display panel

B01
I1

1
Q1

Your entire program so far

looks like this in LOGO!
B01

I1

1
Q1

Now connect input I2 to the input of the OR block. You

know how to do this already:
1. Switch to input mode:
OK
2. Select the Co list:
keys or
3. Accept the Co list:
OK
4. Select I2:
keys or
5. Accept I2:
OK
Thus, I2 is now connected to the input of the OR block:

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The following appears in the display panel

B01
I1
I2

1
Q1

Your entire program so far

looks like this in LOGO!
B01

I1

1
Q1

I2

We dont need the last input of the OR block in this program. In a LOGO! program, you mark an input that is not
used with an x, so now enter the x (you know the principle already):
1. Switch to input mode:
OK
2. Select the Co list:
keys or
3. Accept the Co list:
OK
4. Select x:
keys or
5. Accept x:
OK
Thus, all the blocks inputs are now wired. As far as LOGO!
is concerned, the program is now complete. LOGO! returns
to output Q1.
The following appears in the display panel
Your program looks like this
B01

B01

Q1

I1
I2
x

1
Q1

If you want to have another look at your first program, you

can use the or key to move the cursor through the program.

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Programming LOGO!
But we are going to exit program input now. To do this, proceed as follows:
1. Return to the programming menu:
ESC
If this doesnt return you to the programming menu, you
have not wired a block completely. LOGO! displays the
point in the program at which you forgot something (LOGO!
only accepts completed programs, which is very much in
your interests). Also refer to page 57.
Note
LOGO! has now stored your program permanently, so that
it will not be lost in the event of a power failure. The program is stored in LOGO! until you expressly delete it by
entering the appropriate command.
2. Return to the main menu:

ESC

Switching LOGO! to RUN

3. Move > to Start:
keys or
4. Accept Start:
OK
LOGO! switches to RUN. In RUN LOGO! displays the following:
LOGO!s display panel in RUN

I:123456
Mo 09:00
Q:1234 RUN

State of the inputs

Current time
(variants with time switch only)
LOGO! is in RUN

I:12345678
9 10 11 12
Mo 09:00
Q:12345678

State of the outputs

State of the ASi inputs
State of the ASi outputs
State of the ASi bus

46

ASi_Bus
Ia : 1234
Qa : 1234
Bus: On

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What does LOGO! is in RUN? mean?
In RUN, LOGO! executes the program. First of all it reads
the states of the inputs, uses the program you have specified to determine the states of the outputs, and switches
the relays at the outputs on or off.
LOGO! represents the state of an input or output as follows:

I:123456
Mo 09:00

Input/output has the state 1:

inverse

Q:1234 RUN

Input/output has the state

0: not inverse

I:12345678
9 10 11 12
Mo 09:00
Q:12345678

State display
Lets have a look at that in our example:
L1
S1

S2

=1
I1

When switch S1 is closed,

voltage is applied to input I1,
which has the state 1.

I2
LOGO! calculates the states
of the outputs with the program.

I:123456
Mo 09:00

Output Q1 has the state 1

here.

Q:1234 RUN
Q1

When Q1 has the state 1,

LOGO! operates relay Q1
and the consumer at Q1 is
supplied with voltage.

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Programming LOGO!
The next step
You have now successfully entered your first circuit.
In the next section, we will show you how to make changes
to existing programs and use special functions in them.

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3.6.4 Second Program

We will use the second program to show you the following:
 How to insert a block in an existing program.
 How to select a block for a special function.
 How to enter parameters.
Changing circuits
In order to produce the second program, we have to modify
the first one slightly.
Lets begin by looking at the circuit diagram for the second
program:
L1
S1

You already know the first part of

the circuit. Switches S1 and S2 operate a relay. This relay switches on
consumer E1 and switches it off after a delay of 12 minutes.

K1

S2

E1

K1
N

In LOGO! the program looks like this:

I1
I2
x

1

This is the
additional new
block
x
T

Q1

You will recognize the OR block and output relay Q1 from

the first program. Only the off delay is new.

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Programming LOGO!
Editing a program
Switch LOGO! to programming mode
To do this, proceed as follows:
1. Switch LOGO! to programming mode:
( , and OK at the same time).
2. Select Program.. from the main menu
(by moving > to Program.. and press OK)
3. Select Edit Prg.. from the programming menu
(by moving > to Edit Prg.. and press OK)
You can now modify the existing program.
Inserting an additional block in a program
Move the cursor to the B of B01 (B01 is the block number
of the OR block).
Move the cursor:
Press

B01

Q1

At this point we insert the new block. Press OK.

LOGO! displays the BN list.

BN

Q1

Select the SF list ( key).

The SF list contains the blocks
for the special functions.

SF

Q1

Press OK.

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The block of the first special function appears:

Trg
T

Q1

When you select a block for a special or basic

function, LOGO! displays the block of the
function. The cursor is in the block and appears in the form of a solid block. Use the 
or  key to select the block you want.

Select the desired block (off delay, see next diagram) and
press OK:

B02
B01
R
T

Q1

The inserted block receives the block number B02. Block B01, which has been connected up to now to Q1, is automatically
connected to the uppermost input of the inserted block. The cursor is positioned at the
uppermost input of the inserted block.

The off-delay block has 3 inputs. The uppermost input is

the trigger input (Trg). Use this input to start the off delay.
In our example, the off delay is started by the OR block
B01. Reset the time and outputs using the reset input and
set the time for the off delay using the T parameter.
In our example, we dont use the reset input of the off
delay. We wire it with x. You learned how to do this in the
first program, but just to remind you, here is the procedure
again:
1. Position the cursor under the R:key or
2. Switch to input mode:
OK
3. Select the Co list:
keys or
4. Accept the Co list:
OK
5. Select x:
keys or
6. Accept x:
OK

B02
B01
x
T

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The display should now look like this:

Q1

51

Programming LOGO!
Parameterizing a block
Now enter the time T for the off delay:
1. If the cursor is not yet under the T,
move it there:
keys or
2. Switch to input mode:
OK
LOGO! displays the parameter window for parameters:

B02:T
T=00.00s+
Time value

B02: the parameter of block

B02 T: is a time
+ Means: the parameter is
displayed in parameterization mode and can be modified there
Time unit

The cursor appears on the first position of the time value.

To change the time value, proceed as follows:
 Use the keys and to move the cursor to different
positions.
 Use the keys and to change the value.
 When you have entered the time value, press OK.
Setting the time
Set the time T = 12:00 minutes:
1. Move the cursor to the first position:
or
2. Select 1:
or
3. Move the cursor to the second position:
or
4. Select 2:
or
5. Move the cursor to the unit:
or
6. Select the unit m for minutes:
or

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Displaying/hiding parameters type of protection
If you dont want the parameter to be displayed in parameterization mode, proceed as follows:
7. Move the cursor to the protection mode::
or
8. Select protection mode :
or
The following message should now appear on the display:

B02:T
T=12:00m+
Type of protection+: Time
T can be changed in parameterization mode

or

B02:T
T = 12:00m
Type of protection: Time
T cannot be changed in
parameterization mode

9. Conclude your input:

OK
Checking the program
This branch of the program for Q1 is now complete.
LOGO! displays the Q1 output. You can have another look
at the program on the display. Use the keys to move
through the program. Use or to move from block to
block and use and to move between the inputs on a
block.
Exiting programming mode
Exit program input in the same way you did for the first program, but just remind you, here is the procedure again:
1. Return to the programming menu:
ESC
2. Return to the main menu:
ESC
3. Move > to Start:
keys or
4. Accept Start:
OK

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Programming LOGO!
LOGO! is now in RUN again:

I:123456
Mo 09:00
Q:1234 RUN

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3.6.5 Deleting a Block

Lets suppose you want to delete block B02 from the following program and connect B01 directly with Q1.
B01
B02
I1
I2
x

x
T

Q1

To do this, proceed as follows:

1. Switch LOGO! to programming mode (3-finger grip).
2. Select Edit Prg by pressing OK.
3. Position the cursor at the input of Q1, i.e. under B02
using the key :

B02

Q1

4. Press OK.
5. Connect block B01 instead of block B02 directly to output Q1:
Select the BN list and press OK
Select B01 and press OK.
Result: Block B02 is now deleted, because it is no longer
used anywhere within the entire circuit. Block B01 is now
connected directly to the output instead of B02.

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3.6.6 Deleting a Number of Interconnected Blocks

Lets suppose you want to delete blocks B01 and B02 from
the following program.
B01
B02
I1
I2
x

x
T

Q1

To do this, proceed as follows:

1. Switch LOGO! to programming mode (3-finger grip).
2. Select Edit Prg by pressing OK.
3. Position the cursor at the input of Q1, i.e. under B02:

B02

Q1

4. Press OK.
5. Set the connector x instead of block B02 at the Q1 output:
Select the Co list and then press OK.
Select x and then press OK.
Result: Block B02 is now deleted, because it is no longer
used anywhere within the entire circuit. and all the blocks
that are connected to it are deleted (i.e. block B01 in the
example).

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3.6.7 Correcting Typing Errors

It is easy to correct typing errors in LOGO!:
 If you have not yet concluded input, you can use ESC
to go back a step.
 If you have already concluded input, simply start again,
as follows:
1. Move the cursor to the location of the error.
2. Switch to input mode: OK
3. Enter the correct wiring for the input.
You can only replace one block with another if the new
block has exactly the same number of inputs as the old
one. However, you can delete the old block and insert a
new one. You can insert whichever block you like.

3.6.8 ? on the Display

If you have entered a program and want to exit Edit Prg
with ESC, LOGO! checks whether you have wired all the
inputs of all the blocks correctly. If you have forgotten an
input or parameter, LOGO! displays the first place at which
you have forgotten something and marks with a question
mark all those inputs and parameters that have not been
wired.
You have not yet wired the input here
You have not yet specified a
value for the parameter

B02
B01
R ?
T ?

Q1

Wire the input and enter a value for the parameter. You can
then exit Edit Prg by pressing ESC.

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3.6.9 Deleting a Program

To delete a program, proceed as follows:
1. Switch LOGO! to programming mode:
, and OK at the same time

>Program..
PC/Card..
Start
2. Move the > with the keys
press OK

>Edit Prg
Clear Prg
Set Clock

or

to Program.. and

LOGO! switches to the programming

menu.

3. Move the > to Clear Prg:

or
4. Accept Clear Prg:
OK

Clear Prg
>No
Yes

To prevent you from inadvertently deleting the program, we have included an

additional query.

If you do not want to delete the program, leave the > on

No and press OK.
If you are sure that you want to delete the program stored
in LOGO!, proceed as follows:
5. Move the > to Yes:
or
6. Press OK. LOGO! deletes the program.

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3.7 Storage Space and Size of a Circuit

A program (control program in LOGO!, circuit diagram) has
the following limitations:
 The number of blocks connected in series (nesting
depth)
 The storage space (use of memory by the blocks)
Memory area
You can only use a limited number of blocks for your program in LOGO!. In addition, some blocks require extra
memory for their special functions.
The memory required for special functions is divided up
into 4 memory areas.
 Par: The area in which LOGO! stores the desired values (e.g. the limit values of a counter).
 RAM: The area in which LOGO! stores the current actual values (e.g. the counter status).
 Timer: The area LOGO! uses for time functions such as
the off delay.
 REM: The area in which LOGO! stores actual values
that have to be retained (e.g. the count value of an operating hours counter). In blocks with selective use of
the retentive feature, this memory area is only used if
the retentive feature is switched on.
Resources available in LOGO!
The maximum amount of resources that can be occupied
by a program in LOGO! is as follows:
Blocks
56

Par
48

RAM
27

Timer
16

REM
15

Markers
8

LOGO! monitors memory utilization, and offers in the function lists only those functions for which there is still actually
enough memory space available.

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Memory utilization
The table gives you an overview of the special memory
requirements of the special functions:
Function block

60

Par

RAM

Timer

REM

Latching relay*

(1)

(1)

Current impulse relay*

(1)

(1)

Interval time-delay relay

Edge-triggered interval
time-delay relay

On delay

Off delay

On/off delay

Retentive
on delay

Seven-day time switch

Twelve-month time switch

Up/down counter*

(2)

(2)

Operating hours counter

Symmetrical clock pulse generator

Asynchronous pulse generator

Random generator

Frequency
trigger

Analog trigger

Analog comparator

Stairwell light switch

Dual-function switch

Message texts

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* Depending on the parameterization of the function with or
without retentivity, each function occupies the following
amount of memory:
 Retentivity switched off: RAM memory
 Retentivity switched on: REM memory
The maximum number of functions that can be used
Based on the memory requirements of the individual
special functions, you can work out the maximum
number of special functions you can use.
Example: The operating hours counter requires 2 memory
areas for desired value storage (Par) and 4 memory areas
for the actual values that have to be retained (REM). There
are 15 REM memory areas and 48 Par memory areas In
LOGO!.
The special function of the operating hours counter can
therefore only be used a maximum of 3 times, leaving just
3 REM memory areas left. Although there are still 42 Par
memory areas free, you are one REM memory area short
to run an additional operating hours counter.
Calculation: Free memory areas divided by the required
number of memory areas. Carry out this calculation for
each memory area required (Par, RAM, timer, REM). The
lowest value shows you the maximum number of functions
you can use.
Nesting depth
A program path consists of a series of function blocks
starting and ending with a terminal block. The number of
blocks in a program path describes the nesting depth.
Inputs and levels (I, Ia, hi, lo), as well as outputs and markers (Q, Qa, M) are terminal blocks . The terminal blocks
are not represented by a block symbol in LOGO!.
The maximum number of function blocks you can use in
LOGO! is 56, so the maximum nesting depth is:
56 function blocks + 2 terminal blocks = 58.

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4 LOGO! Functions
Element lists
LOGO! offers you a number of elements in programming
mode. So that you dont lose track of things, we have divided these elements into lists. These lists are:
 Co: List of connectors (Connector)
(see Section 4.1)
 BF: List of the basic functions AND, OR, ...
(see Section 4.2)
 SF: List of special functions
(see Section 4.4)
 BN: List of the completed and reusable blocks in the
circuit
Contents of the lists
All the lists display elements available in LOGO!. Normally,
these are all the connectors, all the basic functions and all
the special functions that the respective LOGO! variant
knows. These elements also include all the blocks you
have created in LOGO! before you call up the BN list.
When LOGO! no longer displays everything
LOGO! no longer displays all elements if:
 No further block must be inserted.
In this case, there is either no more memory available
or the maximum number of possible blocks has been
reached (56).
 A special block would use more memory than is still
available in LOGO!.
 The resulting number of function blocks connected in
series would exceed 7 (see Section 3.7).

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4.1 Constants and Connectors Co

Constants and connectors (connectors = Co) are inputs,
outputs, memory markers and fixed voltage levels
(constants).
Inputs
Inputs are identified by the letter I. The input numbers (I1,
I2, ...) correspond to the numbers of the input connectors
on LOGO!.
Analog inputs
The LOGO! models LOGO! 24, LOGO! 12/24RC and
LOGO! 12/24RCo include the inputs I7 and I8, which can
also be used as AI1 and AI2, depending on how they are
programmed. If the inputs are used as I7 and I8, the signal
applied is interpreted as a digital value. If they are used as
AI1 and AI2, the signals are interpreted as analog values.
In the case of special functions, which can only be effectively connected with analog inputs on the input side, only
the analog inputs AI1 and AI2 are offered for selection in
programming mode when the input signal is selected.
ASi inputs
Inputs Ia1 to Ia4 are also available for communication via
the ASi bus in LOGO! variants with an AS interface connection (LOGO!...B11).
Outputs
Outputs are identified by the letter Q. The output numbers
(Q1, Q2, ...) correspond to the numbers of the output connectors on LOGO!.
Outputs Qa1 to Qa4 are also available for communication
via the ASi bus with LOGO! variants with an AS interface
connection (LOGO!...B11).

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Markers
Markers are identified by the letter M. Markers are virtual
outputs that have the same value at their output as they
have at their input. There are 8 memory markers (M1 ...
M8) available in LOGO!.
By using memory markers you can exceed the maximum
number of consecutive blocks.
Startup flags
Memory marker M8 is set in the first cycle of the user program and can be used subsequently in your program as a
startup flag. It is automatically reset after the first cycle of
program processing.
As regards setting, deletion and evaluation, memory
marker M8 can be used in the same way as memory markers M1 to M7 in all subsequent cycles.
Note
The signal applied at the markers output is always that of
the last program cycle. The signal is not changed within a
program cycle.

Levels
Voltage levels are identified by hi and lo. If a block is supposed to have the state 1 = hi or 0 = continuously, the
input is wired with the fixed level or the constant hi or lo
value.
Open connectors
If a connector pin of a block is not to be wired, this is indicated with an x.

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4.2 List of Basic Functions BF

Basic functions are simple basic operation links in Boolean
algebra.
When you enter a circuit, you will find the blocks for basic
functions in the BF list. The following basic functions exist:
Circuit diagram
representation

Representation in
LOGO!

Designation of the
basic function
AND

Series connection
of normally open
contacts

(see page 67)

AND with RLO

edge detection
(see page 67)

NAND
(AND not)
Parallel connection of normally
closed contacts

(see page 68)

NAND with RLO

edge detection
(see page 69)

OR

Parallel connection of normally

open contacts
Series connectionof normally
closed contacts

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(see page 67)

NOR
(OR not)
(see page 70)

65

LOGO! Functions
Circuit diagram
representation

Representation in
LOGO!

Designation of the
basic function
XOR
(exclusive OR)

Double changeover

(see page 71)

Inverter

NOT
(negation, inverter)
(see page 71)

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4.2.1 AND
The series connection of a number of normally open contacts is represented in a
circuit diagram as follows:

Symbol in LOGO!:

The output of the AND only adopts the state 1 if all the inputs have the state 1 (i.e. they are closed).
If an input pin of this block is not wired (x), then the following applies to the input: x = 1.
Logic table for AND
1

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

0
0
0
0
0
0
0
1

4.2.2 AND with RLO Edge Detection

Symbol in LOGO!:

The output of AND with RLO edge detection only adopts

the state 1 when all inputs have the state 1 and at least
one input had the state 0 in the previous cycle.
If an input pin of this block is not wired (x), then the following applies to the input: x = 1.

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LOGO! Functions
Timing diagram for AND with RLO edge detection
1
2
3
Q
Cycle

10

4.2.3 NAND (AND Not)

The parallel connection of a number
of normally closed contacts is represented in a circuit diagram as follows:

Symbol in LOGO!:

The output of NAND only adopts the state 0 if all the inputs
have the state 1 (i.e. they are closed).
If an input pin of this block is not wired (x), then the following applies to the input: x = 1.
Logic table for NAND

68

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

1
1
1
1
1
1
1
0

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4.2.4 NAND with RLO Edge Detection

Symbol in LOGO!:

The output of NAND with RLO edge detection only adopts

the state 1 when at least one input has the state 0 and all
inputs had the state 1 in the previous cycle.
If an input pin of this block is not wired (x), then the following applies to the input: x = 1.
Timing diagram for NAND with RLO edge detection
1
2
3
Q
Cycle

10

4.2.5 OR
The parallel connection of a number of
normally open contacts is represented
in a circuit diagram as follows:

Symbol in LOGO!:

The output of the OR adopts the state 1 if at least one input has the state 1 (i.e. it is closed).
If an input pin of this block is not wired (x), then the following applies to the input: x = 0.

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Logic table for OR:
1

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

0
1
1
1
1
1
1
1

4.2.6 NOR (OR Not)

The series connection of a number of
normally closed contacts is represented
in a circuit diagram as follows:

Symbol in LOGO!:

The output of NOR only adopts the state 1 if all the inputs
have the state 0 (i.e. they are switched off). As soon as
any of the inputs is switched on (state 1), the output of
NOR is set to 0.
If an input pin of this block is not wired (x), then the following applies to the input: x = 0.
Logic table for NOR

70

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

1
0
0
0
0
0
0
0

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4.2.7 XOR (Exclusive OR)

An XOR in a circuit diagram is a
series connection of two changeover contacts:

Symbol in LOGO!:

The output of XOR adopts the state 1 if the inputs have

different states.
If an input pin of this block is not wired (x), then the following applies to the input: x = 0.
Logic table for XOR
1

0
0
1
1

0
1
0
1

0
1
1
0

4.2.8 NOT (Negation, Inverter)

A normally closed contact is represented in a circuit diagram as follows:

Symbol in LOGO!:

The output adopts the state 1 if the input has the state 0. In
other words, NOT inverts the state at the input.
The advantage of the NOT function can be illustrated by
the following example: you no longer require normally
closed contacts for LOGO! You use a normally open contact and convert it into a normally closed contact by using
NOT.
Logic table for NOT
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4.3 Fundamentals of Special Functions

You will notice that special functions differ from basic functions on first glance because of the differences in the descriptions of their inputs are named. Special functions include time functions, retentivity and various
parameterization options to adapt the program to your individual requirements.
In this section we would like to give you a brief overview of
the input descriptions and provide you with some important
background information about special functions. The individual special functions are described in Section 4.4.

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4.3.1 Description of the Inputs

Connection inputs
The connections that can be made to other blocks or to the
inputs of the LOGO! device are described here.
 S (set):
The input S allows you to set the output to 1.
 R (reset):
The reset input R takes priority over all other inputs and
switches outputs to 0.
 Trg (trigger):
You use this input to start the execution of a function.
 Cnt (count):
This input records count pulses.
 Fre (frequency):
Frequency signals to be evaluated are applied at the
input with this description.
 Dir (direction):
You use this input to set the direction in which a counter
should count, for example.
 En (enable):
This input enables the function of the block. If the input
is at 0, other signals are ignored by the block.
 Inv (invert):
The output signal of the block is inverted when this input
is activated.
 Ral (reset all):
All internal values are reset.
Connector X at the inputs of the special functions
If you wire inputs of special functions to the x connector,
these inputs will be assigned the value 0 i.e. a low signal is
applied to the inputs.

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Parameter inputs
There some inputs at which you do not apply signals.
Instead, you parameterize the function block with certain
values.
 Par (parameter):
This input is not wired. Here you set parameters for the
block.
 T (time):
This input is not wired. Here you set times for a block.
 No (number):
This input is not wired. Here you set time bases.
 P (priority):
This input is not wired. Here you set priorities.

4.3.2

Time Response

Parameter T
With some of the special functions it is possible to parameterize a time value T. When specifying the time, note that
the values to be entered depend on the time base set:
Time Base

__

__

s (seconds)

Seconds

1/

m (minutes)

Minutes

Seconds

Hours

Minutes

h (hours)

B01:T
T=04.10h+

74

100

seconds

Setting the time T for 250 minutes:

Unit hours (h):
04.00 hours
00.10 hours
=

240 minutes
+10 minutes
250 minutes

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Note
Always specify a time T  0.10 s. For T = 0.05 s and
T = 0.00 s the time T is not defined.

Accuracy of T
All electronic components have minute differences. This
can result in deviations in the set time (T). In LOGO! the
maximum deviation is 1 %.
Example:
In 1 hour (3600 seconds) the deviation is 1 % (i.e. 36 seconds).
In 1 minute the deviation is therefore only 0.6 seconds.
Accuracy of the time switch
To make sure that this deviation doesnt result in the clock
in C variants running inaccurately, the time switch is regularly compared with a high-precision time base and adjusted accordingly.
This results in a maximum time error of 5s a day.

4.3.3 Clock Buffering

The internal clock of a LOGO! module continues to run if
there is a power failure, i.e. it has a power buffer. The duration of the reserve power is affected by the ambient temperature. At an ambient temperature of 25C the typical
power buffer is 80 hours.

4.3.4 Retentivity
The switching states and counter values can be kept retentively in the special functions. To do this, retentivity must be
switched on for the relevant function.

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4.3.5 Degree of Protection

The parameter protection setting allows you to specify
whether the parameters can be displayed and altered in
parameter assignment mode on the LOGO! module. There
are two possible settings:
+: The parameter settings are also displayed in parameter
assignment mode and can be changed.: The parameter
settings are not displayed in parameter assignment mode
and can only be changed in programming mode.

4.3.6 Gain and Offset Calculation for Analog Values

The Gain and Offset parameters allow the internal representation of an analog value to be aligned with the actual
measured value.
Parameter

Minimum

Maximum

Connector voltage (in V)

10

Internal process image

1000

Gain (in %)

1000

999

+999

Offset

A connector voltage of 0 to 10 V is mapped internally to

values of 0 to 1000. A connector voltage greater than 10 V
is also represented as 1000 in the internal process image.
You can use the Gain parameter to set a gain of 1000 % (a
factor of 10), for example.
You can use the Offset parameter to move the zero point of
the measured values.
You will find a sample application in the description of the
analog comparator special function on page 118.
For information on the analog inputs, see also Section 4.1.

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4.4 List of Special Functions SF

When you enter a program in LOGO!, you will find the
blocks for the special functions in the SF list. In the following table you will also find comparable representations from
circuit diagrams as well as an indication as to whether the
function in question has parameterizable retentivity.
Circuit
diagram
representation

Representation
in LOGO!

Description of
the special
function

Re

On delay
(see page 80)

Off delay
(see page 82)

On/off
delay
(see page 84)

R
Tr
g
K
1

K
K1
1

(see page 86)

Latching relay

R
S
K1

Retentive on
delay

K
1

Re

(see page 88)

Current impulse
relay

Re

(see page 90)

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Circuit
diagram
representation

Representation
in LOGO!

Description of
the special
function

Re

Interval time
delay relay
(see page 92)

Edge-triggered
interval time
delay relay
(see page 94)
New

Seven-day time
switch
(see page 95)

Twelve-month
time switch
(see page 100)

Up and down
counter

Re

(see page 102)

Operating hours
counter
(see page 105)

Symmetrical
clock pulse
generator
(see page 108)

Asynchronous
pulse generator
(see page 110)

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Circuit
diagram
representation

Representation
in LOGO!

Description of
the special
function

Re

Random generator
(see page 111)

Frequency
trigger
(see page 113)

Analog trigger
(see page 115)

Analog
comparator
(see page 118)

Stairwell light
switch
(see page 122)

Dual-function
switch
(see page 124)

Message texts
(see page 126)

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4.4.1

On Delay

Brief description
In the case of the on delay, the output is not switched over
until a definable time period has elapsed.
Symbol in
LOGO!:

Connection

Description

Input Trg

Use Trg (trigger) input to

start the time for the on
delay.

Parameter T

T is the time after which the

output is switched on (output signal is switched from 0
to 1).

Output Q

Q switches on after expiration of the defined time T if

Trg is still set.

Parameter T
Please note the parameter values for the T parameter in
Section 4.3.2.
Timing diagram
Trg
Q
T

The bold part of the

timing diagram appears in the on-delay
symbol.

Ta starts

Description of function
When the state at the Trg input changes from 0 to 1, the
time Ta begins to elapse (Ta is the current time in LOGO!).

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If the state at the Trg input remains 1 at least for the duration of the parameterized time T, the output is set to 1 after
the time T has elapsed (there is a delay between the input
being switched on and the output coming on).
If the state at the Trg input switches back to 0 before the
time T has elapsed, the time is reset.
The output is reset to 0 if the state at the Trg input is 0.
In the event of a power failure, the elapsed time is reset.

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4.4.2

Off Delay

Brief description
In the case of the off delay, the output is not reset until a
definable time period has elapsed.
Symbol in
LOGO!

Connection

Description

Input Trg

A negative signal edge

(change from 1 to 0) at the
input Trg (trigger) starts the
off-delay timer

Input R

The input R resets the

elapsed time for the off
delay and sets the output
to 0.

Parameter T

T is the period after which

the output is switched off
(output signal is switched
from 1 to 0).

Output Q

Q switches on when Trg

does but when Trg switches
off remains on until the
delay period T has elapsed.

Parameter T
Please note the parameter values for the T parameter in
Section 4.3.2.
Timing diagram
Trg

The bold part of the

timing diagram appears in the off-delay
symbol.

R
Q
Ta starts

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Description of function
When the state at the input Trg changes to 1, the output Q
switches to 1 immediately.
If the state at the input Trg changes from 1 to 0, the current
time Ta starts in LOGO!, and the output remains set. If Ta
reaches the values specified via T (Ta=T), the output Q is
reset to 0 (off delay).
If the Trg input switches on and off again, the time Ta starts
again.
The input R (Reset) resets the elapsed time Ta and the output before the set time delay Ta has elapsed.
In the event of a power failure, the elapsed time is reset.

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4.4.3

On/Off Delay

Brief description
In the case of the on/off delay, the output is switched
through after a programmable time and reset after a parameterizable time period has elapsed.
Symbol in
LOGO!

Connection
Input Trg

Description
A rising edge (change from
0 to 1) at the input Trg (Trigger) starts the time TH for
the on delay.
A falling edge (change from
1 to 0) starts the time TL for
the off delay.

Parameter Par

TH is the time after which

the output is switched on
(output signal is switched
from 0 to 1).
TL is the time after which the
output is switched off (output signal is switched from 1
to 0).

Output Q

Q switches on after the

parameterized time TH has
elapsed if Trg is still set, and
switches off after the time TL
has elapsed if Trg has not
been set again in the interim.

Parameters TH and TL
Note the default values for the parameters TH and TL in
Section 4.3.2.

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Timing diagram
The bold part of the
timing diagram appears in the on/off
delay symbol.

Trg
Q
T

T
TH starts
T
TL starts

Description of function
When the state at the input Trg changes from 0 to 1, the
timed period TH elapses.
If the state at the input Trg remains 1 at least for the duration of the parameterized time TH, the output is set to 1
after the time TH has elapsed (there is a delay between the
input being switched on and the output coming on).
If the state at the input Trg switches back to 0 before the
time TH has elapsed, the time is reset.
When the state at the input changes to 0 again, the timed
period TL elapses.
If the state at the input Trg remains at 0 at least for the
duration of the parameterized time TL, the output is set to 0
after the time TL has elapsed (there is a delay between the
input being switched off and the output going off).
If the state at the input Trg switches back to 1 before the
time TL has elapsed, the time is reset.
In the event of a power failure, the elapsed time is reset.

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4.4.4

Retentive On Delay

Brief description
Following an input pulse, a definable timed period starts on
expiration of which the output is set.
Symbol in
LOGO!

Connection

Description

Input Trg

Use the Trg (trigger) input to

start the time for the on
delay.

Input R

Input R resets the time for

the on delay and sets the
output to 0.

Parameter T

T is the time after which the

output is switched on (output state is switched from 0
to 1).

Output Q

Q is switched on when the

delay period T has elapsed.

Parameter T
Please refer to the note in Section 4.3.2 when specifying
the values.
Timing diagram
Trg
R
Q
Ta starts

The bold part of the timing diagram appears in the retentive on-delay
symbol.

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Description of function
When the state at the Trg input changes from 0 to 1, the
current time Ta starts. When Ta reaches the time T, output
Q is set to 1. Another switching operation at the Trg input
has no effect on Ta.
The output and the time Ta are not reset to 0, until the state
of the R input changes to 1 again.
In the event of a power failure, the elapsed time is reset.

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4.4.5

Latching Relay

Brief description
The output Q is set via the input S. The output is reset via
the input R.
Symbol in
LOGO!

Connection

Description

Input S

Input S sets the output Q

to 1.

Input R

The input R resets the output Q to 0. If S and R are

both 1 at the same time,
then the output is reset

Parameter Par

This parameter is used to

switch retentivity on or off.
Rem:
off = no retentive feature
on = the state can be stored
retentively

Output Q

Q switches on when S does

and remains on until the input R is set.

Timing diagram
R
S
Q
Switching behavior
A latching relay is a simple binary memory cell. The signal
at the output depends on the states of the inputs and the
previous state at the output. The following table illustrates
the logic once more:

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Sn

Rn

0
0
1
1

0
1
0
1

x
0
1
0

Remarks
State remains the same
Reset
Set
Reset (resetting has priority over setting)

After power failure the signal that was valid before the
power failure is set at the output if the retentive feature was
switched on.

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4.4.6

Current Impulse Relay

Brief description
The output is set and reset by a short pulse at the input.
Symbol in
LOGO!

Connection

Description

Input Trg

Use the Trg input (trigger) to

switch the output Q on and
off.

Input R

The input R resets the current impulse relay and sets

the output to 0.

Parameter Par

This parameter is used to

switch retentivity on or off.
Rem:
off = no retentive feature
on = the state can be stored
retentively

Output Q

Q switches on when Trg is

sent and remains switched
on until T expires.

Timing diagram
Trg
R

The bold part of the timing diagram appears in the current impulse relay symbol.

Description of function
Every time the state at the input Trg changes from 0 to 1,
the output Q changes its state, i.e. the output is switched
on or off.

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Use the R input to reset the current impulse relay to its initial state (i.e. the output is set to 0).
After power failure the current impulse relay is reset and
the Q output changes to 0 if you havent switched on the
retentive feature.

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4.4.7

Interval Time-Delay Relay Pulse Output

Brief description
An input signal produces a signal of definable duration at
the output.
Symbol in
LOGO!

Connection

Description

Input Trg

The input Trg (trigger) starts

the time for the interval timedelay relay.

Parameter T

T is the period after which

the output is switched off
(output signal is switched
from 1 to 0).

Output Q

Q comes on with Trg and remains on during the time Ta

and while the input is set to
1.

Parameter T
Please refer to the note on the T parameter in Section 4.3.2.
Timing diagram
The bold part of the timing diagram
appears in the interval time-delay
relay symbol.

Trg
Q
Ta starts

T has not expired completely

Description of function
When the input Trg switches to the state 1, the output Q
immediately switches to the state 1. At the same time, the
elapsed time Ta starts running; the output remains set.
If Ta reaches the value specified by means of T (Ta=T), the
output Q is reset to 0 (pulse output).

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If the state at the input Trg switches back from 1 to 0 before the specified time has elapsed, the output also immediately switches back from 1 to 0.

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4.4.8

Edge-Triggered Interval Time-Delay Relay

Brief description
An input signal produces a signal of a parameterizable
duration at the output (retriggerable).
Symbol in
LOGO!

Connection

Description

Input Trg

The input Trg (Trg stands for

trigger) starts the time for
the edge-triggered interval
time-delay relay

Parameter T

T is the period after which

the output is switched off
(output signal is switched
from 1 to 0).

Output Q

Q switches on when Trg

does but when Trg switches
off remains on until the
delay period T has elapsed.

Parameter T
Please refer to the note on the T parameter in Section 4.3.2.
Timing diagram
Trg

The bold part of the timing diagram

appears in the edge-triggered interval
time-delay relay symbol.

Q
Ta starts

Description of function
When the input Trg switches to the state 1, the output Q
immediately switches to the state 1. At the same time, the
time Ta starts running. If Ta reaches the time specified for T
(Ta=T), the output Q is reset to 0 (pulse output).
If the input Trg changes again from 0 to 1 before the set
time has elapsed (retriggering), the time Ta is reset and the
output remains on.

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4.4.9

Seven-Day Time Switch

Brief description
The output is controlled by a definable on/off date. Every
possible combination of weekdays is supported. Select the
active weekdays by hiding the inactive weekdays.
Symbol in
LOGO!

Connection

Description

Parameters
No 1, No 2
No 3

The No (cam) parameter is

used to set the on and off
times for each of the cams
of the seven-day time
switch. You specify the
times in terms of day and
time.

Output Q

Q switches on when the

parameterizable cam is
switched on.

Timing diagram (3 examples)

No

21

3
Q

Monday

No1:
No2:
No3:

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Wednesday
Friday
Sunday
Tuesday
Thursday
Saturday
Daily:
Tuesday
Saturday and Sunday

06:30 hours to 08:00 hours

03:10 hours to 04:15 hours
16:30 hours to 23:10 hours

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Description of function
Each seven-day time switch has three setting cams, each
of which can be used to configure a time window. You use
the cams to set the on and off times for the time windows.
At the on times, the seven-day time switch activates the
output if it is not already on.
At the off times, the seven-day time switch deactivates the
output if it is not already off. If you set an on time on one
cam that is the same as the off time on another cam on the
seven-day time switch, then the on and off times conflict. In
such cases, cam 3 has priority over cam 2 and cam 2 has
priority over cam 1.
Parameter assignment window
The parameter assignment window for cam no. 1, for example, is as follows:
Block B01

Cam No 1

B01:No1
D=MTWTFSS+
On =06:30
Off=08:00

Weekdays (daily)
See the section Displaying/
hiding parameters type of
protection on page53
On time (06.30 hours)
Off time (08.00 hours)

Day of the week

The letters after D= have the following meanings:
 M : Monday
(Monday)
 T : Tuesday
(Tuesday)
 W : Wednesday (Wednesday)
 T : Thursday
(Thursday)
 F : Friday
(Friday)
 S : Saturday
(Saturday)
 S : Sunday
(Sunday)

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An uppercase letter means the weekday has been selected. A means the weekday has not been selected.
Switching times
You can set any time between 00:00 and 23:59.
: means no switching on or off.
Setting the seven-day time switch
To enter the switching times, proceed as follows:
1. Position the cursor on one of the time switchs cam (No)
parameters (e.g. No1).
2. Press OK. LOGO! opens the parameter assignment
window for the cam. The cursor is positioned on the day
of the week.
3. Use the and keys to select one or more days of the
week.
4. Use the key to move the cursor to the first position for
the on time.
5. Set the on time.
Use the and keys to change the value. To move the
cursor from one position to another, use the and
keys. You can only select the value : at the first
digit (: means no switching operation).
6. Use the key to move the cursor to the first position for
the off time.
7. Set the off time (same procedure as for step 5).
8. Conclude your input by pressing OK.
The cursor is positioned at parameter No 2 (cam 2).
You can now parameterize another cam.
Note
Please refer to the technical specifications in Section 4.3.2
for information regarding the accuracy of the time switch.

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Seven-day time switch: example
The output of the seven-day time switch is to be switched
on every day from 05:30 to 07:40. In addition, the output is
also to be switched on from 03:10 to 04:15 on Tuesday and
from 16:30 to 23:10 at the weekend.
Three cams are required for this.
Here is the parameter assignment window for cams 2 and
3 from the above timing diagram.
Cam 1
Cam 1 is to switch on the output of the seven-day time
switch every day from 05:30 to 07:40.

B01:No1
D=MTWTFSS+
On =05:30
Off=07:40
Cam 2
Cam 2 is to switch on the output of the seven-day time
switch every Tuesday from 03:10 to 04:15.

B01:No2
D=T+
On =03:10
Off=04:15
Cam 3
Cam 3 is to switch on the output of the seven-day time
switch every Saturday and Sunday from 16:30 to 23:10.

B01:No3
D=SS+
On =16:30
Off=23:10

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Result

No

21

3
Q

Monday

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Friday
Sunday
Tuesday
Thursday
Saturday

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4.4.10

Twelve-Month Time Switch

Brief description
The output is controlled by a definable on/off date.
Symbol in
LOGO!

Connection

Description

Input No

Use the No parameter to set

the on and off times for the
cam of the twelve-month
time switch.

Output Q

Q switches on when the

parameterizable cam is
switched on.

Timing diagram
Feb.

Mar.

Apr.

MM.DD+
On=02.20
Off=04.03

On
Off

February 20

April 3

Description of function
At the on time, the twelve-month time switch switches the
output on and at the off time, it switches the output off. The
off date indicates the date on which the output is reset to 0.
The first value indicates the month, the second value indicates the day.

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Parameterization example
The output of a LOGO! has to be switched on every year
on March 1 and switched off on April 4, switched on again
on July 7 and switched off on November 19. For this you
require 2 twelve-month time switches each of which is configured for one of the on periods. The outputs are then
linked by an OR block.
On
B01:No
MM.DD
On=03.01
Off=04.04

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B02:No
MM.DD
On=07.07
Off=11.19

B01
1 March
4 April

B02

Off

7 July
19 November

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4.4.11 Up/Down Counter

Brief description
On receipt of an input pulse, an internal counter starts
counting either up or down, depending on the parameterization. When the definable count value is reached, the output is set. The direction of the count is set by a separate
input.
Symbol in
LOGO!

Connection

Description

Input R

The R input can be used to

reset the internal count
value and the output to
zero.

Input Cnt

The counter counts the

changes from state 0 to
state 1 at the Cnt input.
Changes from state 1 to
state 0 are not counted.
Maximum count frequency
at the input connectors: 5
Hz

Input Dir

The Dir input allows you to

specify the counting direction as follows:
Dir = 0: count up
Dir = 1: count down

Parameter Par

Lim is the count threshold

value; when the internal
counter reaches that value,
the output is set.
Rem activates retentivity

Output Q

102

Q switches on when the

count value is reached.

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Timing diagram
R
Cnt
Dir
Internal
count value
Cnt

Par
0
Q

Description of function
At each positive signal edge at the input, Cnt either increases the internal counter value by one (Dir = 0) or decreases it by one (Dir = 1).
If the internal counter value is greater than or equal to the
value specified for Par, the output Q is set to 1.
The Reset input R can be used to reset the internal counter
value and the output to 000000. As long as R=1, the output remains set to 0 and the pulses at the input Cnt are not
counted.
Par parameter setting

B03:Par
Lim=
000100+
Rem=off

Count value
See the section Displaying/
hiding parameters type of
protection on page53
Retentivity

If the internal counter value is greater than or equal to Par,

output Q is set. The counter remains the same in the case
of under or overflow.
Lim can be anything between 0 and 999999.
Rem: This parameter switches the retentive feature of the
internal Cnt counter on an off.
off = No retentive feature
on = The Cnt counter can be stored retentively
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If the retentive feature is switched on, when a power failure
occurs the counter status remains the same and this value
is used once power is restored.

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4.4.12 Operating Hours Counter

Brief description
When the input is set, a definable timed period starts running. The output is set when the defined period has
elapsed.
Symbol in
LOGO!

Connection
Input R

Description
R = 0:Hours can be counted
if Ral is not 1
Ral = 1:The counter is
stopped
The input R resets the output. The remaining period of
the service interval MN is
set to MN = MI. The previously elapsed time remains stored.

Input En

En is the monitoring input.

LOGO! measures the length
of time in which this input is
set.

Input Ral

Ral = 0: Hours can be

counted if R is not 1
Ral = 1:The counter is
stopped
The input Ral (Reset all) resets the counter and the
output, i.e.

 Output Q = 0,
 Recorded operating time
OT = 0

 Remaining period of service interval MN = MI.

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Symbol in
LOGO!

Connection

Description

Parameter Par:
MI

MI: specified service interval

in hours.
MI can be any number of
hours in the range 0 to
9999.

Output Q

If the remaining time MN = 0

(see timing diagram), the
output is set.

MI = parameterized count value

MN= remaining time
OT= total time elapsed since the last 1 signal at the
Ral input

Timing diagram
R
En
Ral
Q
MN=MI

Par:
MI=5h

MN=0

OT

1h

xR=1h

R
The counter stops counting as long as R or Ral is set
MI = Defined time period
MN = Remaining period
OT = Total elapsed time since last 1 signal at input Ral

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Description of function
The operating hours counter monitors the input En. As long
as the signal 1 is present at that input, LOGO! monitors the
elapsed time and the remaining period MN. LOGO! displays those times in parameterization mode. When the remaining period MN reaches 0, the output Q is set to 1.
The reset input R resets the output Q and the timer for the
remaining period to the specified period MI. The internal
counter OT continues to run.
The Ral reset input resets the output Q and the counter for
the remaining time to the specified value MI. The internal
counter OT is reset to 0.
You can look at the current values for MN and OT during
program execution in parameterization mode.
Limit value for OT
When you reset the hours counter with the signal R, the
accumulated time remains stored in OT. The maximum
limit for the counter OT is 99999 hours.
If the hours counter reaches that figure, no more hours are
recorded.
Par parameter setting

B03:Par
MI = 0000h+

Monitoring interval in hours

Degree of
protection

MI is the parameterizable time interval. It can be anything

between 0 and 9999.

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4.4.13 Symmetrical Clock Pulse Generator

Brief description
A clock pulse with a definable period length is output at the
output.
Symbol in
LOGO!

Connection

Description

Input En

The En input switches the

clock pulse generator on
and off.

Parameter T

T is the time for which the

output is switched on or off.

Output Q

Q switches on and off cyclically in time with the pulse

period T.

Parameter T
Please refer to the note in Section 4.3.2 when specifying
the values.
Timing diagram
En
Q

The bold part of the timing diagram appears in the symmetrical

clock pulse generator symbol.

Description of function
The parameter T specifies the length of the on and off periods. Use the En (enable) input to switch the clock pulse
generator on. The pulse generator sets the output to 1 for
the time T, then to 0 for the time T and so on until the En
input is a 0.

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Note on the relay outputs:
Relay outputs that switch under load get worn a little with
each switching operation. To find out how many switching
operations a LOGO! output can execute, refer to the Chapter entitled Technical Specifications (see Chapter A).

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4.4.14 Asynchronous Pulse Generator

Brief description
The pulse form of the output can be modified by means of
the definable pulse duration/interpulse period ratio.
Symbol in
LOGO!

Connection

Description

Input En

The En input switches the

asynchronous pulse generator on and off.

INV input

The input INV is used to invert the output signal of the

asynchronous clock pulse
generator when active.

Parameter Par

You can set the pulse duration TH and the interpulse

period TL.

Output Q

Q switches on and off cyclically with the times TH and

TL .

Timing diagram
En
Inv
Q
TH

TL

TH

TL

TH

TH

TL

Description of function
You can set the pulse duration and interpulse period using
the parameters TH (Time High) and TL (Time Low). Both
parameters have the same time base; they cannot be set
individually to different bases.
The INV input allows the output to be inverted. The input
INV only negates the output if the block is activated by EN.

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4.4.15 Random Generator

Brief description
In the case of the random generator, the output is switched
on and off again within a parameterizable time period.
Symbol in
LOGO!

Connection
Input En

Description
A rising edge (change from
0 to 1) at the En (enable) input starts the on delay time
of the random generator.
A falling edge (change from
1 to 0) starts the off delay
time of the random generator.

Parameter Par

The on delay time is set randomly between 0 s and TH.

The off delay time is set randomly between 0 s and TL.
TL must have the same
time base as TH.

Output Q

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Q switches on after the on

delay time has elapsed,if
Trg is still set, and switches
off after the off delay time
has elapsed if Trg has not
been set again in the interim.

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Parameters TH and TL
Note the default values for the parameters TH and TL in
Section 4.3.2.
Timing diagram
En

The bold part of the

timing diagram appears in the on/off
delay symbol.

T starts

TH

TL

Description of function
If the state at the input En changes from 0 to 1, a random
time (on delay time) between 0 s and TH is defined and
started. If the state at the input En remains at 1 at least for
the duration of the on delay time, the output is set to 1 after
the on delay time has elapsed.
If the state at the input En switches back to 0 before the on
delay time has elapsed, the timer is reset.
If the state at the input En changes again to 0, a random
time (off delay time) between 0 s and TL is defined and
started.
If the state at the input En remains at 0 at least for the
duration of the off delay time, the output is set to 0 after the
off delay time has elapsed.
If the state at the input En switches back to 1 before the off
delay time has elapsed, the timer is reset.
In the event of a power failure, the elapsed time is reset.

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4.4.16

Frequency Trigger

Brief description
The output is switched on or off depending on whether the
frequency at the input is between two definable limits.
Symbol in
LOGO!

Connection
Input Cnt

Description
At the Cnt input you apply
the input that supplies the
pulses to be counted.
Use

 Inputs I5/I6 or I11/I12

(LOGO!...L) for rapid
counts (not
LOGO!230..., 24RC,
24RCo):
max. 1 kHz.

 Any other input or circuit

component for lower frequencies.
Parameter Par:

SW: on threshold

SW, SW
G_T

SW: off threshold

Output Q

Q switches on or off depending on SW and SW.

G_T: time period over which

the signal pulses applied
are counted.

Timing diagram
Q
G_T
fre
fa = 6

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fa = 10

fa = 8

fa = 5

SW = 9
SW = 5

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Description of function
The trigger measures the signals at the Cnt input. The
pulses received are recorded over a parameterizable period G_T. If the frequency of the pulses received in the period G_T is greater than the on and the off thresholds, the
output Q switches on.
Q switches off again if the measured pulse frequency
reaches or falls below the off threshold.
Par parameter setting

B03:Par
SW=0050+
SW=0048
G_T:01:00s

On threshold
Degree of
protection
Off threshold
Time interval for pulses

SW is the on threshold. It can be any frequency in the

range 0000 to 9999.
SW is the off threshold. It can be any frequency in the
range 0000 to 9999.

G_T is the time interval in which the pulses applied to Cnt

are measured. G_T can be a period between 00.05 s and
99.95 s.
Note
If you specify the time G_T a 1 s, LOGO! returns the current frequency (in Hz) in the fa parameter.
fa is always the sum of the pulses measured per time unit
G_T.

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4.4.17

Analog Trigger

Brief description
The output is switched on, if the analog value exceeds a
parameterizable on threshold. The output is switched off if
the analog value falls below the parameterizable off threshold (hysteresis).
Symbol in
LOGO!

Connection
Input Ax

Description
At the output Ax, apply the
analog signal to be evaluated.
Use the connectors I7 (AI1)
or I8 (AI2).
0-10 V corresponds to
0-1000 (internal value).

Parameter Par:

, , SW,
SW

 : Gain in %

Value range 0..1000 %
 : Offset
Value range 999
SW: on threshold
Value range 19990
SW: off threshold
Value range 19990

Output Q

Q is set or reset depending

on the threshold values.

Gain and Offset parameters

Refer to the information in Section 4.3.6 on the Gain and
Offset parameters.

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Timing diagram
1000

SW
SW
Ax

Description of function
The function reads in the analog value AI1 or AI2.
The Offset parameter is then added to the analog value.
This value is then multiplied by the Gain parameter.

If this value exceeds the on threshold (SW), the output Q

is set to 1.
Q is reset to 0 again if the value violates the off threshold
(SW).

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Par parameter setting
The Gain and Offset parameters are used to adapt the
sensors used to the relevant application.
Parameter assignment

B03:Par
SW =+00000
SW =+00000

 =0050+

On threshold
Off threshold
Gain in %
Degree of protection

Press key

SW=+00000
SW=+00000
 =0050+

 =+200

Offset

Display in PARAM mode (example):

B02:Par
SW =+400
SW =+200
Ax =+20

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4.4.18

Analog Comparator

Brief description
The output is switched on if the difference between Ax and
Ay exceeds the set threshold value.
Symbol in
LOGO!

Connection
Inputs Ax and
Ay

Description
At the Ax and Ay inputs, apply the analog signals
whose difference is to be
evaluated.
Use the connectors I7 (AI1)
and I8 (AI2).

Parameter Par:

, , 

 : Gain in %

Value range 0..1000 %
 : Offset
Value range 999
 : Threshold value

Output Q

Q is set to 1 if the difference

between Ax and Ay exceeds the threshold value.

Gain and Offset parameters

Refer to the information in Section 4.3.6 on the Gain and
Offset parameters.

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Timing diagram
1000

Ax

0
1000

Ay

0
1000

Ax-Ay

>200
0
200

Q
For Ax - Ay > 200

Description of function
The analog comparator function carries out the following
arithmetic operations:
1. The value parameterized for Offset is added to Ax and
Ay.
2. Ax and Ay are multiplied by the Gain parameter.
3. The function produces the difference between the analog values Ax and Ay.
If this value exceeds the threshold value parameterized
under , the output Q is set to 1.
Otherwise, Q is reset to 0.
Rule for calculation
Q = 1 when:
[(Ax + offset)
gain] [(Ax + offset)
gain] > threshold
value

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Par parameter setting
The Gain and Offset parameters are used to adapt the
sensors used to the relevant application.

B03:Par
 =00000

 =0050+
 =+200

120

Threshold value
Gain in %
Degree of protection
Offset

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Example
To control a heating system, the flow temperature Tv (via a
sensor at AI1) and the return temperature Tr (via a sensor
at AI2) are to be compared with each other.
If the return temperature differs by more than 15 C from
the flow temperature, a switching operation is to be triggered (e.g. burner on).
The real temperatures are to be displayed in PARAM
mode.
Temperature sensors with the following technical specifications are available: 30 to +70 C, 0 to 10V DC.
Application

Internal Representation

30 to +70 C = 0 to 10V DC

0 to 1000

0 C

300
 Offset = 300

Value range:

1000

30 to +70 C = 100

 Gain = 100/1000
= 0.1 = 10 %

Switching threshold = 15 C

Threshold value = 15

Parameter assignment

B03:Par
 =00015
 =0010+

 =-300
Display in PARAM mode (examples):

B03:Par
 = 20
Ax = 10
Ay = 30

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B03:Par
 = 30
Ax = 10
Ay = 20

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4.4.19 Stairwell Light Switch

Brief description
Following an input pulse (edge-controlled), a parameterizable timed period starts. The output is reset when the defined period has elapsed. 15 s before the time has elapsed,
an off warning is issued.
Symbol in
LOGO!

Connection

Description

Input Trg

Use the Trg (trigger) input to

start the time for the stairwell light switch (off delay).

Parameter T

T is the time after which the

output is switched off (output state changes from 1
to 0).
Minutes are set as the default time base.

Output Q

Q is switched off when the

time T has elapsed. 15 s before the time has elapsed,
the output switches to 0 for
1 s.

Parameter T
Please refer to the note in Section 4.3.2 when specifying
the values.
Timing diagram
Trg
Q

Ta starts

T
Warning duration

1s
15s
Warning time

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Description of function
If the state of the input Trg changes from 1 to 0, the current
time Ta starts and the output Q is set to 1.
15 s before Ta reaches the time T, the output Q is set to 0
for 1 s.
If the time Ta reaches the time T, the output Q is reset to 0.
Another switch at the input Trg during Ta resets Ta (retrigger
option).
In the event of a power failure, the elapsed time is reset.
Changing the time base
You can also set other values for the warning time and
warning duration .
Time Base T

Warning Time

Warning
Duration

Seconds*

750 ms

50 ms

Minutes

15 s

1s

Hours

15 min

1 min

*Only relevant for programs with a cycle time of < 25 ms

See also Determining the Cycle Time in Appendix C.

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4.4.20 Dual-Function Switch

Brief description
Switch with 2 different functions:
 Current impulse switch with off delay
 Switch (permanent light)
Symbol in
LOGO!

Connection

Description

Input Trg

Switch on the output Q via

the Trg (trigger) input (off
delay or permanent light).
When the output Q is
switched on, it can be reset
with Trg.

Parameter Par

TH is the time after which

the output is switched off
(output state changes from
1 to 0).
TL is the length of time that
has to be set for the input to
activate the permanent light
function.

Output Q

The output Q switches on

with Trg and switches off
again after a parameterizable time depending on the
length of the pulse to Trg, or
it is reset after Trg is activated again.

Parameters TH and TL
Please refer to the note in Section 4.3.2 when specifying
the values.

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Timing diagram
Trig

TL
Q

Ta starts

TH

Description of function
If the state of the input Trg changes from 0 to 1, the current
time Ta starts and the output Q is set to 1.
If the time Ta reaches the time TH, the output Q is reset
to 0.
In the event of a power failure, the elapsed time is reset.
If the state 0 changes to 1 at the input Trg, and 1 remains
set at least for the time TL, the permanent light function is
activated and the output Q is switched on permanently.
If the input Trg is switched again, TH is reset and the output
Q is switched off.

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4.4.21 Message Texts

Brief description
Display of a parameterized message text during RUN.
Symbol in
LOGO!

Connection

Description

Input En

A change in the state from 0

to 1 at the En (Enable) input
starts the output of the message text.

Parameter P

P is the priority of the message text.

Parameter Par

Par is the text for the message output.

Output Q

Q has the same state as the

input En.

Limitation
A maximum of 5 message text functions are possible.
Description of function
If the state at the input changes from 0 to 1, the message
text you have parameterized is displayed in RUN mode.
If the state at the input changes from 1 to 0, the message
text is not displayed.
If several message text functions have been triggered with
En=1, the message with the highest priority is displayed.
If you press the key, the low-priority messages are displayed as well.
You can switch between the standard display and the message text display using the keys and .

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Example
A message could be displayed as follows, for example:
En=1

Motor 2
3000
Hours
Maintenance

I:123456
Su 23:40
Q:1234

Parameter assignment window

To parameterize the priority,
proceed as follows (parameter assignment window for P):

B03:P
Priority 1

To parameterize the message text,

proceed as follows (parameter assignment window for
Par):

..
..
..
..
Use the key to select a line that is to contain a message
text.
Press the OK key to switch to edit mode for this line.
Use the keys and select the letter to be displayed. To
move the cursor from one position to another, use the keys
and .
Press OK to apply the changes or ESC to exit edit mode.

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LOGO! Functions
To output a parameter (e.g. display a measurement or
function value) as a message text in a line, select this line
with the key and press the key:

P
Par
..
..
..
Press the OK key to switch to edit mode.

B01:T

Use the keys and to select between the blocks to be

displayed and the corresponding parameters.
Use the keys and to select the block or the parameter
to be displayed.
To select the parameter, press OK.
Press the ESC key to exit parameter assignment mode.
Your changes are applied.

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5 Parameterizing LOGO!
By parameterization we mean setting the parameters of the
blocks. You can set delay times for time functions, switching times for time switches, the threshold value of a
counter, the monitoring interval of an operating hours
counter and the on and off thresholds of the threshold
switch.
You can set the parameters:
 In programming mode
 In parameterization mode
In parameterization mode the programmer sets a value for
a parameter.
We introduced parameterization mode so that parameters
can be changed without having to change the program. In
this way, a user can change the times without having to
change into programming mode. The advantage of this is
that the program (and thus the circuit) is protected but can
still be modified by the user of the circuit to suit requirements.
Note
LOGO! continues to execute the program in parameterization mode.

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5.1 Switching to Parameterization Mode

To switch to parameterization mode, press ESC and OK at
the same time:

I:123456
Mo 09:00
ESC

OK

Q:1234 RUN
LOGO! switches to parameterization mode and displays
the parameterization menu:

>Set Clock
Set Param

The Set Clock menu item is executed only if your version

of LOGO! has a clock/time switch (those versions of
LOGO! that have a clock have the letter C in their name
e. g. LOGO 230RC). Set Clock allows you to set LOGO!s
time switch.

5.1.1 Parameters
The following can be parameters:
 The delay times of a time relay.
 The switching times (cams) of a time switch.
 The threshold value of a counter.
 The monitoring time of an operating hours counter.
 The switching thresholds of a threshold switch.

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Each parameter is identified by the block number and the
parameter abbreviation. Examples:

B01:T
Block number

Parameter abbreviation

 T: ...is a time that can be set.

 No1: ...is the first cam of a time switch (clock).
 Par: ...refers to several counters that can be monitored.

5.1.2 Selecting a Parameter

To select a parameter, proceed as follows:
1. Select the Set Param option from the parameterization
menu.

Set Clock
>Set Param

2. Press the OK key

LOGO! displays the first parameter. If parameters cannot be set, you can use ESC to return to the parameterization menu.

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Parameter

B01:T
T = 12:00m

Value set for the parameter

Ta= 00:00m

Current time in LOGO!

No parameter can be changed:
ESC returns you to the parameterization menu

No Param
Press ESC
3. Select the desired parameter:
or
LOGO! displays a parameter in a separate window.
4. To change a parameter, select it and press OK.

5.1.3 Changing a Parameter

To change a parameter, you first have to select it (see Selecting a parameter).
You change the value of the parameter in the same way as
you entered it in programming mode:
1. Move the cursor to the point at which you want to make
the change:
or
2. Change the value:
or
3. Accept the value:
OK

B01:T
T = 01:00m
Ta= 00:00m

To move:  or
key

Finished: OK

To change value:  or  key

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You cannot change the unit of the delay time for the parameter T in parameterization mode. This is only possible in
programming mode.
Current value of a time T
If you view a time T in parameterization mode, it looks like
this:

B01:T
T = 12:00m

Time T set

Ta= 00:00m

Current time Ta

You can change the set time T (see Changing a parameter).

Current value of the time switch
If you view a cam of a time switch in parameterization
mode, it looks like this, for example:

B02:No1 1
Day = Su
On =09:00
Off=10:00

The circuit state of the time switch

is displayed:

The time switch is off

(state 0 at the output)

The time switch is on

(state 1 at the output)

LOGO! displays the circuit state of the time switch rather

than the circuit state of a cam. The circuit state of the time
switch depends on all three cams (No1, No 2 and No 3).

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Current value of a counter
If you view the parameter of a counter in parameterization
mode, it looks like this:

B03:Par
Lim=000300

Switching threshold

Cnt=000028

Current count value

Current value of an operating hours counter

If you view the parameters of an operating hours counter in
parameterization mode, it looks like this:

B05:Par
MI = 0100h
MN = 0017h
OT =00083h

Monitoring time
Remaining time
Operating hours elapsed

Current value of a threshold switch

If you view the parameter of a threshold switch in parameterization mode, it looks like this:

B06:Par
SW=0050
SW=0048
fa=0012

134

On threshold
Off threshold
Measured value

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5.2 Setting the Time (LOGO! ... C)

You can set the time:
 In parameterization mode
 In programming mode
Setting the time in parameterization mode:
1. Switch to parameterization mode:
ESC and OK at the same time
2. Select Set Clock and press OK.

Set Clock
_Mo 14:26
MM.DD.YY
06.14.99

The cursor is positioned before the day

of the week.

3. Select the day of the week:

or
4. Move the cursor to the next position:
or
5. Change the value:
or
6. Set the clock to the correct time. Repeat steps 4 and 5.
7. Conclude your input:
OK
Setting the time in programming mode:
1. Switch to programming mode:
, and OK at the same time
2. Select Program and press OK
3. Select (using or ) Set Clock and press OK
Now you can set the day of the week and the time, as described above (as of step 3.).

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Switching between summer and winter time:
LOGO! must be in RUN if you want to switch over the time.
1. If necessary, exit programming or parameterization
mode and switch LOGO! to RUN.
I:12345678
9 10 11 12
Mo 09:17
Q:12345678

Time displayed

2. Press OK and
The current time is put forward by one hour.
I:12345678
9 10 11 12
Mo 10:17
Q:12345678

Time displayed after

change

Change the time in the opposite direction in the same way:

3. Press OK and
The current time is put back by one hour.
I:12345678
9 10 11 12
Mo 09:17
Q:12345678

136

Time displayed after

change

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6 LOGO! Program Modules

You can only keep one program stored in LOGO!. If you
want to change the program or write another program without deleting the first one, you must archive it somewhere.
You can use program modules/cards to do this.
You can copy the program stored in LOGO! to a program
module/card. You can insert the program module/card in a
different LOGO! and in this way copy the program to the
other LOGO!. You can use the program module/card to do
the following:
 Archive programs
 Duplicate programs
 Send programs by post
 Write and test programs in the office and then transfer
them to a different LOGO! in the cabinet.
LOGO! is supplied with a cover. You receive the program
module/card separately.
Note
You do not require a module for permanently storing the
program in your LOGO!.
The LOGO! program is already stored permanently when
programming mode is finished.
Below you will find the two modules that you can get for
LOGO!. Both of them can accommodate the entire program memory of a LOGO!.
Module

Order number

Yellow module: for copying

6ED1 056-1BA00-0AA0

Red module: with know-how

protection and copy protection

6ED1 056-4BA00-0AA0

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6.1 Overview of the Modules

Yellow program module
You can read and write programs with this module.
Red program module
You can only write programs with this module. Once a program has been stored, it cannot be looked at, copied or
changed (i.e. your data is protected).
Programs saved like this can only be run if the module remains inserted in LOGO! while the system is in operation.

Warning
Make sure that you dont save your program on
a module with program protection if you intend to
edit it further.
You can start up a program on a module with
know-how protection but not read it for the purpose of editing.

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Upward compatibility
The modules are only upwardly compatible. This means:
 A module written in a standard variant can be read in all
the other variants.
 A module written in a LOGO! ...L variant can be read in
all the other LOGO! ...L variants; but not into a standard
variant.
 A module written in a LOGO! ...LB11 variant can be
read in all the other LOGO! ...LB11 variants; but not in a
standard variant or in a LOGO! ...L variant.

6.2 Removing and Inserting Modules

When you remove a red program module (know-how
protection and copy protection), always remember that the
program stored on the module can only run if the module is
inserted and remains inserted for the entire time.
If the module is removed, LOGO! displays the message no
program. Removing the red module during operation leads
to impermissible operating statuses.
Always heed the following warning:

Warning
Do not put your finger or an object made of metal
or any other conductive material in the open
shaft of the program module/card.
The socket for the program module/card may be
live if L1 and N have been incorrectly wired.
The program module/card should only be
changed by a trained technician.

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RC0047

Removing the module

Remove the program module/card as follows:

Carefully insert a screwdriver into the slot at the upper end

of the program module/card and ease the program module/
card out of the shaft a little.
You can now remove the program module/card:
Inserting the program module/card
The shaft for the program module/card is chamfered at the
lower right edge. The program module/card also has a
chamfered edge. This prevents you from inserting the program module/card the wrong way around. Insert the program module/card into the shaft until it engages.

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6.3 Copying a Program from LOGO! to the

Program Module/Card
To copy a program to the program module/card, proceed
as follows:
1. Insert the program module/card into the shaft.
2. Switch LOGO! to programming mode:
, and OK at the same time

>Program..
PC/Card..
Start
3. Move the > to PC/Card:
4. Press OK. The transfer menu appears.

>PC
Card
Card

= LOGO!

5. Move the > to LOGO Card:

6. Press OK.
LOGO! copies the program to the program module/card.
When LOGO! has finished copying, it automatically returns
to the main menu:

Program..
>PC/Card..
Start

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The program is now also on the program module/card. You
can now remove the program module/card: Dont forget to
replace the cover.
If there is a power failure while LOGO! is copying, you
have to copy the program again once the power has been
restored.

6.4 Copying from the Module to LOGO!

You have a program module/card containing your program.
You can copy the program to LOGO! in two ways:
 Automatically when LOGO! starts up (power on)
 Via LOGO!s PC/Card menu.
Note
Please note that not all programs stored on the modules
can be read in all LOGO! variants. If necessary, read Section 6.1 again.

Automatic copying when LOGO! starts up

Proceed as follows:
1. Switch off the power supply to LOGO! (power down)
2. Remove the cover shaft.
3. Insert the program module/card into the appropriate
shaft.
4. Switch on the power supply to LOGO! again.

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Result: LOGO! copies the program from the program module/card to LOGO!. As soon as LOGO! has finished copying, LOGO! displays the main menu:

>Program..
PC/Card..
Start

Note
Before you switch LOGO! to RUN, you must ensure that
the system you are controlling with LOGO! does not represent a source of danger.
1. Move the > to Start:
2
key
2. Press OK
Using the PC/Card menu to copy
Read the note about changing the program module/card.
To copy a program from the program module/card to
LOGO!, proceed as follows:
1. Insert the program module/card
2. Switch LOGO! to programming mode:
, and OK at the same time

>Program..
PC/Card..
Start
3. Move the > to PC/Card:
key

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4. Press OK. The transfer menu appears.

PC
Card
>Card

= LOGO!

5. Move the > to Card LOGO:

key or
6. Press OK.
Result: LOGO! copies the program from the program module/card to LOGO!. As soon as LOGO! has finished copying, LOGO! automatically displays the main menu.

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7 LOGO! Software
The program LOGO!Soft Comfort is available as a programming package for the PC. The software has the following functions:
 Offline program generation of your application
 Simulation of your circuit (or program) on the computer
 Generation and printing of a block diagram of the circuit
 Saving the program to the hard disk or another storage
medium
 Program transfer
From LOGO! to the PC
From the PC to LOGO!
The LOGO! alternative
The LOGO! programming software thus represents an alternative to the conventional means of planning:
1. First you develop your applications at your desk.
2. You simulate the application in your computer and test
whether or not it functions properly before the circuit is
actually put to use.
3. You print out the entire circuit in a block diagram or in
several block diagrams sorted according to outputs.
4. You archive your circuits in your PC file system. In this
way you can retrieve a circuit directly if you want to
make changes some time in the future.
5. You transfer the program to LOGO! by pressing just a
few buttons. Your LOGO! is retooled within a very short
space of time.

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LOGO!Soft Comfort
LOGO!Soft Comfort allows you to create control programs
easily and efficiently. Programs are created on the PC using the drag-and-drop technique. You first write the program and then assess which LOGO! variants are required
for the completed program.
One particularly user-friendly feature is the offline program
simulation facility, which enables the simultaneous status
display of multiple special functions and permits extensive
documentation of the programs created. This optional program software also provides a comprehensive online help
system on CD ROM.
LOGO!Soft Comfort runs on Windows 95/98 and Windows NT 4.0 or higher, is server-capable and offers you
freedom and maximum convenience when creating programs.
LOGO!Soft Comfort V2.0
This is the current version of LOGO!Soft Comfort. As of
Version 2.0 you will find all the functions and functionality of
the new devices as well described in this manual.
Upgrading LOGO!Soft Comfort V1.0
If you have an old LOGO!Soft Comfort function, you can
download old programs to the new devices, but you cannot
use programs with the new functions. To do this, you must
upgrade your Version 1.0 to the latest version.
You can only install the upgrade if you have a full version of
LOGO!Soft Comfort V1.0.
Updates & infos
You can download free upgrades and demo versions of the
software
from the Internet at the following address:
http://www.ad.siemens.de/logo/html_00/software.htm.

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7.1 Possible Applications for LOGO! Software

System requirements
The following requirements have to be met in order to run
LOGO!Soft Comfort V2.0:
 IBM-compatible PC
 Pentium 90 or higher
(Pentium 133 recommended)
 32 MB RAM
(64 MB RAM recommended)
 90 MB of free hard disk space
 Microsoft Windows 95/98 or NT4.0
 SVGA graphics card, resolution 800x600, 256 colors
(1024x768 recommended)
 CD-ROM drive + mouse
Installation and operation
Before installation, read the product information documentation and the text files on the CD-ROM.
To install the software, simply follow the instructions on the
installation program. To start the installation program, proceed as follows (installation on CD-ROM should start automatically):
1. Select and start SETUP.EXE
in Windows 95/98 and Windows NT 4.0 either by choosing Start
Run and entering the line: [drive]:\Setup or by
clicking it in Windows Explorer.
2. Follow the instructions in the installation program.
The best way to find out how to use the software is by
working with it on your computer. If you have any questions, use the software online help system.

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The next steps
In the next step we will show you how to connect LOGO! to
a PC. Omit this step, if you currently only have the software available.

7.2 Connecting LOGO! to a PC

Connecting a PC cable
To connect LOGO! to a PC, you need the LOGO! PC
cable.
(Order no. 6ED1 057-1AA00-0BA0 ).
Remove the cover or the program module/card on your
LOGO! and connect the cable there. Connect the other end
of the cable to the serial port of your PC.
Switching LOGO! to PC
LOGO Mode
There are two ways to connect the PC and LOGO!. LOGO!
is either switched to transfer mode when it is on or automatically when the LOGO! power supply is switched on
and the transfer cable is in place.
To switch LOGO! to PC
LOGO mode, proceed as follows:
1. Switch LOGO! to programming mode:
Press , and OK at the same time
2. Select PC/Card:
or
3. Press OK
4. Select PC
LOGO:
or
5. Press OK
LOGO! is now in PC
LOGO mode and the following display appears:

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PC

= LOGO!
STOP:
Press ESC
To switch LOGO! automatically to PC
LOGO mode, proceed as follows:
1. Switch off the power supply to LOGO!
2. Remove the cover or the program module/card and
connect the cable there.
3. Switch the power back on.
LOGO! automatically goes into PC
LOGO mode.
The PC can now access LOGO!. You can find out how to
do this on the online help system of the LOGO! software.
You can interrupt the connection to the PC using ESC on
LOGO!.

7.3 Transfer Settings

To transfer programs between the PC and LOGO!, you
must make certain settings in the LOGO! software. You
can make these settings using the menu of the software
you are using.
LOGO!Soft Comfort
 Specify which LOGO!: LOGO!Soft Comfort works out
which LOGO! variant you will need to use the written
program.
 Options  Interface: You can enter the serial port to
which LOGO! is connected. You can also find out the
correct port automatically (each port is checked by the
program for a connected LOGO!).
 Transfer: PC  LOGO!: Use this to transfer a program
you have created in LOGO!Soft Comfort to LOGO!.
 Transfer: LOGO!  PC: Use this to transfer a program
you have created in LOGO! to LOGO!Soft Comfort.

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8 Applications
To give you an idea of the kind of situations in which you
can use LOGO!, we have compiled a number of application
examples. We have included the circuit diagram of the original solution for each example and compared it with the
solutions using LOGO!.
You can find solutions for the following tasks:
Stairway, hall or corridor lighting . . . . . . . . . . . . . . . . . . 151
Automatic door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Ventilation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Industrial gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Centralized activation and surveillance of several
industrial gates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Fluorescent luminaires . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Rainwater pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Other applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Note
The LOGO! applications are provided free of charge to our
customers. The examples they contain are not binding and
are included to provide general information on how LOGO!
can be used. Customer-specific solutions may be different.
The user is responsible for ensuring that the system operates properly. We would also draw your attention to the
need to comply with any applicable local standards and
system-related installation regulations.
Errors are excepted and the right to make changes reserved.

You can find these applications and tips for further applications on the Internet at:
http://www.ad.siemens.de/logo

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8.1 Stairwell or Hall Lighting

8.1.1 Demands on Stairwell Lighting
The basic requirements for a stairwell lighting system in an
apartment block are as follows:
 When someone is using the stairs, the stairwell lights
should be on.
 If no-one is in the stairwell, the lights should go out in
order to save energy.

8.1.2 Previous Solution

Conventionally, there have been two ways to control such a
lighting system as follows:
 By means of a current impulse relay
 By means of automatic stairway lighting
The wiring for the two lighting systems is identical.

Lights

Distribution box

Distribution by
means of current
impulse relay

Switches

or
automatic
stairway lighting

Components used
 Switches
 Automatic lighting device or current impulse relay

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Lighting system with a current impulse relay
When a current impulse relay is used, the lighting system
behaves as follows:
 When any switch is pressed: the lighting is switched on
 When any switch is pressed again: the lighting is
switched off
Disadvantage: people frequently forget to switch the lights
off.
Lighting system with an automatic lighting device
When an automatic device is used, the lighting system behaves as follows:
 When any switch is pressed: the lighting is switched on
 When the preset time has elapsed, the lights switch off
automatically.
Disadvantage: The lighting cannot be switched on for an
extended period of time (e.g. for cleaning purposes). The
permanent on switch is usually on the stairwell lighting
timer unit which may be difficult or impossible to gain access to.

8.1.3 Lighting System with LOGO!

You can use a LOGO! module to replace the stairwell lighting timer or the current impulse relay. And you can implement both functions (timed off delay and current impulse
relay) in a single unit. What is more, you can incorporate
extra functions without making any alterations to the wiring.
Here are some examples:
 Current impulse relay with LOGO!
 Automatic stairway lighting system with LOGO!
 LOGO! as a multifunctional switching system with the
following functions:
Light on:
Press switch
(Light switches off after the set time elapses)
Permanent light on:
Press switch twice
Light off:
Press switch for 2 seconds

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Wiring of the lighting system with LOGO! 230RC

Lights

N
L
PE
L1 N

I1 I2 I3 I4 I5 I6

SIEMENS

Switches

LOGO! 230RC
Q1

Q2

Q3

Q4

The external wiring for the lighting system using a LOGO!

module is no different from the conventional method of wiring a corridor or stairwell lighting system. Only the automatic lighting timer/current impulse relay is replaced. Additional functions are entered directly in LOGO!.
Current impulse relay with LOGO!

Switch: I1
x

Q1
Lights

In the event of a gate pulse at input I1, output Q1 switches

over.
Automatic stairway lighting system with LOGO!

Switch: I1
T
06:00m

Q1
Lights

In the event of a gate pulse at input I1, output Q1 switches

on and remains on for 6 minutes.

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Applications
Multifunctional switch with LOGO!
I1
I1

Switch light on
On delay
Switch light off

x
T
02.00s

I1
lo

Off delay

Switch permanent light on

I1
x

1
Q1

T
06:00m

&

&
T
02.00s

Latching relay
Current impulse relay

Q1

The diagram shows the circuit for an input with an associated output.
This switch has the following options:
 When the switch is pressed: The light is switched on
and goes off again after the set time of 6 minutes
(T=06:00m) has elapsed (off delay)
 When the switch is pressed twice: The light is
switched on permanently (the latching relay is set via
the current impulse relay).
 When the switch is pressed for 2 seconds: The light
is switched off (on delay switches the light off; both the
permanent light and the normal light; this branch of the
circuit is therefore used twice)
You can enter these circuits several times for the remaining
inputs and outputs. Instead of using 4 automatic stairway
lighting systems or 4 current impulse relays, you thus use
only a single LOGO!. However, you can also use the free
inputs and outputs for completely different functions.

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8.1.4 Special Features and Enhancement Options

Features such as the following are available for adding
functions or saving energy:
 You can have the light flash before it goes off automatically.
 You can integrate various central functions:
Central off
Central on (panic button)
Control of all lights or individual circuits by a daylight
control switch
Control by the integrated time switch
(e.g. permanent light only until 24.00 hours; no enabling at certain times)
Automatic switching off of the permanent light after a
preset time has elapsed (e.g. after 3 hours)

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8.2 Automatic Door

You often find automatic door control systems at the entrance to supermarkets, public buildings, banks, hospitals
etc.

8.2.1 Demands on an Automatic Door

 When somebody approaches, the door must open automatically.

 The door must remain open until there is nobody in the

doorway anymore.
 If there is nobody in the doorway anymore, it must close
automatically after a short time.
Outside

Motion detector
B1

S1

Inside

Limit switch S2
closed

B2
Motion detector

Limit switch
open

Q1 Main switch

Motion detector

Main switch

The door is generally driven by a motor with a safety clutch.

This prevents people from being caught or injured in the
door. The control system is connected to the mains via a
main switch.

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8.2.2 Previous Solution

Auxiliary circuit
L1

S2
K3

S2

K3

B1

B2

S1

K2
K1
N
Open

K3

K4

Close

B1
B2

K1
K2

K3

K3

K4

Open door

Waiting time

As soon as one of the motion detectors B1 or B2 registers

somebodys presence, the door is opened by K3.
If the two motion detectors detect nothing for a minimum
period, K4 enables the close operation.

8.2.3 Door Control System with LOGO!

LOGO! allows you to considerably simplify the circuit. You
need only connect the motion detectors, the limit switches
and the master contactors to LOGO!.

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Applications
Wiring of the door control system with LOGO! 230RC
L1

B1

B2

L1 N

S1

S2

I1 I2 I3 I4 I5

I6

SIEMENS

LOGO! 230RC
Q1

K1

Q2

Q3

Q4

K2

N
Open

Close

Components used
 K1
 K2
 S1 (NC contact)
 S2 (NC contact)
 B1 (NO contact)
 B2 (NO contact)

158

Master contactor Open

Master contactor Close
Limit switch Closed
Limit switch Open
Infrared motion detector Outside
Infrared motion detector Inside

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Diagram of the door control system with LOGO!
1
I1
I2
x

RS

Open

I4
x

Q1

I4

&

&

Q2

T=
4s

&
Q2

I3

1
Close

Q1

This is what the functional block diagram that corresponds

to the circuit diagram of the conventional solution looks like.
You can simplify this circuit if you make use of LOGO!s
functions. You can use the off delay to replace the latching
relay and on delay. The following function block diagram
illustrates this simplification:
Motion
detector

1
I1
I2
x

&

Q2

Q1
Open

x
10 s

Limit switch
I4
Door open

1
&
Limit switch
Door closed

Q2

I3

Close

1
Q1

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8.2.4 Special Features and Enhancement Options

Functionality and user friendliness can be improved in the
following ways, for example:
 You can connect an additional control switch: Open
Automatic Closed (O-A-C)
 You can connect a buzzer to one of LOGO!s outputs to
indicate when the door is about to close.
 You can include time and direction-dependent enabling
of door opening (so that it only opens during shop opening hours or only from the inside to the outside after
closing time).

8.2.5 Enhanced LOGO! 230RC Solution

Wiring of the enhanced LOGO! solution
L1

B1

S1

B2

L1 N

S3

S2

I1 I2 I3 I4 I5

O-A-G

I6

SIEMENS

LOGO! 230RC
Q1

K1

Q2

K2

Q3

Q4

H1

N
Open

160

Close

Buzzer

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Functional block diagram of the enhanced LOGO! solution
No1:
Day= Mo..Fr
On = 09:00
Off =18:00
No2:
Day= Sa
On = 08:00
Off =13:00

Detecting motion

x
x

I1
Motion detector B1

x
T= 10 s

No1:
Day= Mo..Fr
On = 09:00
Off =19:00
No2:
Day= Sa
On = 08:00
Off =14:00

x
I2
Motion detector B2

Motor for opening

Close output

Q2

Q1
Open

x
Limit switch
Door open
Control switch
Door open

I4
I5

Motor for closing

Limit switch
Door closed

I3

Open output
Motion detector B1
Motion detector B2

Q1
I1
I2

Control switch
Close door

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Close

I6

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Applications
Detecting motion
During business hours, motion detector B1 opens the door
as soon as somebody wants to enter the shop from outside. Motion detector B2 opens the door if somebody wants
to leave the shop.
After closing time, motion detector B2 continues to open
the door for 1 hour so that customers can leave the shop.
Motor for opening
Output Q1 is switched on and opens the door when the
following occurs:
 The control switch at 15 is operated (the door is to be
constantly open) or
 The motion detectors indicate that somebody is approaching the door and
 The door is not yet fully open (limit switch at I4).
Motor for closing
Output Q2 is switched on and closes the door when the
following occurs:
 The control switch at 16 is operated (the door is to be
constantly closed) or
 The motion detectors indicate that there is nobody near
the door and
 The door is not yet fully closed (limit switch at I3).
Buzzer
Connect the buzzer to output Q3. The buzzer sounds for a
short time (in this case 1 second) when the door is closed.
Enter the following circuit at Q3 in the block diagram:
Q2
Close
output
x

Q3
Buzzer

T= 1 s

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8.3 Ventilation System

8.3.1 Demands on a Ventilation System
The purpose of a ventilation system is either to bring fresh
air into a room or to extract stale air from a room. Consider
the following example:

Fresh-air fan

Flow sensor

Flow sensor

Extractor fan

 The room contains an extractor fan and a fresh-air fan.

 Both fans are monitored by a flow sensor.
 The pressure in the room must not be allowed to rise

above atmospheric pressure.

 The fresh-air fan must only be switched on provided reliable functioning of the extractor fan is signaled by the
flow sensor.
 A warning lamp indicates if one of the fans fails.

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Applications
The circuit diagram for the previous solution is as follows:
Auxiliary circuit
L1
S0
S1

K1

K2

K5

K4

K5

S2
S2 v>

K1
N

S3 v>

K2

K3

Stale air

K4

H1

K5

H2

Operation Fault

Fresh air

The fans are monitored by flow sensors. If, after a short

delay, no air flow is registered, the system is switched off
and a fault reported. Acknowledge this by pressing the stop
switch.
Monitoring the fans requires an analyzer circuit with several
switching devices in addition to the flow sensors. The analyzer circuit can be replaced by a single LOGO! module.
Wiring of the ventilation system with LOGO! 230RC
L1
S1

L1 N

S0

S2 v>

S3 v>

I1 I2 I3 I4 I5 I6

SIEMENS

LOGO! 230RC
Q1

K1
Exhaust fan

164

Q2

K2

Q3

H1

Q4

H2

Fresh-air fan

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Components used
 K1
 K2
 S0 (NC contact)
 S1 (NO contact)
 S2 (NO contact)
 S3 (NO contact)
 H1
 H2

Master contactor
Master contactor
Stop switch
Start switch
Flow sensor
Flow sensor
Indicator lamp
Indicator lamp

Block diagram of the LOGO! solution

The block diagram of the ventilation control system with
LOGO! is as follows:
On

I1

Fault

Q3
Q1
Exhaust
fan

x
Off

I2

Extractor fan

Q1
x

Extractor fan

Exhaust air
flow sensor

Q1

Exhaust air flow

sensor

I3

Extractor fan

I3

Q2
Fresh-air
fan

x
T=
10 s

Q2

x
Fresh-air flow
sensor
I4

x
T= 10 s
Off

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A5E00067781 01

I2

Q3
Fault

165

Applications

8.3.2 Advantages of Using LOGO!

If you use a LOGO! module you require fewer switching
devices. That saves you installation time and space in the
control cabinet. Under certain circumstances it may even
allow you to use a smaller control cabinet.
Additional options when using LOGO!
 The free output (Q4) can be used as a potential-free
signaling contact in the event of a fault or a power failure.
 It is possible to stagger the switching-off of the fans.
These functions can be implemented without additional
switching devices.
Functional block diagram of the enhanced LOGO! solution
The fans at Q1 and Q2 are switched on and off as shown in
the following circuit:
I1

On

Fault

Q3
Q1
Exhaust
fan

I2
x

Off

Exhaust air flow

sensor

T=
30 s

I3
x

x
T=
10 s

Q1 exhaust fan
Exhaust air flow
sensor
I3

Q2
Fresh-air
fan

x
T=
10 s
x

Q2 exhaust fan
x
Fresh-air flow
sensor
I4

T=
10 s
Off

166

I2

Q3
Fault

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Applications
You can also generate a message via output Q4:

Q3
Fault

Q4
Message

The relay contacts of output Q4 are always closed when

the system is running. Relay Q4 does not release unless
there is a power failure or a fault in the system. This contact can be used for teleindication, for example.

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Applications

8.4 Industrial Gate

Safety pressure bar

Warning light

There is often a gate at the entrance to a companys premises. This is only opened to let vehicles in and out.
The gate is controlled by the gateman.

8.4.1 Demands on the Gate Control System

 The gate is opened and closed by operating a switch in
the gatehouse. The gateman is able to monitor the operation of the gate at the same time.
 The gate is normally fully opened or closed. However,
movement of the gate can be halted at any time.
 A flashing light is activated 5 seconds before the gate
begins to move and continues for as long as the gate is
in motion.
 A safety pressure bar ensures that nobody gets injured
and nothing gets trapped or damaged when the gate
closes.

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8.4.2 Previous Solution

Various kinds of control systems are used to operate automatic gates. The circuit diagram shows one possible gate
control circuit.
Auxiliary circuit
L1
S0
S1

K1

S2

K3

K1

K3

S2
S1
S5 p>
K3
S3
K1
N

S5 p>

K1

K2

S4
K2

K4

K6

K3

K4

Open

K5

H1
Flashing light

Close

K5
K6

Open Close

Wiring of the gate control system with LOGO! 230RC

L1
S1
Open

S2
S0
Close Stop

L1 N

S3

I1 I2 I3 I4 I5

S4

p>
S5

I6

SIEMENS

LOGO! 230RC
Q1

Q2

Q3

Q4

S5 p>
N

K1
Open

LOGO! Manual
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K3

H1

Close

Flashing light

169

Applications
Components used
 K1
 K2
 S0 (NC contact)
 S1 (NO contact)
 S2 (NO contact)
 S3 (NC contact)
 S4 (NC contact)
 S5 (NC contact)

Master contactor
Master contactor
Stop switch
Open switch
Close switch
Open position switch
Closed position switch
Safety pressure bar

Functional diagram of the LOGO! solution

Q2
Open
I1
Start switch
Open I2
Start switch

T=
5s

Q1
Open

Stop switch I3
Gate is open

I4
x
x
T=
2s

Close start
switch

Q3
Flashing
light

Q1
x
Close start switch

I2
T=
5s

Open start switch

Q2
Close

I1
x

Stop switch
Safety bar

I3
I6

Gate is closed

I5

The open and close start switches move the gate in the
appropriate direction provided it is not already moving in
the other direction. Movement of the gate is halted by the
stop switch or the relevant limit switch. The gate is also
prevented from closing by the safety bar.

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8.4.3 Enhanced LOGO! Solution

In our enhanced solution the gate will automatically open
again when the safety bar is operated.
Safety bar
I6
x

Q2

x
Stop switch

I3

Gate is open

I4

Q1
Open

T=
5s

Q2
x
Open start switch I1

T=
2s

Q1

Q3
Flashing
light

x
Close start
switch

I2
T=
5s

Stop switch

I3

Safety bar

I6

Gate is closed

I5

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Q2
Close

171

Applications

ASi master

8.5 Centralized Activation and Surveillance

of Several Industrial Gates

1 Safety pressure bar 2

Flashing warning light

There are often a number of different entrances to a companys premises. Not all gates can always be surveilled
directly by a member of staff. They must therefore be able
to be surveilled and operated by a gateman who sits in a
central control room.
It is also important to ensure that a member of staff can
open and close the gate directly at the gate.
A LOGO!230RCLB11 is used for each gate. The modules
are linked to each other and an ASi master by means of the
ASi bus.
In this chapter, we will describe the gate control system
used for a gate. All the other gate control systems are identical.

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8.5.1 Demands on the Gate Control System

 Each gate is opened and closed by means of a cord-op




erated switch. The gate is normally fully opened or

closed.
Each gate can also be opened and closed using
switches at the gate.
The ASi bus connection enables the gateman to open
and close the gate from the gatehouse. The state GATE
OPEN or GATE CLOSED is indicated in the gatehouse.
A flashing light is activated 5 seconds before the gate
begins to move and continues for as long as the gate is
in motion.
A safety pressure bar ensures that nobody gets injured
and nothing gets trapped or damaged when the gate
closes.

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Applications
Wiring of the gate control system with LOGO! 230RCLB11
L1

p>
S0

L1

S1

I1

S2 S3

I2

I3

S4

I4

S5

I5

S6

I6

I7

I8

I9

I10 I11 I12

AS interface

SIEMENS

Output 8x

Q1

Q3

Q2

Q4

Q5

Q6

Q7

Q8

p>
S6

K1

K2

N
Gate
open

Gate
closed

Flashing
light

Components used
 K1
 K2
 S0 (NO contact)
 S1 (NO contact)
 S2 (NO contact)
 S3 (NO contact)
 S4 (NC contact)
 S5 (NC contact)
 S6 (NC contact)

174

Master contactor opening

Master contactor closing
OPEN cord-operated switch
CLOSE cord-operated switch
Open switch
Close switch
OPEN GATE position switch
CLOSE GATE position switch
Safety pressure bar

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Applications
Higher-level control system
 Qa1
OPEN GATE position switch
 Qa2
CLOSE GATE position switch
 Ia1
External OPEN GATE switch
 Ia2
External CLOSE GATE switch

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Applications
Functional diagram of the LOGO! solution
I5
I1
Ia1

Gate is open

&

1

Gate open
Gate open

1

Q1
x

I5

Gate is open

I3
I5

Open gate by hand

Gate is open

T
05.00s

Gate
open

&
x

I4
I6
I7
I6

1

&

=1

Q2
T
05.00s

Gate is closed

&

I2Closed 1
Ia2
x
I7
Safety bar
Gate is closed
Safety bar
x

I5

Closed

I6
I7

&

Close gate by hand

Gate is closed
Safety bar

Gate is open

Gate
closed

1

&

Q3
x

T
02.00s

Flashing
light
Qa1
Open
Closed

I6

Gate is closed

Qa2

The OPEN gate and CLOSE gate start switches move the
gate in the appropriate direction provided it is not already
moving in the other direction. Movement of the gate is
halted by the relevant limit switch. The gate is also prevented from closing by the safety bar.

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Applications

8.6 Fluorescent Luminaires

Fluorescent
luminaire 1

Fluorescent
luminaire 3

Fluorescent
luminaire 2

Fluorescent
luminaire 4

Office

Corridor

When lighting systems are planned in companies, the type

and number of lamps used depends on the level of lighting
required. For reasons of cost efficiency, fluorescent luminaires arranged in rows of tubes are often used. They are
subdivided into switching groups according to how the
room is used.

8.6.1 Demands on the Lighting System

 The fluorescent luminaires are switched on and off locally.
 If there is sufficient natural light, the luminaires on the
window side of the room are automatically switched off
by means of a brightness-sensitive switch.
 The lights are switched off automatically at 20.00.
 It must be possible at all times to switch the lights on
and off locally.

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Applications

8.6.2 Previous Solution

L1

lx>
B1

E1

K1

K1

K2

S1

S2

K3

K4

K2

S3

S4

K3

K4

K5

K6

K5

K6

E2

E3

E4

E5

E1

K2

The lights are operated by means of a current impulse

relay controlled by switches at the door. Independently of
this, they are reset by the time switch or by the brightnesssensitive switch via the central off input. The switching-off
commands must be cut by interval time-delay relays so that
it is still possible to switch the lights on and off locally after
they have been switched off centrally.
Components required:
 Switches S1 to S4
 Daylight control switch B1
 Time switch E1
 Interval time-delay relays K1 and K2
 Remote-control switches with central off K3 to K6
Disadvantages of the previous solution
 To implement the required functions, a large amount of
circuitry is necessary.
 The large number of mechanical components means
that considerable wear and high maintenance costs can
be expected.
 Functional changes are costly to implement.

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8.6.3 Fluorescent Luminaire Control with

LOGO! 230RC
L1

S1

S2

S3

S4

lx<
B1

L1 N

I1

I2

I3

I4

I5

I6

SIEMENS

LOGO! 230RC
Q1

E2

Q2

E3

Q3

E4

Q4

E5

N
Fluorescent
lamp 1

Fluorescent
lamp 2

Fluorescent Fluorescent
lamp 3
lamp 4

Components used
 S1 to S4 (NO contact)
 B1 (NO contact)

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Switches
Daylight control switch

179

Applications
Functional diagram of the LOGO! solution
Switch-off pulse generated by time switch
Mo..Su
20:00 20.01
Mo..Su
21:00 21.01

T=
1s

I3
x

Switch-off pulse generated by daylight control switch

Daylight control switch I5
T=
1s

I4

Luminaire 4
Corridor side
Q4

I1

Luminaire 1
Window side
Q1

x
I5

I2
x

Luminaire 3
Corridor side
Q3

Luminaire 2
Window side
Q2

Advantages of the LOGO! solution

 You can connect the lamps directly to LOGO! provided
the switching capacity of the individual outputs is not
exceeded. In the case of greater capacities, you should
use a power contactor.
 Connect the brightness-sensitive switch directly to one
of LOGO!s inputs.
 You dont need a time switch since this function is integrated in LOGO!.
 The fact that fewer switching devices are required
means that you can install a smaller sub-distribution unit
and thus save space.
 Fewer devices are required
 The lighting system can be easily modified.
 Additional switching times can be set as required (staggered switch-off pulses at the end of the day).
 The brightness-sensitive switch function can easily be
applied to all lamps or an altered group of lamps.

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Applications

8.7 Water Pump

Nowadays, private households are increasingly making use
of rainwater alongside the mains domestic water supply.
This saves money and helps protect the environment.
Rainwater can be used for the following, for example:
 Washing clothes
 Watering the garden
 Watering indoor plants
 Washing the car
 Flushing the toilet
The sketch below illustrates how such a rainwater supply
system works:
Rainwater inlet

K4

Mains water inlet

Pressure switch
S1

Control in the
distribution box

Pump
M1
Rainwater
collecting tank
S2
S3
S4

Pressure tank
Water pipe

Mains water inlet off

Mains water inlet on
Run-dry prevention off
Run-dry prevention on

The rainwater is collected in a large water butt. From the

water butt it is pumped by a pumping station into a piping
system provided for it. From there it can be drawn off in the
same way as the normal household water supply. If the water butt should run dry, it can be topped up with mains water.
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Applications

8.7.1 Demands on the Control System of a

Rainwater Pump
 The system must be capable of supplying water at all
times. If necessary, the control system must switch over
to mains water if the rainwater runs out.
 The system must not allow rainwater to enter the mains
supply when switching over to mains water.
 The pump cannot be switched on if there is not enough
water in the rainwater butt (run-dry prevention system).

8.7.2 Previous Solution

Auxiliary circuit
L1

K3

S3

S1 p<

K2

K1
N
Pump

K2

S4

S2

K3

K3

Overrun time Run-dry

protection

S3

K4

K4

Y1

Pure water
inlet

The pump and a solenoid valve are controlled by means of

a pressure switch and 3 float switches that are fitted in the
rainwater butt. The pump must be switched on when the
pressure in the cylinder falls below the minimum level.
Once the operating pressure has been reached, the pump
is switched off again following a short overrun period of a
few seconds. The overrun time prevents the water pump
continuously cutting in and out if water is drawn off for any
length of time.

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Applications

8.7.3 Rainwater Pump with LOGO! 230RC

L1

S1 p<

S2

L1 N

I1

S3

I2

I3

I4

S4

I5

I6

SIEMENS

LOGO! 230RC
Q1

K1

Q2

Q3

Q4

Y1

N
Pump

Mains water inlet

Apart from LOGO!, you only need the pressure switch and
the float switches to control the pump. If you are using a
3-phase AC motor, you must use a master contactor for
switching the pump. On systems using single-phase AC
pumps, you must fit a contactor if the AC pump requires a
higher current than can be switched by the output relay Q1.
The power of a solenoid valve is so low that it can normally
be controlled directly.
 K1
Master contactor
 Y1
Solenoid valve
 S1 (NO contact) Pressure switch
 S2 (NO contact) Float switch
 S3 (NC contact) Float switch
 S4 (NC contact) Float switch

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Applications
Block diagram of the LOGO! solution
Pressure switch I1
x
T = 20 s

Float switch for rundry protection off

Pump
Q1

I3

Float switch for runI4

dry protection on
Float switch for
mains water inlet off

Float switch for mains water inlet off

I3

Mains water inlet

Q2
I2

8.7.4 Special Features and Enhancement Options

The function diagram shows how you can connect up the
control system for the pump and the solenoid valve. Its layout corresponds to that of the current flow diagram. You
also have the possibility of incorporating additional functions for specific applications that would only be possible
with the inclusion of extra equipment if you were using conventional technology, e.g.:
 Enabling the pump at specific times
 Indication of imminent or existing shortage of water
 Reporting of system faults

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Applications

8.8

Further Potential Applications

In addition to the above applications, we have also put a
selection of 23 further potential applications on the Internet
(updated June 1999) at www.ad.siemens.de/logo/
html_00/einsatz.htm.
The following are some of the examples you can find there:
 Watering greenhouse plants
 Control of conveyor systems
 Control of a bending machine
 Shop window lighting
 Bell system (e.g. in a school)
 Parking lot surveillance
 Exterior lighting
 Control system for shutters
 Interior and exterior lighting for an apartment block
 Control system for a cream stirrer
 Sports hall lighting
 Equal distribution of 3 loads
 Sequence control system for cable-welding machines
with large cross-sections
 Step switch (e.g. for fans)
 Boiler sequence control
 Control system for several pump sets with centralized
operation
 Cutting device (e.g. for detonating fuses)
 Monitoring length of use (e.g. in solar energy system)
 Intelligent foot buttons (e.g. to select speeds)
 Control of an elevating platform
 Impregnation of textiles heating and conveyor control
system
 Silo-filling system
And many more.

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Applications
You can also find descriptions and the relevant circuit diagrams of the applications on the Internet. You can read
these *.pdf files with Adobe Acrobat Reader. And if you
have installed the LOGO!Soft or LOGO!Soft Comfort programming software on your PC, you can simply download
the relevant circuit diagrams at the touch of a button, adapt
them to your requirements, transfer them into LOGO! via
the PC cable and start to use them.
Advantages of using LOGO!
It is worth using LOGO! particularly when you:
 Can replace a number of auxiliary switching devices
with the integrated functions of LOGO!.
 Want to save yourself wiring and installation work (because the wiring is done in LOGO!).
 Want to reduce the space required for components in
the control cabinet/distribution box. You may be able to
use a smaller control cabinet/distribution box.
 Can add or change functions subsequently without having to install an additional switching device or change
the wiring.
 Have to provide your customers with additional functions for their domestic or building installation. Here are
some examples:
Home security: You can program LOGO! to switch a
lamp on regularly or open and close your shutters
while you are on holiday.
Heating system: You can program LOGO! to run the
circulation pump only when water or heat is really
required.
Cooling systems: You can program LOGO! to thaw
your cooling systems automatically on a regular basis to save energy costs.
You can illuminate aquaria and terraria automatically
on a time-dependent basis.

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Applications
You can also:
 Use commercially available switches and buttons, which
makes it easy to integrate in the installation.
 Connect LOGO! directly to your domestic installation
due to its integrated power supply.
Do you have any suggestions?
There are definitely more ways to use LOGO!. If you know
of one, why not write to us? We will collect all the suggestions we receive, and we intend to pass on as many as we
can. So drop us a line no matter how unusual or simple
your LOGO! circuit is! We would be delighted to receive
your suggestions.
Write to:
Siemens AG
A&D AS MVM LOGO!
Postfach 48 48
D-90327 Nuernberg

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A Technical Specifications
A.1 General Technical Specifications
Criterion

Complies with

Values

Dimensions (WxHxD)

72 x 90 x 55 mm

Weight

Approx. 190 g

Installation

On 35 mm DIN rail
width of 4 modules

LOGO!...L...:
Dimensions (WxHxD)

126 x 90 x 55 mm

Weight

Approx. 360 g

Installation

On 35 mm DIN rail
width of 7 modules

Climatic environmental conditions

Ambient temperature
Horizontal installation
Vertical installation

Cold:
IEC 68-2-1
Heat:
IEC 68-2-2*

IEC 68-2-30

Air pressure
Pollutants

0 ... 55 C
40 C ... +70 C

Storage/transport
Relative humidity

0 ... 55 C
C

From 5 to 95 %
no condensation
795 ... 1080 hPa

IEC 68-2-42

SO2 10 cm3 /m3, 4 days

IEC 68-2-43

H2S 1 cm3 /m3, 4 days

Mechanical environmental conditions

Type of protection
Vibrations:

IP20
IEC 68-2-6

10 ... 57 Hz (constant
amplitude 0.15 mm)
57 ... 150 Hz (constant
acceleration 2 g)

Shock
*IEC

188

IEC 68-2-27

18 shocks
(Halfsine 15g/11ms)

68 includes VDE 0631

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Technical Specifications
Criterion

Complies with

Values

Drop

IEC 68-2-31

Drop height 50 mm

Free fall (packaged)

IEC 68-2-32

1m

Electromagnetic compatibility (EMC)

Electrostatic discharge

IEC 801-2

8 kV air discharge

Severity 3

6 kV contact discharge

Electromagnetic fields

IEC 801-3

Field strength 10 V/m

Interference suppression

EN 55011

Limit class B group 1

Limit class for ASi operation

EMC emitted interference

EN 50081-2

Interference immunity

EN 50082-2

Burst pulses

IEC 801-4
Severity 3

2 kV (supply and signal

lines)
B11 variants: to ASi
Complete Specification
V 2.0 dated 27.11.95

Energy carriers

IEC 801-5

Single pulse (surge)

Severity 2

0.5 kV (power lines)

symmetrical
1 kV (power lines) asymmetrical

(applies only to LOGO!

230....)
Information on IEC / VDE  safety
Measurement of clearance and creepage distance

IEC 664, IEC 1131, Fulfilled

EN 50178 draft
11/94 UL 508, CSA
C22.2 No 142
Also VDE 0631 for
LOGO! 230R/RC

Insulation strength

IEC 1131

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Fulfilled

189

Technical Specifications

A.2 Technical Specifications: LOGO! 230...

LOGO! 230RC
LOGO! 230RCo

LOGO! 230RCL
LOGO! 230RCLB11

Input voltage

115/230 V AC

115/230 V AC

Permissible range

85 ... 253 V AC

85 ... 253 V AC

Permissible mains frequency

47 ... 63 Hz

47 ... 63 Hz

10 ... 30 mA

15 ... 65 mA

10 ... 20 mA

15 ... 40 mA

Typically
y
y 10 ms

Typically
y
y 10 ms

Typically 20 ms

Typically 20 ms

 115 V AC
 230 V AC

1 1 ... 3.5
1.1
35W

1 7 ... 7.5
1.7
75W

2 3 ... 4.6
2.3
46W

3 4 ... 9.2
3.4
92W

Clock buffering at 25 C

Typically 80 h

Typically 80 h

Accuracy of the realtime

clock

Max. 5 s a day

Max. 5 s a day

Number

12

Electrical isolation

No

No

< 40 V AC

< 40 V AC

> 79 V AC

> 79 V AC

< 0.03 mA

< 0.03 mA

> 0.08 mA

> 0.08 mA

Power supply

Power consumption

 115 V AC
 230 V AC
Voltage failure bridging

 115 V AC
 230 V AC
Power loss at

Digital inputs

Input voltage L1

 Signal
g
0
 Signal 1
Input current at

 Signal
g
0
 Signal 1

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Technical Specifications
LOGO! 230RC
LOGO! 230RCo

LOGO! 230RCL
LOGO! 230RCLB11

 0 after 1
 1 after 0

Typically
y
y 50 ms

Typically
y
y 50 ms

Typically 50 ms

Typically 50 ms

Line length (unshielded)

100 m

100 m

Number

Output type

Relay outputs

Relay outputs

Electrical isolation

Yes

Yes

In groups of

Activation of digital input

Yes

Yes

Continuous current Ith (per

connector)

Max. 10 A

Max. 10 A

230/240 V AC

1000 W

1000 W

115/120 V AC

500 W

500 W

Fluorescent tubes with electr.

control gear (25,000 switching cycles)

10 x 58 W (at
230/240 V AC)

10 x 58 W (at
230/240 V AC)

Fluorescent tubes, conventionally compensated (25,000

switching cycles)

1 x 58 W (at
230/240 V AC)

1 x 58 W (at
230/240 V AC)

Fluorescent tubes, uncompensated (25,000 switching

cycles)

10 x 58 W (at
230/240 V AC)

10 x 58 W (at
230/240 V AC)

Short circuitproof cos 1

Power protection
B16
600A

Power protection
B16
600A

Shortcircuit proof cos 0.5 to

0.7

Power protection
B16
900A

Power protection
B16
900A

Delay time at

Digital outputs

Incandescent lamp load

(25,000 switching cycles) at

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Technical Specifications
LOGO! 230RC
LOGO! 230RCo

LOGO! 230RCL
LOGO! 230RCLB11

Derating

None throughout
the entire temperature range

None throughout
the entire temperature range

Parallel switching of outputs

to increase power

Not permitted

Not permitted

Protection of output relay (if

desired)

Max. 16 A,
characteristic B16

Max. 16 A,
characteristic B16

Mechanical

10 Hz

10 Hz

Ohmic load/lamp load

2 Hz

2 Hz

Inductive load

0.5 Hz

0.5 Hz

Switching rate

ASislave connection (LOGO! 230RCLB11 only)

ASi profile

7.F

 I/O config
 ID code

7h

Number of virtual digital inputs

Number of virtual digital outputs

Power supply

ASi power supply

unit

Power consumption

Typically 30 mA

Electrical isolation

Yes

Reverse polarity protection

Yes

192

Fh

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Technical Specifications

A.3 Technical Specifications: LOGO! 24 Basic

LOGO! 24

LOGO! 24RC
LOGO! 24RCo

Input voltage

24 V DC

24 V AC

Permissible Range

20.4 to 28.8 V DC

20.4 ... 26.4 V AC

Power consumption from

24 V DC

10 ... 20 mA

15 ... 120 mA

Power supply

Voltage failure bridging

Power loss at 24 V

Typically 5 ms
0.2 ... 0.5 W

0.3 ... 1.8 W (AC)

Clock buffering at 25 C

Typically 80 h

Accuracy of the realtime

clock

Max. 5 s a day

Digital inputs
Number

Electrical isolation

No

No

< 5 V DC

< 5 V AC

> 8 V DC

> 12 V AC

 Signal 0

< 1.0 mA (I1...I6)

( , I8))
< 0.05 mA (I7,

< 1.0 mA

 Signal 1

> 1.5 mA (I1...I6)

> 0.1 mA (I7, I8)

> 2.5 mA

 0 after 1
 1 after 0

Typically
y
y 1.5 ms

Typically
y
y 1.5 ms

Typically 1.5 ms

Typically 15 ms

Line length (unshielded)

100 m

100 m

Input voltage L+

 Signal
g
0
 Signal 1
Input current at

Delay time at

Analog inputs
Number

LOGO! Manual
A5E00067781 01

2 (I7, I8)

193

Technical Specifications
LOGO! 24
Range

0 ... 10 V DC

Max. input voltage

28.8 V DC

LOGO! 24RC
LOGO! 24RCo

Digital outputs
Number

Output type

Transistor,
currentsourcing

Relay outputs

Electrical isolation

No

Yes

In groups of

Activation of digital input

Yes

Output voltage

 Supply voltage

Output current

Max. 0.3 A

Continuous current Ith

Max. 10 A

Incandescent lamp load

(25,000 switching cycles) at

1000 W

Fluorescent tubes with electr.

control gear (25,000 switching cycles)

10 x 58 W

Fluorescent tubes, conventionally compensated (25,000

switching cycles)

1 x 58 W

Fluorescent tubes, uncompensated (25,000 switching

cycles)

10 x 58 W

Short circuitproof and overloadproof

Yes

Shortcircuit current limitation

Approx. 1 A

Derating

None throughout
the entire temperature range

Short circuitproof cos 1

194

None throughout
the entire temperature range
Power protection
B16
600A

LOGO! Manual
A5E00067781 01

Technical Specifications
LOGO! 24
Shortcircuit proof cos 0.5 to
0.7
Parallel switching of outputs
to increase power

LOGO! 24RC
LOGO! 24RCo
Power protection
B16
900A

Not permitted

Protection of output relay (if

desired)

Not permitted
Max. 16 A,
characteristic B16

Switching rate
Mechanical

10 Hz

Electrical

10 Hz

Ohmic load/lamp load

10 Hz

2 Hz

Inductive load

0.5 Hz

0.5 Hz

LOGO! Manual
A5E00067781 01

195

Technical Specifications

A.4 Technical Specifications: LOGO! 24 Long

LOGO! 24L

LOGO! 24RCL
LOGO! 24RCLB11

Input voltage

24 V DC

24 V DC

Permissible range

20.4 to 28.8 V DC

20.4 to 28.8 V DC

Power consumption from

24 V DC

10 ... 30 mA
+ 0.3 A per output

15 ... 120 mA

Power supply

Voltage failure bridging

Power loss at 24 V DC

Typically 5 ms
0.2 ... 0.8 W

0.3 ... 2.9 W

Clock buffering at 25 C

Typically 80 h

Accuracy of the realtime

clock

Max. 5 s a day

Electrical isolation

No

No

Reverse polarity protection

Yes

Yes

Number

12

12

Electrical isolation

No

No

< 5 V DC

< 5 V DC

> 12 V DC

> 12 V DC

< 1.5 mA

< 1.5 mA

> 4.5 mA

> 4.5 mA

 0 after 1
 1 after 0

Typically
y
y 1.5 ms

Typically
y
y 1.5 ms

Typically 1.5 ms

Typically 1.5 ms

Line length (unshielded)

100 m

100 m

Digital inputs

Input voltage L+

 Signal
g
0
 Signal 1
Input current at

 Signal
g
0
 Signal 1
Delay time at

196

LOGO! Manual
A5E00067781 01

Technical Specifications
LOGO! 24L

LOGO! 24RCL
LOGO! 24RCLB11

Number

Output type

Transistor, current
sourcing

Relay outputs

Electrical isolation

No

Yes

Digital outputs

In groups of

Activation of digital input

Yes

Output voltage

 Supply voltage

Output current

Max. 0.3 A

Yes

Continuous current Ith (per

connector)

Max. 10 A

Incandescent lamp load

(25,000 switching cycles) at

1000 W

Fluorescent tubes with electr.

control gear (25,000 switching cycles)

10 x 58 W

Fluorescent tubes, conventionally compensated (25,000

switching cycles)

1 x 58 W

Fluorescent tubes, uncompensated (25,000 switching

cycles)

10 x 58 W

Short circuitproof and overloadproof

Yes

Shortcircuit current limitation

Approx. 1 A

Derating

None throughout
the entire temperature range

Short circuitproof cos 1

LOGO! Manual
A5E00067781 01

None throughout
the entire temperature range
Power protection
B16
600A

197

Technical Specifications
LOGO! 24L
Shortcircuit proof cos 0.5 to
0.7
Parallel switching of outputs
to increase power

LOGO! 24RCL
LOGO! 24RCLB11
Power protection
B16
900A

Not permitted

Protection of output relay (if

desired)

Not permitted
Max. 16 A,
characteristic B16

Switching rate
Mechanical

10 Hz

Electrical

10 Hz

Ohmic load/lamp load

10 Hz

2 Hz

Inductive load

0.5 Hz

0.5 Hz

ASi slave connection(LOGO! 24RLCB11 only)

ASi profile

7.F

 I/O config
 ID code

7h

Number of virtual digital inputs

Number of virtual digital outputs

Power supply

ASi power supply

unit

Power consumption

Typically 30 mA

Electrical isolation

Yes

Reverse polarity protection

Yes

198

Fh

LOGO! Manual
A5E00067781 01

Technical Specifications

A.5 Technical Specifications: LOGO! 12...

LOGO! 12RCL

LOGO! 12/24RC
LOGO! 12/24RCo

Input voltage

12 V DC

12/24 V DC

Permissible range

10.8 ... 15.6 V DC

10.8 ... 15.6 V DC

20.4 ... 28.8 V DC

Power consumption

10 ... 165 mA
(from 12 V DC)

10 ... 120 mA
(from 12/24 V DC)

Voltage failure bridging

Typically 5 ms

Typically 5 ms

Power loss

0.1 ... 2.0 W

(at 12 V DC)

0.1 ... 1.2 W

(at 12/24 V DC)

Clock buffering at 25 C

Typically 80 h

Typically 80 h

Accuracy of the realtime

clock

Max. 5 s a day

Max. 5 s a day

Electrical isolation

No

No

Reverse polarity protection

Yes

Yes

Number

12

Electrical isolation

No

No

< 4 V DC

< 5 V DC

> 8 V DC

> 8 V DC

< 0.5 mA

< 1.0 mA (I1...I6)

, mA (I7,
( , I8))
< 0,05

Power supply

Digital inputs

Input voltage L+

 Signal
g
0
 Signal 1
Input current at

 Signal 0
 Signal 1

> 1.5 mA

> 1.5 mA (I1...I6)

> 0,1 mA (I7, I8)

Delay time at

 0 after 1
 1 after 0
LOGO! Manual
A5E00067781 01

Typically
y
y 1.5 ms

Typically
y
y 1.5 ms

Typically 1.5 ms

Typically 1.5 ms

199

Technical Specifications

Line length (unshielded)

LOGO! 12RCL

LOGO! 12/24RC
LOGO! 12/24RCo

100 m

100 m

Analog inputs
Number

2 (I7, I8)

Range

0 ... 10 V DC

Max. input voltage

28.8 V DC

Digital outputs
Number

Output type

Relay outputs

Relay outputs

Electrical isolation

Yes

Yes

In groups of

Activation of digital input

Yes

Yes

Continuous current Ith (per

connector)

Max. 10 A

Max. 10 A

Incandescent lamp load

(25,000 switching cycles) at

1000 W

1000 W

Fluorescent tubes with electr.

control gear (25,000 switching cycles)

10 x 58 W

10 x 58 W

Fluorescent tubes, conventionally compensated (25,000

switching cycles)

1 x 58 W

1 x 58 W

Fluorescent tubes, uncompensated (25,000 switching

cycles)

10 x 58 W

10 x 58 W

Output voltage
Output current

Short circuitproof and overloadproof

Shortcircuit current limitation

200

LOGO! Manual
A5E00067781 01

Technical Specifications
LOGO! 12RCL

LOGO! 12/24RC
LOGO! 12/24RCo

Derating

None throughout
the entire temperature range

None throughout
the entire temperature range

Short circuitproof cos 1

Power protection
B16
600A

Power protection
B16
600A

Shortcircuit proof cos 0.5 to

0.7

Power protection
B16
900A

Power protection
B16
900A

Parallel switching of outputs

to increase power

Not permitted

Not permitted

Protection of output relay (if

desired)

Max. 16 A,
characteristic B16

Max. 16 A,
characteristic B16

10 Hz

10 Hz

Ohmic load/lamp load

2 Hz

2 Hz

Inductive load

0.5 Hz

0.5 Hz

Switching rate
Mechanical
Electrical

LOGO! Manual
A5E00067781 01

201

Technical Specifications
Switching capacity and service life of the relay outputs
Ohmic load
Switching cycles/million
12/24 V AC/DC
115/120 V AC
230/240 V AC

0.5
0.4

Maximum 10 A
Maximum 10 A
Maximum 10 A

0.3
0.2
0.1

10

Switched current/A

Figure A Switching capacity and service life of the contacts at ohmic load
(heating)

Inductive load
Switching cycles/million
12/24 V AC/DC
115/120 V AC
230/240 V AC

1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1

Maximum 2 A
Maximum 3 A
Maximum 3 A

3
Switched current/A

Figure B Switching capacity and service life of the contacts at highly inductive load to IEC 947-5-1 DC13/AC15 (contactors, solenoid coils,
motors)

202

LOGO! Manual
A5E00067781 01

Technical Specifications

A.6 Technical Specifications:

LOGO!Power 12 V
LOGO! Power 12 V is a switchedmode primary power
supply unit for LOGO! devices. Two current intensities are
available.
LOGO! Power
12 V / 1.9 A

LOGO! Power
12 V / 4.5 A

Input data
Input voltage

120 ... 230 V AC

Permissible range

85 ... 264 V AC

Permissible mains frequency

47 ... 63 Hz

Voltage failure bridging

> 40 ms (at 187 V AC)

Input current

0.3 ... 0.18 A

0.73 ... 0.43 A

Making current (25C)

 15 A

 30 A

Device protection

Internal

Recommended circuit
> 6 A characteristic D
breaker (IEC 898) in mains in- > 10 A characteristic C
feed
Output data
Output voltage

12 V DC

Overall tolerance

+/- 3 %

Adjustment range

11.1 ... 12.9 V DC

Residual ripple

< 200 mVSS

Output current
Overcurrent limiting

1.9 A

4.5 A

2.4 A

4.5 A

Efficiency

 80 %

Parallel switching to increase

power

Yes

Electromagnetic compatibility
Interference suppression

EN 500811, EN 55022 Class B

Interference immunity

EN 50082-2

LOGO! Manual
A5E00067781 01

203

Technical Specifications
LOGO! Power
12 V / 1.9 A

LOGO! Power
12 V / 4.5 A

Safety
Electrical isolation, primary/
secondary

Yes, SELV (to EN 60950/VDE 0805)

Safety class

II (to IEC 536/VDE 0106 T1)

Type of protection

IP 20 (to EN 60529/VDE 470 T1)

CE marking

Yes

UL/CSA certification

Yes UL 508 / CSA 22.2

FM approval

In preparation

General details
Ambient temperature range

20 ... +55C, natural convection

Storage and transport temperature

- 40 ... +70C

Connections on input

One connector (1x2.5mm2 o. 2x 1.5 mm2 )

each for L1 and N

Connections on output

Two connectors (1x2.5mm2 o. 2x 1.5 mm2)

each for L+ and M

Installation

On 35 mm DIN rail, snapon

Dimensions in mm (WxHxD)

72 x 80 x 55

126 x 90 x 55

Approx. weight

0.2 kg

0.4 kg

204

LOGO! Manual
A5E00067781 01

Technical Specifications

A.7 Technical Specifications:

LOGO!Power 24 V
LOGO! Power 24 V is a switchedmode primary power
supply unit for LOGO! devices. Two current intensities are
available.
LOGO! Power
24 V/1.3 A

LOGO! Power
24 V/2.5 A

Input data
Input voltage

120 ... 230 V AC

Permissible range

85 ... 264 V AC

Permissible mains frequency

47 ... 63 Hz

Voltage failure bridging

40 ms (at 187 V AC)

Input current

0.48 ... 0.3 A

0.85 ... 0.5 A

Making current (25C)

< 15 A

< 30 A

Device protection

Internal

Recommended circuit
> 6 A characteristic D
breaker (IEC 898) in mains in- > 10 A characteristic C
feed
Output data
Output voltage

24 V DC

Overall tolerance

+/- 3 %

Adjustment range

22.2 ... 25.8 V DC

Residual ripple

< 250 mVSS

Output current
Overcurrent limiting

1.3 A

2.5 A

1.6 A

2.8 A

Efficiency

> 80 %

Parallel switching to increase

power

Yes

Electromagnetic compatibility
Interference suppression

EN 500811, EN 55022 Class B

Interference immunity

EN 50082-2

LOGO! Manual
A5E00067781 01

205

Technical Specifications
LOGO! Power
24 V/1.3 A

LOGO! Power
24 V/2.5 A

Safety
Electrical isolation, primary/
secondary

Yes, SELV (to EN 60950/VDE 0805)

Safety class

II (to IEC 536/VDE 0106 T1)

Type of protection

IP 20 (to EN 60529/VDE 470 T1)

CE marking

Yes

UL/CSA certification

Yes UL 508 / CSA 22.2

FM approval

Yes Class I, Div. 2, T4

General details
Ambient temperature range

20 ... +55C, natural convection

Storage and transport temperature

40 ... +70C

Connections on input

One connector (1x2.5mm2 o. 2x 1.5 mm2 )

each for L1 and N

Connections on output

Two connectors (1x2.5mm2 o. 2x 1.5 mm2)

each for L+ and M

Installation

On 35 mm DIN rail, snapon

Dimensions in mm (WxHxD)

72 x 80 x 55

126 x 90 x 55

Approx. weight

0.2 kg

0.4 kg

206

LOGO! Manual
A5E00067781 01

Technical Specifications

A.8 Technical Specifications:

LOGO! Contact 24/230
LOGO! Contact 24 and LOGO! Contact 230 are switching
modules for the direct switching of ohmic loads of up to 20
A and motors of up to 4 kW (without noise emission, hum
free).

Operating voltage

LOGO!
Contact 24

LOGO!
Contact 230

24 V DC

230 V AC;
50/60 Hz

Switching capacity
Utilization category AC-1: Switching of
ohmic load at 55C

85 ... 264 V
(derating at <93 V)

Operating current at 400 V

20 A

Output of threephase loads at 400 V

13 kW

Utilization category AC-2, AC-3: Motors 85 ... 264 V

with slipring or squirrelcage rotor
(derating at <93 V)
Operating current at 400 V

8.4 A

Output of threephase loads at 400 V

4 kW

Shortcircuit protection:
Assignment type 1

25 A

Assignment type 2

10 A

Connecting leads

Finely stranded with wire end ferrules

singlecore
2x (0.75 to 2.5) mm2
2x (1 to 2.5) mm2
1 x 4 mm2

Dimensions (WxHxD)

36 x 72 x 55

Ambient temperature

-25 ... +55C

Storage temperature

-50 ... +80C

LOGO! Manual
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207

B Determining Memory
Requirements
Use of memory areas
If you are unable to enter another block when you are entering a program, this means a memory area is completely
occupied. LOGO! only offers you the blocks that will still fit
into LOGO!. If no more blocks from a list fit into LOGO!,
you will not be able to select the list again.
If a memory area is occupied, you have to optimize your
circuit or use a second LOGO!.
Determining the amount of memory required
When you calculate the memory requirements of a circuit,
you must always include all the individual areas of the
memory.
Example:
Par RAM Timer REM

Par RAM Timer REM

B03

B02
B01

No 1
No 2
No 3

Q1

x
I2

B04
I1
T
B06

B05
I3
I4
x

208

Q2

LOGO! Manual
A5E00067781 01

Determining Memory Requirements

The example program consists of the following:
Block
no.

Memory area

Function
Par

RAM

Timer

REM

Blocks

B01

OR

B02

AND

B03

Time switch

B04

On delay

B05

Clock pulse generator

B06

AND

Resources occupied by the

program

Memory limitations in LOGO!

48

27

16

15

56

Still available in LOGO!

40

23

14

15

50

The program therefore fits into LOGO!.

LOGO! Manual
A5E00067781 01

209

C Determining the Cycle Time

The program cycle is the complete execution of the program, primarily the reading in of the inputs, the processing
of the program and the subsequent reading out of the outputs. The cycle time is the time required to execute a program once in full.
The time required for a program cycle can be determined
using a short test program. The test program is created in
LOGO! and produces a value during processing in parameterization mode from which the current cycle time can be
calculated.
Test program
1. Create the test program by linking an output or marker
to a threshold switch and by switching a clock pulse
generator at its input, which is switched on by a hi signal.
B02
B01
Hi
Output Q

T
Par

Qx

or
Memory
marker M

2. Parameterize the two blocks as shown below. A clock

pulse is generated in each program cycle based on the
cycle time of 0 seconds. The time interval of the threshold switch is set to 2 seconds.

B02:T
T =00.00s+

210

B01:Par
SW=1000+
SW=0000
G_T=02.00s

LOGO! Manual
A5E00067781 01

Determining the Cycle Time

3. Then start the program and switch LOGO! to parameterization mode. You can look at the parameters for the
threshold switch in parameterization mode.

B01:Par
SW=1000+
SW=0000
fa =0086

fa= is the sum of the

pulses measured per
time unit G_T

4. The inverse value of fa is equal to the cycle time of

LOGO! with the current program stored in the memory.
1/fa = cycle time in s
Explanation
The clock pulse generator (T=0) changes its output signal
every time the program is executed. A level (high or low)
thus lasts exactly one cycle. A period therefore lasts 2
cycles.
The threshold switch indicates the ratio of periods per 2
seconds which results in the ratio of cycles per second.
Edge change of clock pulse generator
each time the program is executed

Cycle time
1 period = 1 pulse = 2 cycles
Periods

LOGO! Manual
A5E00067781 01

211

D LOGO! Without a Display

The LOGO! 12/24RCo, LOGO! 24RCo and
LOGO! 230RCo variants without a display were developed
because some special applications dont need operating
units such as keypads and a display during operation.
I1 I2 I3 I4 I5 I6

1 LN

SIEMENS
RUN/STOP

LOGO! 230RC0
Output 4 x relay/10A
Q1

Q2

Q3

Q4

Less is definitely more!

The advantages for you:
 More cost-efficient than with an operating unit.
 Require less space in the cabinet than conventional
hardware.
 Considerably more flexible and less costly than separate hardware units.
 Advantageous for applications in which two or three
conventional switching devices can be replaced.
 Very easy to use.
 Cannot be used by unauthorized persons.
 Compatible with LOGO! basic variants.

212

LOGO! Manual
A5E00067781 01

LOGO! without a Display

Programming without an operating unit
There are two ways to program LOGO! without a display:
 Create a program with LOGO! software on the PC and
transfer the program to LOGO!
 Transfer the program from a LOGO! program module/
card to your LOGO! without a display.
Operating characteristics
Once the power supply has been connected, LOGO! is
ready for operation. You can switch off LOGO! without a
display by disconnecting the power supply, for example by
removing the plug.
You cant use a key combination to set up LOGO! RCo variants for data transfer, and similarly programs cant be
stopped or started using keys. LOGO! RCo variants therefore have modified startup characteristics:
Startup characteristics
If a LOGO! program module/card is inserted, a program
stored there will be copied to the device immediately after
LOGO! has been switched on, thus overwriting an existing
program.
If a PC cable is inserted, LOGO! automatically goes into
PC
LOGO mode when it is switched on. Using the PC
software LOGO!Soft and LOGO!Soft Comfort you can read
the programs from LOGO! or store them on LOGO!.
If there is already a valid program in the program memory,
LOGO! will automatically transfer from STOP to RUN after
power has been switched on.

LOGO! Manual
A5E00067781 01

213

LOGO! without a Display

Operating status indicator
Operating statuses, such as Power On, RUN and STOP
are indicated by an LED on the front hood.
 Red LED:
PowerOn/STOP
 Green LED:
PowerOn/RUN
After the power supply has been switched on and whenever LOGO! is not in RUN mode, the red LED comes on.
When LOGO! is in RUN mode, the green LED comes on.

214

LOGO! Manual
A5E00067781 01

E LOGO! ...LB11:
Active-Passive Switchover
All LOGO!...B11 variants are factory-set to address 0.
When the master is assigning addresses, only one active
slave may be set to address 0 on the ASi bus at any one
time. All the other slaves with address 0 must be passive
i.e. unknown on the bus.

Caution
The ASi address can be changed 10 times for
each LOGO! ...LB11 variant.
Additional changes are not guaranteed.

To enable you to switch LOGO!...B11 to passive, we have

integrated a menu item in the programming menu.
Switching LOGO! ...B11 between active and passive
1. Switch LOGO!...B11 to programming mode (using the
3-finger grip) and then press OK to get directly into the
programming menu.
2. Press the key three times
The cursor (>) is now positioned at the start of the
ASi_BUS.. line

Edit Prg
Clear Prg
Set Clock
>ASi_BUS..

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A5E00067781 01

215

LOGO! ...B11: Active-Passive Switchover

3. Press OK. The following display appears:

> Active
Passive
LOGO:
Active
4. Switch LOGO!...B11 to passive by pressing the key
and then OK. The display indicates the new state

LOGO:
Passive
5. As soon as the master has recognized an active slave
and assigned it an address, you can switch another
slave back from passive to active.
Note
You can only exit the menu for switching between active
and passive if LOGO! is switched to active.

216

LOGO! Manual
A5E00067781 01

F LOGO! Menu Structure

>Program..

>Edit Prg
Q1

>Clear Prg

>PC/Card..

Clear Prg
No
Yes

>Set Clock

Set Clock
We 08:31
MM.DD.YY
01.11.00

>ASi_Bus..

Active
Passive
LOGO:
Active

>PC<->LOGO

PC<->LOGO
Stop?
Press ESC

>LOGO->Card
#
>Card->LOGO
#

>Start

I:12345678
9 10 11 12
We 08:44
Q:12345678
= optional menus

LOGO! Manual
A5E00067781 01

ASi_Bus
Ia : 1234
Qa : 1234
Bus: Off

n times
message
texts
n = 0..5

217

Order Numbers
Table A
Designation

Variant
Standard
Without display

Analog input
Long

Bus

Order number

LOGO! 24RC

6ED1 052-1HB00-0BA2

LOGO! 230RC

6ED1 052-1FB00-0BA2

LOGO! 12/24RCo *

6ED1 052-2MD00-0BA2

LOGO! 24RCo

6ED1 052-2HB00-0BA2

LOGO! 230RCo

6ED1 052-2FB00-0BA2

LOGO! 12/24RC

6ED1 052-1MD00-0BA2

LOGO! 24

6ED1 052-1CC00-0BA2

LOGO! 12RCL

6ED1 053-1BB00-0BA2

LOGO! 24L

6ED1 053-1CA00-0BA2

LOGO! 24RCL

6ED1 053-1HB00-0BA2

LOGO! 230RCL

6ED1 053-1FB00-0BA2

LOGO! 24RCLB11

6ED1 053-1HH00-0BA2

LOGO! 230RCLB11

6ED1 053-1FH00-0BA2

*: Also with analog inputs

218

LOGO! Manual
A5E00067781 01

Order Numbers
Table B
Designation

Accessories
Software

Order number

LOGO!Soft Comfort V2.0

6ED1 058-0BA00-0YC1

Comfort update from 1.0 to

2.0

6ED1 058-0CA00-0YC0

Program
modules

Yellow card

6ED1 056-1BA00-0AA0

Red card

6ED1 056-4BA00-0AA0

Switching
module

LOGO!Contact 24 V

6ED1 057-4CA00-0AA0

LOGO!Contact 230 V

6ED1 057-4EA00-0AA0

Power modules

LOGO!Power 12V/1.9A

6EP1 321-1SH01

LOGO!Power 12V/4.5A

6EP1 322-1SH01

LOGO!Power 24V/1.3A

6EP1 331-1SH01

LOGO!Power 24V/2.5A

6EP1 332-1SH41

PC cable

6ED1 057-1AA00-0BA0

Manual

6ED1 050-1AA00-0BE3

Others

LOGO! Manual
A5E00067781 01

219

Abbreviations
B01
B11
BF
BN
C
Cnt
Co
Dir
En
L
No
o
Par
R
R
S
SF
T
Trg

220

Block number B01

LOGO! device designation: ASi bus connection
Basic functions
Block number
LOGO! device designation: integrated clock
Count = input for counter
Connector
Direction (e.g. for counter)
Enable (e.g. for switching on the clock pulse
generator)
LOGO! device designation: long variant
Cams (time switch parameters)
LOGO! device designation: without display
Parameter
Reset
LOGO! device designation: relay outputs
Set (e.g. setting the latching relay)
Special functions
Time (parameter)
Trigger (parameter)

LOGO! Manual
A5E00067781 01

Index
Symbols
?, on the display, 57

Numbers
3-finger grip, 36
4 golden rules, 36

A
Active, 215, 217
Active-passive, 215
switchover, 215, 217
Analog
comparator, 118
inputs, 63
values, 76

B
Basic functions, 65
AND, 67
with edge, 67
NAND, 68
with edge, 69
NOR, 70
NOT, 71
OR, 69
XOR, 71
BF, 62, 65
Block, 30
deleting, 55
interconnected blocks, 56
inserting, 50
number, 30
assigning, 31
BN, 62
Bus connection cable, 22

AND, 67
AND not, 68
Applications, 150

AS interface, 3

CE marking, 6

ASi
bus, 21
master, 21
system, 21

Certification, 6

ASi inputs, 63
Asynchronous pulse generator,
110

LOGO! Manual
A5E00067781 01

Checking, 53
Circuit diagram, 33
Circuit state change, 15
Clock pulse generator, symmetrical, 108

221

Index
Co, 62, 63

Dimensions, 10

Connecting
inputs, 14
outputs, 19

DIN rail, 10

Connection inputs, 73
Connectors, 28, 63, 64
hi, 29
inputs, 29
lo, 29
LOGO!s, 29
outputs, 29
x, 29, 73

Display, 31
Display image, 31
Displaying, 53
drag and drop, 146
Dual-function switch, 124

Constants, 63

Editing, 50

Control panel, 3

Cursor, 37

Example
automatic door, 156
fluorescent luminaires, 177
further applications, 185
industrial gate, 168
activation, 172
surveillance, 172
lighting
hall, 151
stairwell, 151
ventilation system, 163
water pump, 181

Cursor movement, 37

Exclusive OR, 71

Cycle time, 210

Exiting programming mode, 53

Control program, 59
Correcting typing errors, 57
Counter
operating hours, 105
up/down, 102
CSA, 6
Current impulse relay, 90

Day of the week, 96

Fast inputs, 15

Degree of protection, 76

FM, 6

Demo versions, 146

Frequency functions, 15

Device types, LOGO!, 2

Function blocks, 30

Diagram overview, 32

222

LOGO! Manual
A5E00067781 01

Index
Functions, 62

Limitations, 59

Fundamentals of special functions, 72

List
BF, 62
BN, 62
Co, 62
SF, 62

G
Gain, 76
Golden rules, 36
Ground terminal, 13

H
Hiding, 53

I
Input connection, 14

Logic module, 1
LOGO!
connecting to a PC, 148
guidelines, 8
installing, 10
on the ASi bus, 22
operating modes, 26
recognizing, 4
removing, 10
structure of, 3
switching on, 24
variants, 5
wiring, 12

Inputs, 63

LOGO! software, 145

installation, 147

Inserting, 50

LOGO!s menu, 38

Installation, 147

LOGO!Soft Comfort, 146

Internet address, 150

Interval time-delay relay
edge-triggered, 94
pulse output, 92
Inverter, 71

L
Latching relay, 88
LCD, 3
LED, 214
Levels, 64
LOGO! Manual
A5E00067781 01

M
Markers, 64
Memory
area, 59
requirements, 208
utilization, 60
Memory requirements, 208
Menu structure, 217
Message texts, 126
Mode

223

Index
parameterization, 130
parameterizing, 38
programming, 38
Modules, 10

N
NAND, 68
Negation, 71
Nesting depth, 59, 61

Outputs, 63

P
Par, 59
Parameter
displaying/hiding, 53
selecting, 131
setting, 129
T, 74

NOR, 70

Parameter assignment window,

96, 127

NOT, 71

Parameterizing, 52

Parameters
changing, 132
inputs, 74

Off delay, 82

Passive, 215, 217

Off time, 97

Passive-active, 215

Offset, 76

PC cable, 148

On delay, 80
retentive, 86

PC
LOGO, 148

On time, 97

Planning, 37

On/off delay, 84

Power
off, 24
on, 24
switch, 24

Open connectors, 64
Operating
characteristics, 213
operating status indicator,
214
Operating hours, counter, 105
Operation, 147
OR, 69
OR not, 70
Output connection, 19
224

PC
LOGO mode, 148

Power supply
connecting, 12
resumption, 24
Program cycle, 210
Program module
copying, 142
inserting, 139, 140
red, 137

LOGO! Manual
A5E00067781 01

Index
removing, 139, 140
yellow, 137

Program path, 61

Sensor attributes, 14

Programming software, 145

Setting, 52

Programs
archiving, 137
changing, 49
deleting, 58
duplicating, 137
entering, 42
sending by post, 137

Setting the time, 135

Pulse
duration, 110
interpulse period, 110

Simulation, 145

Pulse generator, asynchronous,

110
Pulse output, 92

R
RAM, 59
Random generator, 111
Relay outputs, 19, 202
service life, 202
switching capacity, 202
REM, 59
Resources, 59
Retentive on delay, 86
Retentivity, 75
RLO edge detection, 67, 69
Rules, 4 golden, 36

Seven-day time switch, 4, 95,

97
examples, 98
setting, 97
SF, 62, 77
Size of a circuit, 59
Slave, 4
Special functions, 77
analog comparator, 118
clock pulse generator, symmetrical, 108
counter
operating hours counter, 105
up/down, 102
delay
off, 82
on, 80
on/off, 84
retentive on, 86
fundamentals, 72
interval time-delay relay
edge-triggered, 94
pulse output, 92
message texts, 126
pulse generator, asynchronous, 110
random generator, 111
relay
current impulse, 90

RUN, 46

LOGO! Manual
A5E00067781 01

225

Index
latching, 88
switch
dual-function, 124
stairwell light, 122
time switch
seven-day, 95
twelve-month, 100
trigger
analog, 115
frequency, 113

LOGO! 230...., 190

LOGO! 24 Basic, 193
LOGO! 24 Long, 196
LOGO!Contact, 207
LOGO!Power 12 V, 203
LOGO!Power 24 V, 205
Terminal block, 61
Time, accuracy, 75
Time error, 75

Stairwell light switch, 122

Time response, 74

Startup characteristics, 213

Startup flags, 64

Time switch, 1
accuracy, 75

Storage, space, 59

Timer, 59

Summer time, 136

Transistor outputs, 20

Switch
dual-function, 124
stairwell light, 122

Trigger
analog, 115
frequency, 113

Switched current, maximum, 20

Twelve-month time switch, 100

Switching, summer and winter

time, 136

Two-wire lead, 21
Type of protection, 53

Switchover, active-passive,
215, 217

Symbols, 4
Symmetrical clock pulse generator, 108

UL, 6
Up/down counter, 102
Upgrade, 146
Upward compatibility, 139

T. See time
Technical Specifications, 188
Technical specifications
general, 188
LOGO! 12...., 199

226

V
Voltage levels, 64

LOGO! Manual
A5E00067781 01

Index

W
Warning duration, 123

X
XOR, 71

Warning time, 123

Winter time, 136
Wire end ferrules, 12
Without display, 212

LOGO! Manual
A5E00067781 01

Z
Zero point, 76

227