Cat. No.

E301-E1-1A

F3S-A Series
Safety Light Curtain
Introduction
Thank you for purchasing the F3S-A Series Safety Light Curtain (hereafter referred to as the F3S-A). The
F3S-A was developed using advanced technologies and long-standing experience, and this manual describes
the procedure that will ensure its proper use. Always heed the following points when using the F3S-A:
• Make sure that personnel operating the F3S-A are knowledgeable about the machine on which it is installed.
• Read this manual completely and be sure you understand the information provided before attempting to oper-
ate the F3S-A.
• Keep the manual in a safe, convenient location and refer to it as necessary.

Regulations and Standards

1. The F3S-A has not received the type approval provided by Article 44-2 of the Industrial Safety and Health Law
of Japan.
Therefore it cannot be used in Japan as a safety device for the pressing or shearing machine provided by Ar-
ticle 42 of that law.
2. (1) The F3S-A is electro-sensitive protective equipment (ESPE) in accordance with European Union (EU) Ma-
chinery Directive Annex IV, B. Safety Components, Item 1.
(2) The F3S-A complies with the foreign regulations and standards below.
(1) EU regulations
- Machinery Directive: No. 98/37/EC
- EMC Directive: No. 89/336/EEC
(2) EN standards (European standards)
- EN61496-1 (TYPE 4 ESPE), IEC61496-2 (TYPE 4 AOPD)
Note EC Type-Examination is based on IEC61496-2 because EN61496-2 has not been published as
of May 1999.

(3) International standards

- IEC61496-1 (TYPE 4 ESPE), IEC61496-2 (TYPE 4 AOPD)
(3) The F3S-A received approvals as shown below from the EU accredited body TÜV Rheinland Product Safe-
ty GmbH.
- Certificate of a Notified Body for EC Type-Examination provided by Machinery Directive (Type 4 ESPE)
- Certificate of a Competent Body provided by EMC Directive
- TÜV Rheinland Type Approval TYPE 4 ESPE (EN61496-1)
TYPE 4 AOPD (EC61496-2)
Applications: EN954-1 Category B, 1, 2, 3, 4
(4) The F3S-A received approvals as shown below from the third-party testing laboratory UL.
- UL Listed
- UL Listed to Canadian safety standards
Both for TYPE 4 ESPE (IEC61496-1)
TYPE 4 AOPD (IEC61496-2)
Note IEC61496-1 and -2 are applied standards to UL instead of draft UL subject 491
and draft UL subject 2496.
UL IEC-based standards are expected to be published as UL61496-1 and -2
soon.
- Programmable system certificate (UL1998, IEC61496-1)
3. The following standards are referenced when designing the F3S-A. To comply with these standards, be sure to
design and use in accordance with all regulations and standards related to them.
Contact an expert agency such as TÜV and UL if any of the above points are unclear.

iii
 - EN415-4, prEN691, EN692, prEN693
- OSHA 29 CFR 1910. 212
- OSHA 29 CFR 1910. 217
- ANSI B11.1 to B11.19
- ANSI/RIA 15.06

Precautions in Using the Product

The F3S-A conforms to the EU Machinery Directive and EMC Directive. However, no test has been performed
to confirm whether the F3S-A conforms to other directives, rules, and standards that are required for other
applications. When using the F3S-A under the following applications, be sure to refer to relevant regulations
and standards and perform tests on the system incorporating the F3S-A according to the requirements speci-
fied in these regulations and standards in order to confirm compliance. If there are any questions about the
relevant regulations and standards, contact TÜV Rheinland Product Safety GmbH in Germany or any other
institute concerned.

(1) When using the F3S-A under conditions or environments not described in this manual.

(2) When using the F3S-A on machines or systems applied in life-threatening situations (nuclear power con-
trol, railroads, aircraft, automobiles, combustion facilities, medical systems, aerospace development, or
large amusement machines).

Precautions on Safety

F Conventions for Safe Use

The following conventions are used for precautionary items in this manual in order to ensure safe and proper
use of the F3S-A. Items listed here are critical for safety and must be heeded at all times.

! WARNING Indicates a potentially hazardous situation which, if not avoided,

could result in death or serious injury.

Indicates prohibited actions.

iv
 ! WARNING
Do not use the F3S-A on machines that cannot be stopped by electrical control in an emergency. For instance, the
F3S-A may not be used on machines using full-revolution clutches.
When using the F3S-A on PSDI (Presence Sensing Device Initiation) mode, the appropriate control circuit shall be
installed between the F3S-A and the machinery.
For further information on PSDI, please refer to OSHA 1910.217, IEC61496-1, and other relevant standards and regula-
tions.
Always maintain a safety distance between the F3S-A and dangerous machine parts (see 3-1 Installation Conditions).
Serious injury may result if the machine does not stop before someone reaches a dangerous part.
Install the F3S-A so that some part of the operator’s body remains in the detection zone at all times when operating in
dangerous machine parts (see 3-1 Installation Conditions).
Install protective structures around the machine so that you must pass through the detection zone to reach dangerous
machine parts (see 3-1 Installation Conditions).
Do not install the F3S-A in a location affected by wall reflections (see 3-1 Installation Conditions).
Failure to do so may cause detection to fail and result in serious injury.
When installing multiple F3S-A sets, connect the sets or install some barriers to prevent mutual interference (see 3-2
Configuration).
Always use a correct combination of emitters and receivers (see 3-2 Configuration).
Failure to do so may create undetectable zones.
Be sure to wire correctly. Parallel connection or mixed connection may cause detection to fail or cause mutual interfer-
ence (see 3-5 Wiring).
Do not short the output lines to the +24V line. Doing so will cause the output to be always ON, creating a dangerous
situation.
Be sure to use both output lines when constructing the safety system. The safety system constructed using only one line
may result in serious injury under a faulty condition of the output circuit.
Connect a load between the output and 0V line. If a load is mistakenly connected between the output and +24V line, the
operating mode will switch to the mode in which output is turned ON when light is interrupted (see 3-5 Wiring), creating
a dangerous situation.
Do not use the F3S-A in a retroreflective configuration. Otherwise detection may fail.

Retroreflective panel

Notes
For your safety, always heed the following:
(1) DC power supply units must satisfy all the conditions below.
• The power supply is connected to the F3S-A only and not to other devices or machines.
• The power supply voltage is within the rating (24 VDC ±10%).

v
 • The power supply conforms to EMC Directive (industrial environment).
• The power supply conforms to Low-voltage Directive.
• The power supply conforms to UL508 (output current is less than 8A) or UL1310.
• The power supply uses double or reinforced insulation between the primary and secondary circuits.
• The power supply automatically resets overcurrent protection characteristics (voltage drop).
• The power supply maintains an output holding time of at least 20 ms.
• When using a commercially available switching regulator, make sure FG (frame ground terminal) is connected
to PE (protective earth). Faulty operation caused by switching noise may result if the terminal is not connected.
• Use one of the following wiring configurations to reduce noise terminal voltage to the primary side of the power
supply.
- Connect the 0V line to PE (protective earth).
- Mount a capacitor with a minimum 47-nF capacity and minimum 630 V voltage rating between the 0V
line and PE.
• Recommended power supplies: S82K, S82J, S82F or S82F-P made by OMRON.

(2) Loads must satisfy all the conditions below.

• Is not shorted
• Does not use current higher than the rating.
• Is double insulated as shown in the figure below to protect the load from hazardous voltage levels when the
load is a relay. The basic insulation shown in the following illustration should insulate against hazardous volt-
age levels (230 VAC, etc.), not simply against 24 VDC.

Double insulation

Basic insulation Note This part of the insulation provides

Output (black (See note.) Basic insulation
and white) supplementary insulation against
hazardous voltage levels.
F3S-A 0 V (blue)
+24 V (brown)
K1 K1 K2 K2 Motor, etc.
Power
Power Supply
Supply Unit 2
Unit 1
Hazardous voltage level

Reinforced Basic insulation

insulation
or double
insulation
Hazardous Hazardous
voltage level voltage level

(3) Be sure to conduct inspections regularly (see Section 6 Maintenance).

(4) Do not use the F3S-A in environments exposed to flammable or explosive gases.

(5) Do not disassemble, repair or modify the F3S-A.

(6) Make sure the F3S-A, cap screws and cord connectors are mounted securely.

(7) Do not connect the F3S-A to an AC power supply.

(8) Be sure to dispose of the F3S-A as industrial waste.

vi
 Notice

Failure to observe the following items may result in F3S-A damage, deterioration or improper operation.

J Installation Environment
• Do not install the F3S-A in the following environments:
- Areas exposed to intense interference light such as direct sunlight.
- Areas with high-humidity where condensation is likely to occur.
- Areas exposed to corrosive gases.
- Areas exposed to vibration or shock levels higher than specification provisions.
- Areas exposed to contact with water.
• Do not use cellular phones or transceivers near the F3S-A.

J Wiring and Mounting

• Be sure to turn OFF the power prior to wiring. Otherwise the diagnostic function may prevent the sensor from
operating.
• Be sure to use shielded twisted-pair cables (cross-section at least 0.2 mm2 in diameter) when extending the
sync line without using an F39-JAjA extension cord.
• When using resin or other connectors in place of the unit’s metal connector, make sure the conductor path in
the connector is rated IP54 or higher.
• Check signal names for all terminals and wire terminals correctly.
• When using two or more F3S-A sets, be sure to connect a sync line and the same power supply unit to all F3S-
As. (Turn ON all power supplies at the same time (within 0.5 s) if separate power supply units are used for each
F3S-A.) Never exceed specifications for the total number of sets and total number of optical axes.
• The F3S-A will start operating in five seconds after the power is turned ON. Make sure that no faulty operation
will occur in the control system.
• Once power is turned ON, do not turn it OFF again before the F3S-A becomes operational (LED indicator
lights).
• Be sure to route F3S-A wires separated from high-potential power lines or through an exclusive conduit.
• Make sure the emitter and receiver are facing the proper direction.
• Use the interference light search function for no longer than 8 hours from startup, otherwise the F3S-A will
switch to OFF-hold condition (stop due to temporary sensor failure).

J Do not use thinners, benzene or acetone to clean the F3S-A because they will dissolve resin and paint.

J Do not use screw locking adhesives (screw lock) to secure the cap unit or cord cap screws because the adhe-
sive may cause the resin to deteriorate and crack.

J The detector unit cannot detect transparent or semi-transparent materials.

J After unpacking the emitter and receiver that are packed together, install them opposite each other.

vii
 Prior to Use
Make sure the following items were delivered, and contact your nearest OMRON representative or dealer if
any item is missing.
• F3S-A Unit x 1 (emitter x 1, receiver x 1)
• Mounting brackets (top and bottom) x 4

Eight M5 × 8 screws

Four L-shaped brackets

Four U-shaped brackets

Four M6 square nuts

Four M6 × 45 screws

• Mounting brackets (intermediate) x 2

(only with the F3S-A322 and F3S-A482)

Two M4 × 10 screws

Two L-shaped intermediate brackets

Two U-shaped intermediate brackets

Two M6 × 8 screws

• Test rod x 1

For the F3S-Ajj1

15 mm dia. (No.2988969-9)

For the F3S-Ajj2

25 mm dia. (No.2988970-2)

• Instruction Manual (this manual) x 1

viii
 SECTION 1
Description
The F3S-A Safety Light Curtain is a multi-axis transmission-type light curtain developed with microprocessor
technology. It is used to stop a production machine immediately when any part of the detection zone is interrupted.
The F3S-A detects non-transparent objects of at least 15 mm in diameter (F3S-AJJ1) or of at least 25 mm in
diameter (F3S-AJJ2) as well as parts of an operators body, and can be used to form a safety system for stopping
a machine when any part of an operator’s body is detected.
The F3S-A has two outputs, both of which consist of a PNP transistor with Light-ON operating mode.

Emitter: Receiver:
F3S-AJJJ-L F3S-AJJJ-D

1-1 Features
EU Machinery Directive Compliance and UL Listed
The F3S-A complies with the EN standards; EN61496-1 and IEC61496-2 (Safe-
ty of Machinery: Electro-sensitive Protective Equipment), provided by the EU
Machinery Directive. (EN61496-2 has not been published yet.)
Also, the F3S-A complies with the international standard IEC61496-1 and -2,
and carries UL mark and C-UL (UL listed to Canadian safety standard) mark.
It achieves the highest possible level of safety by providing two channel outputs
and CPUs, as well as a number of self-diagnosis circuits. The F3S-A also has an
optical system with excellent directionality that minimizes the effects of interfer-
ence light such as room lighting and mutual interference.
Connection Function for Sensor Sets
The F3S-A has a connection function that prevents problems due to mutual in-
terference among multiple sets linked in series, parallel or mixed configurations.
The connection configuration can be selected according to the number of out-
puts required in the control system and the number of directions into dangerous
parts.
Mutual interference never occurs with multiple sets because the optical axes of
connected sensors are all controlled separately using a sync signal. Be sure to
see 1-5 Ratings and Performance for further details however because the num-
ber of sensors that can be connected as well as the total number of optical axes
are limited.

1-2 Basic Functions

Emitter
The emitter emits light together with an electrical signal for synchronization to
the receiver it faces. At this time, the light indicator lights indicating the emitter is
emitting.

1
Additional Functions Section 1-3

Receiver
The receiver turns ON control outputs when all optical axes are receiving light,
and turns OFF control output if any optical axis is interrupted. The ON-state indi-
cator will light when outputs are ON and the OFF-state indicator will light when
the outputs are OFF. The instability indicator will light when the light from any
optical axis is insufficient.

1-3 Additional Functions

External Diagnosis Function
This function determines whether the basic function of the receiver is operating
properly. Proper operation can be checked by having the external diagnosis in-
put of the emitter opened or connected to 9 to 24 V after turning the power ON.
Interference Light Search Function
This function checks for the presence or absence of interference light and can be
selected by turning ON power when the external diagnosis input of the emitter is
opened or connected to 9 to 24 V.

1-4 Safety Function

The F3S-A performs various diagnostic tests in order to ensure safety. When a
failure is discovered, the F3S-A immediately turns OFF control outputs and indi-
cates failure status on the indicators.
Lock-out Condition
The F3S-A stops machine operation with lock-out if it determines that a failure
discovered as a result of self diagnosis is unrecoverable. Normal operation will
not resume once the emitter or receiver enters lock-out status. In this case, ter-
minate operation immediately and replace with a new one.
OFF-hold Condition
The F3S-A stops machine operation with OFF hold if it determines that a failure
discovered as a result of self diagnosis is temporary and recoverable. Eliminate
the cause of the failure and turn F3S-A power back ON to resume normal opera-
tion.
Note The F3S-A does not have a muting function (function that disables detection).

2
Ratings and Performance Section 1-5

1-5 Ratings and Performance

Item Model F3S-A161 F3S-A321 F3S-A481 F3S-A082 F3S-A162 F3S-A242 F3S-A322 F3S-A482
No. of optical 16 32 48 8 16 24 32 48
axes
Protective height 150 mm 310 mm 470 mm 140 mm 300 mm 460 mm 620 mm 940 mm
Optical-axis pitch 10 mm 20 mm
Optical resolution Non-transparent: 15 mm in Non-transparent: 25 mm in diameter
diameter
Detection 0.2 to 5.0 m
distance
Response time ON → OFF: 20 ms max., OFF → ON: 55 ms max. (with stable light)
Supply voltage 24 VDC ±10% (ripple range (p-p): 10% max.)
Current 200 mA max.
consumption
Light source Infrared LED (860-nm wavelength)
Effective aperture Within ±2.5_ for the emitter and receiver at a detection distance of at least 3 m as provided by
angle IEC61496-2.
Operating mode*1 Light ON
Control output*1 Two PNP transistor outputs, 300 mA max. load current, and 2 V max. residual voltage (except for
voltage drop due to cord extension)
Mutual Split light emitting system using sync line connection (between emitters and between multiple
interference receivers)
interrupting No. of serial connections: Up to 3 sets
function
No. of parallel connections: Up to 4 sets
Total no. of optical axes: Up to 192 axes (with mixed serial and parallel connection)
External diagnosis After power ON
function*1 External diagnosis input line : Open or 9 to 24 V : Emitting OFF
External diagnosis input line : 0 to 1.5 V : Emitting ON (3 mA max. short-circuit current)
Interference light Prior to power ON
search function External diagnosis input line : Open or 9 to 24 V : Interference light search, 8 hrs max.
(continuous)
External diagnosis input line : 0 to 1.5 V : Emitting ON (3 mA max. short-circuit current)
Muting function Not available
Indicator Emitter Light indicator (orange LED) : Lit when emitting, flashing during external diagnosis and
interference light search.
Failure indicator (yellow LED) : Lit with emitter lock-out, flashing during emitter OFF-hold and
interference light search *2.
Receiver ON-state indicator (green LED) : Lit when receiving light.
OFF-state indicator (red LED) : Lit with interrupted light or failure, flashing during interference
light search.
Instability indicator (orange LED) : Lit with an insufficient light and interference light search.
Failure indicator (yellow LED) : Lit with receiver lock-out, flashing during receiver OFF hold
and interference light search *2.
Connection Connector-mounted cord pullout method
method
Protection circuit Output short protection
Ambient During operation : -10_ to 55_C (with no freezing)
temperature During storage : -30_ to 70_C
Ambient humidity During operation : 35 to 85% RH (with no condensation)
During storage : 35 to 95% RH

3
Ratings and Performance Section 1-5

Item Model F3S-A161 F3S-A321 F3S-A481 F3S-A082 F3S-A162 F3S-A242 F3S-A322 F3S-A482
Ambient light Incandescent lamps : 3,000 lx max. (receiver surface light intensity)
intensity Sunlight : 10,000 lx max. (receiver surface light intensity)
Insulation 20 MΩ min. (at 500 VDC)
resistance
Dielectric strength 1000 VAC 50/60 Hz for 1 min
voltage
Degree of IP64(IEC60529)
protection
Vibration Durability : 10 to 55 Hz, double-amplitude: 1.5 mm, X, Y and Z directions: For 2 hours
resistance Normal operation : 10 to 55 Hz, double-amplitude: 0.7 mm, X, Y and Z directions: For 50 min *3
Shock resistance Durability : 300 m/s2 [30 G], X, Y and Z directions: 3 times
Normal operation : 100 m/s2 [10 G], X, Y and Z directions: 1,000 times *3
Cord *4 Emitter and receiver: 8 cores (0.3 mm2 x 4 cores, 0.2 mm2 x 4 cores), external dimension: 6 mm in
diameter with spiral shield, allowable bend radius R36 mm
Materials Case : Aluminum
Front cover : PMMA (acrylic resin)
Cord : PVC
Accessories Test rod, mounting brackets (top and bottom), mounting brackets (intermediate) for the F3S-A322
and F3S-A482 only, Instruction Manual
Applicable IEC61496-1, EN61496-1 TYPE 4 ESPE
standard IEC61496-2 TYPE 4 AOPD

*1 The logic (ON/OFF) may differ from that normally used because a safety circuit is used. Be sure to check this
carefully.
*2 Lock-out: Output status OFF due to unrecoverable failure. OFF-hold: Output status OFF due to temporary fail-
ure.
*3 In accordance with IEC61496-1
*4 The optional extension cord provides the same performance.
(Reference)
Resistance: Power line and output line: 66.3 Ω/km
Sync line: 94.0 Ω/km
Use a cord of at least the same performance to extend the cord length. The total cord length must be 100 m or
less. Be sure to route F3S-A cords separated from high-potential power lines or through an exclusive conduit.

No. of optical axes

n
Receiver
Emitter

Protective
2 height
Optical-axis
pitch
1

Detection distance

4
 SECTION 2
Part Names and Description

2. Protective 4. Cap unit 7. Mounting brackets

height mark (top and bottom)

Φ15 mm
TEST ROD

1. Test rod marks

6. Case

8. Mounting bracket
(intermediate)

3. Optical axis 2. Protective height mark

7. Mounting brackets
(top and bottom)

5. Cord cap

Indicator area

<Emitter Indicators> <Receiver Indicators>

9. Optical-axis line mark
9. Optical-axis line mark 10. Light indicator 14. Fault indicator
(yellow) 12. ON-state
(orange) indicator (green)
LIGHT FAULT ON

FAULT UNSTAB OFF

11. Fault indicator (yellow) 15. Instability indicator (orange) 13. OFF-state indicator (red)

5
1. Test Rod Marks
The test rod is used in daily inspections to check whether the F3S-A has main-
tained the detection capability about the optical resolution. See 6-1 Daily Inspec-
tions for more details.
Test rod marks indicate the diameter of the test rod that must be used. The diam-
eter of the test rod is compared to the gap between the two white triangle marks
in order to determine whether the test rod is correct. This is particularly important
in applications where the F3S-A1 (10-mm optical-axis pitch) is connected with
F3S-Ajj2 (20-mm optical-axis pitch). Use the test rod marks to select the cor-
rect test rod.
2. Protective Height Mark
The protective height is indicated by white triangle marks.

Protective height marks

Test rod mark

TESTROD

φ 15 mm
Protective Test rod
height

Test rod mark and protective

height marks

3. Optical Axis
The light emitting elements of the emitter and the light receiving elements of the
receiver align at intervals of 10 mm (F3S-Ajj1) or 20 mm (F3S-Ajj2). The
elements, however, are not visible because the optical surface (light transmitting
surface) of the F3S-A is comprised of an infrared pass filter. The model can be
checked only via the nameplate.
4. Cap Unit , 5. Cord Cap
Remove these caps in order to attach the serial connection cord used to connect
F3S-As in series.
6. Case
Case is painted yellow to clearly define it as a safety sensor.
7. Mounting Brackets (Top and Bottom)
Mounting bracket combinations can be varied for side or rear mounting. Torsion
and tilt angles are both adjustable.
8. Mounting Brackets (Intermediate)
The intermediate mounting brackets are accessories for the F3S-A322 and
F3S-A482 only. Here again mounting bracket combinations can be varied for
side or rear mounting, and both torsion and tilt angles are adjustable. Note that
on the emitter and receiver machined hole positions for the mounting surface
are symmetrical on the left and right side (See 3-4 Mounting).
9. Optical-axis Line Mark
The center line for optical axes is indicated by white triangle marks. This position
is a reference line for measuring safety distance.

<Emitter Indicators>
10. Light Indicator (Orange)
The light indicator lights when the emitter is emitting light normally, and flashes
while the light is OFF during external diagnosis.

6
11. Fault Indicator (Yellow)
The fault indicator flashes to indicate the emitter is in OFF-hold condition.
The fault indicator remains lit to indicate the emitter is in lock-out condition.

<Receiver Indicators>
12. ON-state Indicator (Green)
The ON-state indicator remains lit if the F3S-A is operating normally and all opti-
cal axes are receiving light. It also indicates that both outputs are ON.
13. OFF-state Indicator (Red)
The OFF-state indicator remains lit if an object is detected in the detection zone
and at least one optical axis is interrupted. It indicates that both outputs are OFF
when the F3S-A is operating correctly.
14. Fault Indicator (Yellow)
The fault indicator flashes to indicate the receiver is in OFF-hold condition.
The fault indicator remains lit to indicate the receiver is in lock-out condition.
15. Instability Indicator (Orange)
The instability indicator remains lit with an insufficient light.

7
 SECTION 3
Wiring and Mounting

3-1 Installation Conditions

3-1-1 Detection Zone and Intrusion Path
WARNING

! WARNING
Do not use the F3S-A on machines that cannot be stopped by electrical control in
an emergency. For instance, the F3S-A may not be used on machines using full-
revolution clutches.
When using the F3S-A on PSDI (Presence Sensing Device Initiation) mode, the
appropriate control circuit shall be installed between the F3S-A and the machinery.
For further information on PSDI, please refer to OSHA1910.217, IEC61496-1, and
other relevant standards and regulations.
Install protective structures around the machine so that you must pass through the
detection zone to reach dangerous machine parts.
Install the F3S-A so that some part of the operator’s body remains in the detection
zone at all times when operating in dangerous machine parts.
Failure to do so may result in serious injury.
Be sure to use both output lines when constructing the safety system. The safety
system constructed using only one line may result in serious injury under a faulty
condition of the output circuit.

The F3S-A may be installed on a machine that can be stopped by electrical control in an
emergency. Make sure the machine structure does not hinder stop and other safety func-
tions.
The F3S-A detection zone is the entire range bound by the protective height of the emitter
and receiver. Be sure to install protective structures around the machine so that you must
pass through the detection zone to reach dangerous machine parts.
Also install the F3S-A so that operators working in dangerous machine parts are detected
at all times. Connect F3S-As in series as explained in 3-2 Configuration so that some part
of the operator’s body remains in the detection zone at all times whenever there is a wide
gap between the F3S-A and machine where operators may not be detectable.

9
Installation Conditions Section 3-1

Correct Installation
Dangerous machine parts can be Some part of the operator’s
reached only by passing through the body remains in the detection
sensor detection zone. zone while they are working.

Incorrect Installation
Dangerous machine parts can be A worker is between the sensor
reached without passing through detection zone and dangerous
the sensor detection zone. machine parts.

10
Installation Conditions Section 3-1

3-1-2 Safety Distance

! WARNING
Always maintain a safety distance between the F3S-A and dangerous machine
parts.
Serious injury may result if the machine does not stop before someone reaches a
dangerous machine part.

A safety distance is the minimum distance that must be maintained between the
F3S-A and a dangerous machine part in order to stop the machine before some-
one or something reaches it. Safety distance is calculated based on the follow-
ing equation when a person moves perpendicular to the detection zone of a light
curtain.
Safety distance (S)
= Intrusion speed into the detection zone (K)
×Total response time for the machine and light curtain (T)
+Additional distance calculated based on the optical resolution of
the light curtain (C) (1)
Intrusion speed (K), response time (T), and supplemental distance (C) vary with
national standards and individual machine standards. The equation will also be
different if the direction of intrusion is not perpendicular to the detection zone of
the light curtain. See related standards for more details.

Using prEn999 Standards Formula

When safety distance is not provided by European standards for individual ma-
chine, the distance can be calculated using prEN999 (Safety of machinery-The
positioning of protective equipment in respect of approach speeds of parts of the
human body).
Use the following flowchart to calculate safety distance for the F3S-A in accor-
dance with prEN999. Tm in the flowchart indicates machine response time. To
make this calculation simpler, some elements that can be calculated from the
light curtain response time and the optical resolution of the light curtain are cal-
culated beforehand.

Safety distance according to prEN999

800
F3S-A2
Safety distance 700
Safety distance S (mm)

F3S-A1
Optical-axis line 600
Dangerous 500
part
400
300
200
Intrusion 100
direction
0
0 0.1 0.2 0.3 0.4
Detection Machine response time Tm (s)
zone

11
Installation Conditions Section 3-1

(1) F3S-A1 (10-mm Optical-axis Pitch)

S < 100 mm 100 x S x 500 mm

S = 2000 mm/s × Tm + 48 mm

Use a safety Use the above

distance (S) of results for the safety
100 mm. S > 500 mm distance (S).

Recalculate S x 500 mm
S = 1600 mm/s × Tm + 40 mm

Use a safety
S > 500 mm
distance (S) of
500 mm.

Use the above

results for the
safety distance (S).

(2) F3S-A2 (20-mm optical axis pitch)

S x 500 mm
S = 2000 mm/s × Tm + 128 mm

Use the above

results for the safety
S > 500 mm distance (S).

Recalculate Sx500 mm

S = 1600 mm/s × Tm + 120 mm

Use a safety
S > 500 mm
distance (S) of
500 mm.

Use the above

results for the safety
distance (S).

Example of Flow Charts of the Safety Distance Calculation

(According to prEN999, Vertical Approach)

12
Installation Conditions Section 3-1

(Reference)

Method for calculating safety distance as provided by prEN999 (for intrusion

perpendicular to the detection zone)

Substitute K = 2,000 mm/s and C = 8 (d - 14 mm) in equation (1) and calculate as

shown below.

S=2000mm/sx(Tm+Ts)+8(d-14mm) (2)

Where..... S = safety distance (mm)

Tm = machine response time (s) (see note 1)

Ts = light curtain response time (s) (see note 2)

d = optical resolution of the light curtain (mm)

(2)Use S = 100 mm if the result of equation (2) is 100 mm or less, or recalculate
using the following equation with K = 1,600 mm/s if the result is over 500 mm.

S=1600mm/s × (Tm + Ts)+8(d - 14mm) (3)

(3)Use S = 500 mm if the result from equation (3) is 500 mm or less.

The F3S-A flowchart summarizes results of equations (2) and (3) substituting Ts
= 0.02 s and d = 15 mm for an F3S-A1, or d = 25 mm for an F3S-A2.

Note 1. The machine response time refers to the time from the moment when a ma-
chine receives a stop signal to the moment when the dangerous part of the
machine stops.

2. The light curtain response time refers to the time required for changing from
ON to OFF.

Using ANSI B11.19 Standards (U.S.A.) Formula

Safety Distance (S) = Intrusion speed (K)

× Response time (Ts + Tc + Tr + Tbm)
+ Additional distance (Dpf) (4)

Where...

K = Intrusion speed (OSHA recommended speed is 1600 mm/sec)

The intrusion speed K has not been determined by ANSI B11.19, although
various studies determined this value of 1600 mm/sec to over 2500 mm/
sec.
The employer should consider all factors, including the physical ability of
the operator, when determining the value of K to be used.

Ts = Stopping time of machine (sec)

Tr = F3S-A’s maximum response time (= 0.020 sec).

Tc = Maximum response time of machine control circuit to activate machine’s

brake.

Tbm = Additional time (sec)

When the machine has a brake monitor, calculation of Tbm shall be;
Tbm = Brake monitor set time – (Ts + Tc)
When the machine does not have a brake monitor, we recommend the
use of at least 20% of (Ts + Tc) as the additional time.

13
Installation Conditions Section 3-1

Dpf = Additional distance. According to ANSI standard, calculation of Dpf shall

be;
Or Dpf = 3.4 × (d – 7.0) (mm) : d is resolution of F3S-A
Safety distance according to ANSI B11.19
(When K = 1600 mm/sec)
800
F3S-A2
700

Safety distance S (mm)

F3S-A1
600
500
400
300
200
100
0
0 0.1 0.2 0.3 0.4
Response time of machine Ts + Tc + Tbm (s)

(Example of calculation of safety distance according to ANSI B11.19)

Assume that an object approaches vertically to the detection zone.
K = 1600 mm/sec, Ts + Tc = 0.06 sec, brake monitor set time = 0.1 sec:
Calculation (When using the F3S-A1)
From formula (4)
K = 1600 (mm/sec), Dpf = 3.4 × (15 – 7.0) = 27.2 mm
S = 1600 × (0.06 + 0.02 + 0.1 – 0.06) + 27.2
= 219.2 mm
Calculation (When using the F3S-A2)
From formula (4)
K = 1600 (mm/sec), Dpf = 3.4 × (25 – 7.0) = 61.2 mm
S = 1600 × (0.06 + 0.02 + 0.1 – 0.06) + 61.2
= 253.2 mm

14
Installation Conditions Section 3-1

3-1-3 Distance from Reflective Surfaces

! WARNING
Be sure to install the F3S-A to minimize the effects of reflections from reflective sur-
faces.
Failure to do so will cause detection to fail and may result in serious injury.
Install the F3S-A as least distance D shown below from reflective surfaces (highly
reflective surfaces) like metal walls, floors, ceilings and workpieces.

<Side View> <Top View>

Reflective ceiling

Emitter Receiver
Reflective surface
Detection zone 3°
Emitter 3°
Receiver

Reflective floor

"This indicates protective height marks (See Section 2.).

Distance between the emitter and Allowable installation distance D

receiver (detection distance L)
0.2 to 3 m 0.16 m
3 to 5 m L × tan3°= L × 0.052 (m)

Note. The effective aperture angle for the F3S-A is ±2.5j (when L > 3 m) as provided by
IEC61496-2, but install the F3S-A away from reflective surfaces at an effective
aperture angle of ±3j to consider misalignment during installation.

Allowable Distance from Sensor to Reflective Surface

Allowable installation distance D (m)

Install in this area.

Do not install in this area

Distance between emitter and receiver L (m)

15
Installation Conditions Section 3-1

3-1-4 Check List (1/3)

The last person in charge will check off boxes on the check list.
Mark the following items to check installation conditions.
1, 2, 3... 1.  Machine structure does not hinder stop and other safety functions.
2.  Intrusion into dangerous machine parts not possible without passing
through the F3S-A detection zone.
3.  Protective structure that allows the F3S-A to detect operators when
they are working in dangerous parts.
4.  Safety distance calculated.
Calculated distance: S = ( ) mm
5.  The actual distance is higher than the calculated distance.
Actual distance = ( ) mm
6.  Reflective surfaces are not installed in prohibited areas.

16
Configuration Section 3-2

3-2 Configuration
Multiple sets of the F3S-A can be connected. Connecting to sync lines prevents
mutual interference and ensures safety. Multiple sets can be connected in serial,
parallel or mixed (serial and parallel) configurations depending on the detection
zone and number of outputs.

! WARNING
Always use correct combinations of emitters and receivers.
A non-detection zone is created, for example, when an F3S-A161-L (10-mm pitch,
16-optical axis emitter) is combined with an F3S-A162-D (20-mm pitch, 16-optical
axis receiver).
Never connect multiple receivers to one emitter or multiple emitters to one receiver
in series or mixed connection.
Doing so may cause detection to fail due to mutual interference.
Never use the F3S-A in a retroreflective configuration. Doing so may cause detec-
tion to fail.

3-2-1 Connection
(1) 1 Set
Application
This is the most common configuration, and it is used with one dangerous ma-
chine part entered from one direction only.
Wiring
Connect a sync line to the emitter and receiver. Make sure the sync line 2 for the
emitter and receiver is open. See Section 3-5 for more details.
Output
1 set

(Correct)
Receiver
Emitter

Sync line 2 Sync line 2

Sync line 1

17
Configuration Section 3-2

(2) Series Connection (Up to 3 Sets)

Application
This configuration is used with one dangerous machine part that can be entered
from two or more directions.
Wiring
Wire as described in (1) above, then route serial connection cords (F39-JA1B
optional) between emitters and between receivers. See Section 3-5 for more de-
tails.
Output
1 set. Output turns OFF if either F3S-A is interrupted.

(Correct)

Receiver
Emmiter

Series Connection
Cords
(F39-JA1B)
Emmiter

Receiver

Receivers

Emitters
Sync line 2 Sync line 2

Sync line 1
(Incorrect) (Incorrect)

Emmiter
Receiver

Receiver
Emmiter

Emmiter
Emmiter

Receiver

Receiver

Sync line 1 Sync line 1

Do not connect the emitter and receiver in Do not face emitters and receivers from
series. different set types.
The F3S-A will be put in OFF-hold condition.
Otherwise the F3S-A will be put in OFF-hold
condition and detection will fail.

18
Configuration Section 3-2

(3) Parallel Connection (Up to 4 Sets)

Application
This configuration is used with two or more dangerous machine parts that can be
entered from one direction.
Wiring
Connect a sync line (emitter ! receiver ! emitter ! receiver) in that order. See
Section 3-5 for more details.
Output
The number of outputs equals the number of parallel connected sets. Only the
F3S-A output from which light is interrupted will turn OFF.

(Correct)
Emitter Receiver
Receiver Emitter

Receiver
Receiver

Emmiter
Emmiter

Sync line 2 Sync line 2

Sync line 1 Sync line 1

Sync line 2

(Incorrect) (Incorrect)

Receiver
Emmiter
Emmiter

Receiver

Receiver

Receiver

Emmiter

Emmiter

Do not connect receivers in parallel or the F3S-A will be put Do not connect emitters in parallel or the
in OFF-hold condition. F3S-A will be put in OFF-hold condition.

19
Configuration Section 3-2

(4) Mixed Connection (3 Sets in Series x 4 Sets in Parallel with Up to 192 Optical Axes)
Application
This configuration is used with two or more dangerous machine parts that can be
entered from two or more directions.
Wiring
Connect a sync line (emitter ! receiver ! emitter ! receiver) in that order for
sets connected in parallel.
For serially connected emitters and receivers use serial connection cord to con-
nect emitter to emitter and receiver to receiver. See Section 3.5 for more details.
Output
The number of outputs equals the number of parallel connected sets. If any seri-
ally-connected F3S-A detects interrupted light, the output from that F3S-A only
will turn OFF. This has no affect on other parallel-connected F3S-As.

(Correct)

Receiver
Receiver

Emmiter
Emmiter

Serially connection cords

(F39-JA1B)

Receiver
Emmiter

Emmiter
Receiver

Receiver
Emmiter

Sync line 2 Sync line 2

Sync line 1 Sync line 1 Sync line 1

Sync line 2

(Incorrect) (Incorrect)
Receiver

Receiver
Emmiter

Emmiter

Receiver
Receiver
Emmiter
Emmiter

Receiver

Do not connect two or more receivers to one emitter in parallel.

The F3S-A may be put in OFF-hold condition.

Do not connect two or more emitters to one receiver in parallel.

Mutual interference may put the F3S-A in OFF-hold condition.

20
Configuration Section 3-2

(5) No Connection
Take action to prevent mutual interference when two or more sensors are
installed without connection due to wiring limitations. After installation, use the
interference light search function described in Section 4.2 to make sure there is
no mutual interference that will put the F3S-A in OFF-hold condition.

(Correct)
ÉÉ
(Correct)

ÉÉ
ÉÉ
Receiver

Receiver
Emmiter

Emmiter
Receiver

Receiver
Emmiter

Emmiter
Sync line 2 Sync line 2 Sync line 2 Sync line 2 ÉÉ
ÉÉ
Sync line 2

Sync line 1 Sync line 1 Sync line 1 Sync line 1

Sync line 2
Install the emitters and receivers so that the
emitters’ backs are facing each other. Install a barrier.

(Incorrect)
Receiver

Receiver
Emmiter

Emmiter

Install the emitters and receivers so that the emitter’s back is

facing the receiver’s back. They are not connected by a sync
line and there is no barrier between them.

(Correct) (Correct)
Emmiter

Receiver

Sync line 2 Sync line 2 Emitter Receiver

Sync line 1
Receiver

Emmiter

Receiver Emitter

Sync line 2 Sync line 2

Top view
Sync line 1

Arrange them vertically with emit- Arrange them horizontally with

ters and receivers on opposite emitters and receivers on opposite
sides. (Possible to have them in sides. (Possible to have them in
contact with each other) contact with each other)

21
Configuration Section 3-2

(Correct) (Correct)
L
L

Emmiter

Receiver
Emitter Receiver

6°
Sync line 2 Sync line 2

Sync line 1 D
D Emitter Receiver
6°

Receiver
Emmiter

Top view

Sync line 2 Sync line 2

Sync line 1

Arrange the sets vertically so that the dis Arrange the sets horizontally so
tance between their protective height marks that the distance between their
is longer than D" in the following table. optical axes is longer than D"
in the following table.

Distance between emitter and Permissible installation distance (D)

receiver (detection distance L)
0.2 to 3 m 0.32 m
3 to 5 m L tan6°=L 0.105 (m)

22
Configuration Section 3-2

3-2-2 Order for Executing Emitting and Receiving Functions

When connecting F3S-As together, one of them must be designated as a master
sensor to prevent mutual interference.

1. The master sensor can be designated by connecting the master select input
terminal of the emitter to the 0V line.
2. No sensors other than the A1 shown below can be designated as the master
sensor.
3. The master sensor controls operation of the rest of the F3S-As. Mutual inter-
ference is prevented by operating all the F3S-As in sequence.
4. With the mixed connection, the serially connected group has priority in the
operation sequence in the order of *3A1 → A2 → A3 → B1 → B2...D2→ D3
as shown in the figure below (in the order of circled numbers 1 to 12).

A3 B3 C3 D3
Receiver

Receiver

Receiver

Receiver
Emmiter

Emmiter

Emmiter

Emmiter
*2 Series
extension
end

3 6 9 12

A2 B2 C2 D2
Receiver

Receiver

Receiver

Receiver
Emmiter

Emmiter

Emmiter

Emmiter
2 5 8 11

A1 B1 C1 D1
Receiver

Receiver

Receiver

Receiver
Emmiter

Emmiter

Emmiter

Emmiter

Master end
1 4 7 10

Master sensor

*1 Master end Slave end

*1 Master End/Slave End

When F3S-As are connected in parallel, the master sensor end is called the
master end and the other end is called the slave.
*2 Master End/Series Extension End
In a series configuration, the master sensor end is called the master end and the
other end is called the serial extension end.
*3 A1, A2, to D4
These are sensor IDs when F3S-As are connected together. A1 is the master
sensor.
Series connection is comprised of A1 and A2 (2 sets connected in series) or A1,
A2 and A3 (3 sets connected in series).
Parallel connection is comprised of A1 and B1 (2 sets connected in parallel) A1,
B1 and C1 (3 sets connected in parallel) or A1, B1, C1, and D1 (4 sets connected
in parallel).

23
Dimensional Drawings Section 3-3

3-3 Dimensional Drawings

3-3-1 Side Mounting
Emitter

F3S-A-L
2-M6
PAN-HEAD SCREWS

M6
UPSET HEXAGON BOLT

2-MOUNTING HOLES

(PROTECTIVE HEIGHT)
(NOTE2)
INTERMEDIATE BRACKET
M4

(OPTICAL AXIS PITCH)

UPSET HEXAGON BOLT

VINYL INSULATED ROUND CORD

Φ6 (12/Φ0.18) 4 CORES
(7/Φ0.2) 4 CORES
STANDARD LENGTH 0.4 m
WITH YELLOW LINE
OPTICAL AXIS LIGHT INDICATOR

FERRITE CORE 2-M6 FAULT INDICATOR

SQUARE NUTS

Max

2-MOUNTING BRACKETS
4-MOUNTING HOLES 4-M5
SNW-1608-PCM-6W
WATERPROOF UPSET HEXAGON BOLTS
CONNECTOR

NOTE1 SIZES AND NUMBER OF OPTICAL AXES ARE

AS BELOW
UNIT : mm
NUMBER OF
TYPE OPTICAL
AXES

(NOTE2)
2-M5
15
B

(NOTE2)
F

4-M5 NOTE 2 THIS INTERMEDIATE BRACKET AND MOUNTING SCREW

HOLES FOR IT ARE APPLIED TO TYPE F3S-A322-L AND F3S-
A482-L
A Full length when mounting bracket
20 B Bracket mounting hole center width
(NOTE2) 24 C Full length of main sensor
D Sensor mounting hole center width
E Protective height
F Mounting bracket (intermediate) mounting position
MOUNTING SCREW HOLES P: Optical axis pitch

24
Dimensional Drawings Section 3-3

Receiver

F3S-A-D

2-M6
PAN-HEAD SCREWS

M6
UPSET HEXAGON BOLT

M4
UPSET HEXAGON BOLT

(NOTE2)
INTERMEDIATE BRACKET
(OPTICAL AXIS PITCH)

2-MOUNTING HOLES
(PROTECTIVE HEIGHT)

2-M6
SQUARE NUTS VINYL INSULATED ROUND CORD
FAULT INDICATOR OPTICAL AXIS Φ6 (12/Φ0.18) 4 CORES
ON-STATE INDICATOR (7/Φ0.2) 4 CORES
INSTABILITY INDICATOR FERRITE CORE STANDARD LENGTH 0.4 m
OFF-STATE INDICATOR

SNW-1608-PCM-6
Max WATERPROOF CONNECTOR

2-MOUNTING BRACKETS

4-MOUNTING HOLES

4-M5
UPSET HEXAGON BOLTS

NOTE1 SIZES AND NUMBER OF OPTICAL AXES ARE

AS BELOW
UNIT : mm
NUMBER OF
TYPE OPTICAL
AXES
(NOTE2)
2-M5
15

B
F
(NOTE2)

4-M5 NOTE 2 THIS INTERMEDIATE BRACKET AND MOUNTING SCREW

HOLES FOR IT ARE APPLIED TO TYPE F3S-A322-L AND F3S-
A482-L
A Full length when mounting bracket
20 B Bracket mounting hole center width
24 (NOTE2) C Full length of main sensor
D Sensor mounting hole center width
E Protective height
F Mounting bracket (intermediate) mounting position
MOUNTING SCREW HOLES P: Optical axis pitch

25
Dimensional Drawings Section 3-3

3-3-2 Rear Mounting

Emitter

F3S-A-L
2-M6
PAN-HEAD SCREWS

M6
2-MOUNTING HOLES UPSET HEXAGON BOLT

(NOTE2)
INTERMEDIATE BRACKET

(PROTECTIVE HEIGHT)
(OPTICAL AXIS PITCH)
M4
UPSET HEXAGON BOLT

VINYL INSULATED ROUND CORD

Φ6 (12/Φ0.18) 4 CORES OPTICAL AXIS
STANDARD LENGTH 0.4 m
WITH YELLOW LINE LIGHT INDICATOR

FAULT INDICATOR
FERRITE CORE

Max 2-M6
SQUARE NUTS

2-MOUNTING BRACKETS

4-M5 4-MOUNTING HOLES

UPSET HEXAGON BOLTS
SNW-1608-PCM-6
WATERPROOF CONNECTOR

NOTE1 SIZES AND NUMBER OF OPTICAL AXES ARE

AS BELOW
UNIT : mm
NUMBER OF
(NOTE2) OPTICAL
TYPE
2-M5 AXES
15
B

(NOTE2)
F

4-M5
NOTE 2 THIS INTERMEDIATE BRACKET AND MOUNTING SCREW
HOLES FOR IT ARE APPLIED TO TYPE F3S-A322-L AND F3S-
A482-L
20 A Full length when mounting bracket
(NOTE2) 24 B Bracket mounting hole center width
C Full length of main sensor
D Sensor mounting hole center width
E Protective height
MOUNTING SCREW HOLES F Mounting bracket (intermediate) mounting position
P: Optical axis pitch

26
Dimensional Drawings Section 3-3

Receiver

F3S-A-D
2-M6
PAN-HEAD SCREWS

M6
UPSET HEXAGON BOLT

M4
UPSET HEXAGON BOLT

(NOTE2)
INTERMEDIATE BRACKET
(PROTECTIVE HEIGHT)
(OPTICAL AXIS PITCH)

2-MOUNTING HOLES

VINYL INSULATED ROUND CORD

OPTICAL AXIS Φ6 (12/Φ0.18) 4 CORES
FAULT INDICATOR (7/Φ0.2) 4 CORES
INSTABILITY INDICATOR ON-STATE INDICATOR FERRITE CORE STANDARD LENGTH 0.4 m

OFF-STATE INDICATOR

2-M6
SQUARE NUTS
SNW-1608-PCM-6
Max WATERPROOF CONNECTOR

2-MOUNTING BRACKETS

4-MOUNTING HOLES
4-M5
UPSET HEXAGON BOLTS

NOTE1 SIZES AND NUMBER OF OPTICAL AXES ARE

AS BELOW UNIT : mm
NUMBER OF
TYPE OPTICAL
AXES

(NOTE2)
2-M5
15

NOTE 2 THIS INTERMEDIATE BRACKET AND MOUNTING SCREW

HOLES FOR IT ARE APPLIED TO TYPE F3S-A322-L AND F3S-
A482-L
F
(NOTE2)

4-M5 A Full length when mounting bracket

B Bracket mounting hole center width
C Full length of main sensor
D Sensor mounting hole center width
20 E Protective height
24 (NOTE2) F Mounting bracket (intermediate) mounting position
P: Optical axis pitch

MOUNTING SCREW HOLES

27
Mounting Section 3-4

3-4 Mounting
3-4-1 Mounting Procedure
• Mount the F3S-A to ensure a bend radius of at least R36 (mm) on the F3S-A
cord so as to minimize the possibility of functional failure due to age deteriora-
tion. Be careful not to allow the bend radius of the cord to become smaller than
R36 even if the cord comes in contact with the mounting surface.
• The emitter and receiver must be mounted level. Design a mounting configura-
tion based on the effective aperture angle of the F3S-A (about ±1.5j with a
detection distance of 5 m) and the adjustment range for the mounting brackets
(See section 3-4-3 for more details.).
[Procedure] With the F3S-A161, 321, 481, 082, 162, 242
1. Mounting Bracket (Top and Bottom) Assembly Marking for adjusting degree

Choose the mounting direction for the L-and U-shaped bracket

combination based on the mounting direction (side or rear) and
temporarily secure the brackets with two M5 x 8 screws. Be
sure to align the markings for adjusting degree (scribed lines)
on the L-and U-shaped brackets at this time. L-shaped
bracket

U-shaped
bracket

Side mounting Rear mounting

2. Mounting Bracket (Top and Bottom) Installation

Clasp the cap with the U-shaped bracket and insert the M6 x 45
screw through the mounting holes of the U-shaped bracket and
the F3S-A. Press the U-shaped bracket flush against the rear of
U-shaped bracket
the F3S-A and secure it temporarily with square nuts.

Cap

3. Sensor Mounting
Secure the L-shaped bracket to the mounting surface making
sure that the emitter and receiver are mounted at the same
height.

28
Mounting Section 3-4

F3S-A322 and 482

1. Mounting Bracket (Intermediate) Assembly L-shaped intermediate bracket
Choose the mounting direction for the L- and U-shaped inter- U-shaped intermediate bracket
mediate bracket combination based on the mounting direction
(side or rear) and temporarily secure the brackets with the M4 x
10 screw.

Side mounting Rear mounting

2. Mounting Bracket (Intermediate) Installation

Case
Clasp the center of the case with the U-shaped bracket and
temporarily secure the bracket to the F3S-A with the M6 x 8
screw. The mounting bracket (intermediate) for the emitter is
oriented upside down when compared to the bracket of the re-
ceiver. Refer to Section 3-3 for details.
U-shaped intermediate bracket

3. Mounting Bracket (Top and Bottom) Assembly Marking for adjusting degree

Choose the mounting direction for the L- and U-shaped bracket

combination based on the mounting direction (side or rear) and
temporarily secure the brackets with two M5 x 8 screws. Be
sure to align the markings for adjusting degree (scribed lines)
on the L- and U-shaped brackets at this time. L-shaped
bracket

U-shaped
bracket

Side mounting Rear mounting

4. Mounting Bracket (Top and Bottom) Installation

Clasp the cap with the U-shaped bracket and insert the M6 x 45
screw through the mounting holes of the U-shaped bracket and
the F3S-A. Press the U-shaped bracket flush against the rear of
U-shaped bracket
the F3S-A and secure it temporarily with square nuts.

Cap

5. Sensor Mounting
Secure the L-shaped bracket to the mounting surface making
sure that the emitter and receiver are mounted at the same
height. Then secure the L-shaped intermediate bracket to the
mounting surface.

29
Mounting Section 3-4

3-4-2 Dimensional Drawing of the Mounting Bracket Assembly (Rear

Mounting)
Mounting Brackets (Top and Bottom)

U-SHAPED BRACKET
90-DEGREE ROTATION IN EITHER DIRECTION IS POSSIBLE
MARKING FOR ADJUSTING DEGREE FIXING SCREW FOR BRACKET (M5x8)
ADJUSTING DEGREE:±10°

INTERMEDIATE SHAFT Φ8

L-SHAPED BRACKET

Configuration of U-shaped Intermediate Bracket Mounted at 90 Degree Angle

30
Mounting Section 3-4

Mounting Brackets (Intermediate): Use with the F3S-A322 and F3S-A482.

MOUNTING SCREW FOR SENSOR (M6x8)

FLAT INTERMEDIATE BRACKET

RUBBER

U-SHAPED INTERMEDIATE BRACKET

FIXING SCREW FOR BRACKET (M4x10)

L-SHAPED INTERMEDIATE BRACKET

Configuration of U-shaped Intermediate Bracket Mounted at 90 Degree Angle

31
Mounting Section 3-4

3-4-3 Mounting Angle Adjustment Range

Side Mounting
Mounting surface

Torsion angle adjustment Tilt angle adjustment range (+direction)

range (+direction)

Torsion angle adjustment Tilt angle adjustment range (-direction)

range (-direction)

Rear Mounting
Optical axis
Mounting surface

Torsion angle Tilt angle adjustment range (+direction)

adjustment range (+direction)

Torsion angle Tilt angle adjustment range (-direction)

adjustment range (-direction)

Tilt Angle Adjustment Range (θ)

Model θ
F3S-A161 2.9°
F3S-A321 1.6°
F3S-A481 1.1°
F3S-A082 2.9°
F3S-A162 1.6°
F3S-A242 1.1°
F3S-A322 0.8°
F3S-A482 0.6°

32
Wiring Section 3-5

3-5 Wiring
WARNING

! WARNING
Do not short output lines to the +24V line.
Connect a load between the output and 0 V line. If a load is mistakenly connected
between the output and +24 V line, the operating mode will switch to the mode in
which output is turned ON when light is interrupted, creating a dangerous situation.
Be sure to use both output lines when constructing the safety system. The safety
system constructed using only one line may result in serious injury under a faulty
condition of the output circuit.

Correct Incorrect

Brown Brown
+24 V +24 V
Black, White
F3S-A F3S-A Load
Receiver Receiver
Load Black, White
Blue Blue
0V 0V

3-5-1 Power Supply Units and Loads

DC power supply units must satisfy all the conditions below.
• The power supply is connected to the F3S-A only and not to other devices or
machines.
• The power supply conforms to EMC Directive (industrial environment).
• The power supply conforms to Low-voltage Directive.
• The power supply conforms to UL508 (output current is less than 8A) or
UL1310.
• The power supply uses double or reinforced insulation between the primary
and secondary circuits.
• The power supply automatically resets overcurrent protection characteristics
(voltage drop).
• The power supply maintains an output holding time of at least 20 ms.
• FG (frame ground terminal) should be connected to PE when using a commer-
cially available switching regulator.
• Recommended power supplies: S82K, S82J, S82F or S82F-P made by
OMRON.

33
Wiring Section 3-5

Use double insulation as shown in the figure below to protect the load from haz-
ardous voltage levels when the load is a relay. The basic insulation shown in the
following illustration should insulate against hazardous voltage levels (230 VAC,
etc.), not simply against 24 VDC.

Double insulation
Note. This part of the insulation
Basic insulation (See note.) Basic insulation provides supplementary
Output (black and white) insulation against hazard-
ous voltage level.
F3S-A 0 V (Blue)
+24 V (Brown)
K1 K1 K2 K2 Motor, etc.
Power
Supply
Power Supply Unit 2
Unit 1
Hazardous voltage level

Reinforced Basic insulation

insulation
or double
insulation
Hazardous Hazardous
voltage level voltage level

34
Wiring Section 3-5

3-5-2 Wiring Diagram

See Section 3-2 for more details on sensor IDs (A1, A2, B1)

J1 Set JParallel Connection

Emitter Receiver Emitter 1 Receiver 1 Emitter 2 Receiver 2

A1 B1
Receiver Extension Receiver Extension
Cord (F39-JAA-D) Master Cord (F39-JAA-D) Receiver Extension
Cord (F39-JAA-D)
Emitter Extension Emitter Extension
Emitter Extension
Cord (F39-JAA-L) Cord (F39-JAA-L)
Cord (F39-JAA-L)

Shield Shield Shield

Shield Shield
Shield

Red Red Gray Red

Gray/Black
Gray
Gray/Black
Gray/Black

Brown

Brown

Gray
Blue

Blue
Pink
Gray

Violet

Brown

White
Violet
Red/black Red/black Gray/black Red/black

Black
Gray
Gray/Black

Brown

Brown

White
Blue

Blue
Pink

Black
Violet

Brown

White
Blue

Blue
Pink
Black

Open
Open
Open

Open

Open
Open
Open
Open
Open

Load
Load

Load
Load

Load
Load
*2 *2
*1 24 VDC *1 24 VDC

JSeries Connection JMixed Connection

Emitter 2 Receiver 2 Emitter 2 Receiver 2

Series Connection Cord

(F39-JA1B Series Connection Cord
A2 Emitter-Receiver Set) A2 (F39-JA1B
Emitter-Receiver Set) Emitter 3 Receiver 3
Emitter 1 Receiver 1 Emitter 1 Receiver 1

A1 Receiver Extension A1 Receiver Extension B1

Master Cord (F39-JAA-D) Master Cord (F39-JAA-D) Receiver Extension
Emitter Extension Cord (F39-JAA-D)
Emitter Extension Emitter Extension
Cord (F39-JAA-L)
Cord (F39-JAA-L) Cord (F39-JAA-L)

Shield Shield
Shield Shield Shield Shield

Red Red Gray Red

Gray
Gray/Black

Gray/Black

Brown
Gray

Gray/Black
Brown

Brown

Blue

Gray/Black
Gray
Blue

Blue

Violet
Pink
Gray

Violet

Brown
Pink

White
Violet

Brown

White
Brown

Black
White

Gray/black Red/black
Black

Red/black Red/black
Pink
Black

Blue

Blue
Blue

Open
Open
Open
Open

Open
Open
Open

Open
Open
Load
Load
Load
Load
Load
Load

*2 *2
*1 24 VDC *1 24 VDC

*1 External diagnosis switch that is shorted for normal operation and is open for external diagnosis.
*2 Use the same power supply unit.

35
Wiring Section 3-5

3-5-3 Wiring Procedure

1. Connect the emitter extension cord (F39-JAA-L optional) to the emitter.
The cord with the yellow line on the outer jacket is the emitter extension
cord.
2. Connect the receiver extension cord (F39-JAA-D optional) to the receiver.
3. Connect the shielded wire of the cord to the 0V line of the power supply.
Connect the 0V line of the power supply directly to protective earth (PE) or
mount a capacitor (metallized polyester capacitor, etc.) with a minimum
47-nF capacity and minimum 630 V voltage rating between the 0V line and
PE.
Note. Be sure to wire correctly. Failure to do so may damage the F3S-A.
Be sure to use shielded twisted pair cable (cross-section at least 0.2 mm2 in di-
ameter) when extending the sync line (red, red/black, gray, gray/black) without
using an extension cord. Be sure to connect the shield to the 0V line of the power
supply.

Connector (Main Unit End)

Unit: mm 22 dia.

Pin No. Receiver Emitter

1 0V 0V
2 +24 V +24 V
3 Sync line 2 (+) Sync line 2 (+)
4 Sync line 1 (+) Sync line 1 (+)
5 Sync line 1 (–) Sync line 1 (–)
6 Sync line 2 (–) Sync line 2 (–)
7 Control output 2 Master selection input
8 Control output 1 External diagnosis input

36
Wiring Section 3-5

Emitter Extension Cord (F39-JAA-L Optional)

+100
59.5 L 0
(note)

Yellow line

Round vinyl-insulated cord, 6 mm

dia. (12/0.8 mm dia) 4 cores
Connector (7/0.2 mm dia) 4 cores

Unit: mm

Pin No. Wire Color (Label Marking) Signal Name (Label Marking)
1 Blue (Blue) 0V (0
( V))
Shield (Shield)
2 Brown (Brown) +24 V (24 VDC)
3 Gray (Gray) Sync line 2 (+) (SYNC.2 (+))
4 Red (Red) Sync line 1 (+) (SYNC.1 (+))
5 Red/Black* (Red/Black) Sync line 1 (–) (SYNC.1 (–))
6 Gray/Black* (Gray/Black) Sync line 2 (–) (SYNC.2 (–))
7 Violet (Violet) Master selection input (MASTER)
8 Pink (Pink) External diagnosis input (EXT.)

*The red/black wire and the gray/black wire are red and gray wires, respectively,
with a black line.
Note. Dimensions differ according to the model as shown in the following table.

Unit: mm
Model L
F39-JA1A-L 3000
F39-JA2A-L 7000
F39-JA3A-L 10000

37
Wiring Section 3-5

Receiver Extension Cord (F39-JAA-D Optional)

+100
59.5 L 0
(note)

Round vinyl-insulated cord, 6 mm

dia. (12/0.18 mm dia) 4 cores
Connector (7/0.2 mm dia) 4 cores

Unit: mm

Pin No. Wire Color (Label Marking) Signal Name (Label Marking)
1 Blue (Blue) 0V (0
( V))
Shield (Shield)
2 Brown (Brown) +24 V (24 VDC)
3 Gray (Gray) Sync line 2 (+) (SYNC.2(+))
4 Red (Red) Sync line 1 (+) (SYNC.1(+))
5 Red/Black* (Red/Black) Sync line 1 (–) (SYNC.1(–))
6 Gray/Black* (Gray/Black) Sync line 2 (–) (SYNC.2(–))
7 White (White) Control output 2 (OUTPUT2)
8 Black (Black) Control output 1 (OUTPUT1)

*The red/black wire and the gray/black wire are red and gray wires, respectively,
with a black line.
Note. The dimensions differ according to the model as shown in the following table.

Units: mm
Model L
F39-JA1A-D 3000
F39-JA2A-D 7000
F39-JA3A-D 10000

38
Wiring Section 3-5

3-5-4 Series Connection Procedure

Note. The series connection cord is the same for both the emitter and the receiver.
[Procedure]

1. Remove the cap from the master-end F3S-A (e.g., master sensor) as well as
the cord cap on the series extension-end F3S-A. Save the four M3 x L20
screws used to secure the caps and reuse them to secure the series con-
nection cord.

Master-end F3S-A Cap Cord cap Series extension-end F3S-A

2. Make sure the connectors are properly connected and secure the series
connection cord to both F3S-As with screws. Use a torque force of 0.54 N
m
(5.5 kg
cm) to tighten the screws.
Reverse the above procedure to remove the series connection cord and replace
the cap or cord cap. Use a torque force of 0.54 N
m (5.5 kg
cm) to secure the
caps.

Connector: Receptacle Connector: Receptacle

Connector: Pin header
Connector: Pin header

Series Connection Cord

(F39-JA1B)

Series Connection Cord (F39-JA1B Optional)

39
Wiring Section 3-5

3-5-5 Check List (2/3)

The last person in charge will check the items shown in the following check list.
Check the following items to make sure wiring is correct before turning ON power.
1.  The power supply unit is only connected to the F3S-A.
2.  The power supply unit is a 24-VDC unit that conforms to the EMC Di-
rective, Low-voltage Directive and output holding specifications.
3.  The polarity of the power supply connection is not reversed.
4.  The emitter extension cord is properly connected to the emitter and the
receiver extension cord is properly connected to the receiver.
5.  Double insulation is used between the output and the hazard potential
(commercial power supplies, etc.).
6.  Outputs are not shorted to the +24V line.
7.  Loads are not connected to the +24V line.
8.  Sync lines are not connected to the +24V line or 0V line.
9.  No lines are connected to a commercial power supply.
10.  When two or more F3S-As are used, they are connected properly or
countermeasures are taken to prevent mutual interference.
11.  With parallel connection, the master select input terminal of the master
emitter is connected to the 0V line and the master select input terminal
of the slave emitter is open.
12.  With parallel connection, the external diagnosis input terminals of all
emitters are connected together.
Turn ON power and make sure the F3S-A is operating properly as described below.
See Section 4. Operation for more details on operation and functions. If the
F3S-A is not operating properly, take action as described in Section 7. Trouble-
shooting.
1.  The F3S-A will begin operating normally within 5 seconds after power
is turned ON if the external diagnosis input terminal is connected to the
0V line.
2.  The external diagnosis function will activate if the external diagnosis
input terminal is opened after power is turned ON.

40
Adjustment Section 3-6

3-6 Adjustment
3-6-1 Adjustment Procedure
When using a series connection, adjust the optical axes from the series ex-
tension end in sensor ID order (A3 → A2 → A1). Any attempt to adjust the
optical axes in order starting from the master end will not be accepted be-
cause the OFF-state indicator (red) will remain lit if the series extension end
is not receiving light.
[Procedure]

1. Check the following points.

The optical surfaces of the emitter and receiver should not be
dirty.
There should be no light-interrupting objects in the F3S-A detec-
tion zone.
2. Adjust the torsion angle of the emitter while monitoring the indicator for the
receiver and locate the point where the ON-state indicator (ON: green) is lit
and the instability indicator (UNSTAB: orange) goes OFF.
If the instability indicator does not go OFF, temporarily set the tor-
sion angle at the most stable state and adjust the tilt angle.
If the ON-state indicator is OFF, adjust the tilt angle.
3. Adjust the torsion angle and tilt angle so that light-receiving condition be-
comes as stable as possible. The level of stability becomes higher as the
offset angle that ensures stable light-receiving condition becomes larger.
When the above adjustments have been completed, tighten all brackets and
mounting screws while being careful not to change the optical axis adjust-
ment for the F3S-A. The tightening torque for these screws is shown in the
following table.
Mounting Screw Tightening torque
bracket types designation
and length
(mm)
Mounting M5 8 2.3 N
m (23.5 kg
cm)
brackets (top and
bottom) M6 45 4.3 N
m (43.9 kg
cm)
Mounting M4 10 1.2 N
m (12.2 kg
cm)
brackets
(intermediate) M6 8 4.3 N
m (43.9 kg
cm)

4. If stable light receiving condition is not obtained through the angle adjust-
ment of the emitter, perform the following adjustments.
If the instability indicator does not go OFF, temporarily fix the emit-
ter at the most stable state and conduct angle adjustment for the
receiver according to the procedure described in the above step
2.
If the ON-state indicator is not lit, reset the emitter to its initial tem-
porary mounting state (refer to Section 3-4) and conduct angle ad-
justment for the receiver according to the procedure described in
the above step 2.
5. If stable light receiving condition is not obtained through the above angle ad-
justment of the receiver, check for parallelism between the emitter mounting
surface and the receiver mounting surface and also check if the emitter and
receiver are mounted to the same height.

41
Adjustment Section 3-6

3-6-2 Check List (3/3)

The last person in charge will check the items in the following check list.
After mounting the F3S-A, make sure it is operating properly as shown below.
Also make sure that interference light is not received by the F3S-A.
See Section 4. Operation for more details on operation and functions.
If the F3S-A is not operating properly take action as described in Section 7. Trou-
bleshooting.
1.  Make sure the test rod is not deformed.
Make sure the F3S-A is operating as shown below with the ma-
chine stopped.
2.  Make sure there is nothing in the detection zone. The light indicator
(orange) for the emitter and the ON-state indicator (green) for the re-
ceiver will light within 5 seconds after F3S-A power is turned ON.
3.  A test rod with the same diameter as that printed on an optical surface
can be detected at any position in the detection zone. In other words,
the OFF-state indicator (red) on the receiver will remain lit when the
test rod enters the detection zone.
Detection check points are:
(A) Protective height directly in front of the emitter
(B) Protective height directly in front of the receiver
(C) Protective height midway between the emitter and receiver
*When using an F3S-A1 and F3S-A2 together, use the correct test rod
for each type of sensor because the diameters of the test rods are different.
F3S-A1: 15-mm diameter test rod ID No. 2988969-9
F3S-A2: 25-mm diameter test rod ID No. 2988970-2
(A)

(C)

(B) Test rod

Emitter

Receiver

4.  If the external diagnosis input terminal is opened after F3S-A power is

turned ON, output turns OFF because light emission is stopped. If the
external diagnosis input terminal is shorted to the 0V line, output turns
ON because light is emitted.
5.  The interference light search function activates if the F3S-A power is
turned ON with the external diagnosis input terminal left open. (The
OFF-state indicator (red) and the fault indicator (yellow) for the receiver
flash simultaneously.)
The receiver indicators indicate that there is no interference light. (The
instability indicator (orange) for the receiver is not lit. If it was lit, this
would indicate the presence of interference light.)
Operate the machine and check to see if the dangerous part
stops under the conditions below.

42
Adjustment Section 3-6

6.  The dangerous part moves when there is nothing in the detection zone.
7.  The dangerous part stops immediately when the test rod is inserted
into the detection zone directly in front of the emitter, directly in front of
the receiver and midway between the emitter and receiver. (Be sure to
use the correct test rod as explained in 3.)
8.  The dangerous part remains stopped as long as the test rod is present
in the detection zone.
9.  The dangerous part stops when the F3S-A power supply is turned OFF.
10.  The overall machine response time actually measured is less than the
calculated response time.

43
 SECTION 4
Operation

Symbols
Indicator Status Indicator Layout and Colors

Emitter Receiver
Not lit Orange Yellow Green
Lit (continuously lit) LIGHT FAULT ON
Flashing (flashing in about 0.5-s intervals)
FAULT UNSTAB OFF
Flicker (irregularly lit and not lit) Red
Yellow Orange

4-1 Normal Operation

Status Indication Output 1 Output 2
Stable light reception
Adequate light for all LIGHT FAULT ON
optical axes ON ON
FAULT UNSTAB OFF

Interrupted light
An interrupted optical LIGHT FAULT ON
axis OFF OFF
FAULT UNSTAB OFF

Unstable light reception

Insufficient light for at LIGHT FAULT ON
least one optical axis ON ON
The instability indicator FAULT UNSTAB OFF
(UNSTAB) will flicker if
the amount of light
received approaches LIGHT FAULT ON
stable light received ON ON
status.
FAULT UNSTAB OFF

Timing Chart
ON
Power supply
OFF 5 s max.

ON
Light emission
OFF

Light
Light receiving reception
status Interrupted

55 ms 20 ms
(Stable light
reception)
Output ON
(See Note) (See
(both 1 and 2)
OFF Note)

Note Includes maximum OFF time of 210 µs for self diagnosis. See Output Waveform
with Output ON in 4-4 I/O Circuits.

45
Normal Operation Section 4-1

Series Connection
• Both outputs will turn OFF if any set enters interrupted status.
• The OFF-state indicator for the interrupted receiver as well as subsequent re-
ceivers connected on the master end will light. If A2 is interrupted for example,
then the OFF-status indicators of A1 and A2 will light.

A3
LIGHT FAULT ON

Receiver
Emitter

FAULT UNSTAB OFF

A2 LIGHT FAULT ON
Receiver
Emitter

FAULT UNSTAB OFF

LIGHT FAULT ON
A1
FAULT UNSTAB OFF
Receiver
Emitter

Master

46
Selecting Additional Functions Section 4-2

4-2 Selecting Additional Functions

The F3S-A is also equipped with the functions below. Check to see if the F3S-A
operates properly and interference light is not received by carrying out these
function.

External Diagnosis Function

This function determines whether the basic function of the receiver is operating
properly. The receiver is operating correctly if both receiver outputs are OFF
when the external diagnosis input terminal is opened after power is turned ON.
The external diagnosis cannot be performed if the light is interrupted.

Procedure Indication Output 1 Output 2

1.Check to see if the
external diagnosis LIGHT FAULT ON
input terminal is
OFF OFF
connected to the 0V FAULT UNSTAB OFF
line before turning
F3S-A power ON.
2.Check to see if F3S-A
output turns ON when LIGHT FAULT ON
power is turned ON. ON ON
FAULT UNSTAB OFF

3.External diagnosis will

begin (light emission LIGHT FAULT ON
stops) when the
OFF OFF
external diagnosis FAULT UNSTAB OFF
input terminal is
opened.
4.Connect the external (After returning to normal operation)
diagnosis input
terminal to the 0V line
LIGHT FAULT ON
to terminate the
ON ON
external diagnosis
function. This may be FAULT UNSTAB OFF
done with F3S-A
power ON or OFF.

Timing Chart

ON
Power supply
OFF

H
External (open)
diagnosis input L
Normal External Normal operation
ON operation diagnosis
Light emission
OFF

Output ON
(both 1 and 2) OFF

47
Selecting Additional Functions Section 4-2

Interference Light Search Function

This function checks for the presence or absence of harmful interference light.
The receiver searches for interference light when F3S-A power is turned ON
with the external diagnosis input terminal open. It takes about 5 seconds to de-
tect interference light, and the indicator will continue indicating the presence of
interference light for 5 seconds even after the light is eliminated.

Procedure Indication Output 1 Output 2

1.Check to see if the
external diagnosis LIGHT FAULT ON
input terminal is open OFF OFF
before turning ON the
FAULT UNSTAB OFF
power supply.

2.Execute the No interference light detected

interference light
search function by LIGHT FAULT ON
turning power ON.
FAULT UNSTAB OFF

OFF OFF
Interference light detected

LIGHT FAULT ON

FAULT UNSTAB OFF

3.Connect the external (After returning to normal operation)

diagnosis input
terminal to the 0V line
LIGHT FAULT ON
to terminate the ON ON
external diagnosis
function and then turn FAULT UNSTAB OFF
the power back ON.
Timing Chart

ON
Power supply
OFF

H
External (open)
diagnosis input
L

Interference light search

ON
Light emission
OFF
Normal operation

ON
Output
(both 1 and 2) OFF

Presence
Interference
light
Absence
Approx. 5 s Approx. 5 s

ON
Interference
light detection OFF
indicator

48
When a Failure Occurs Section 4-3

4-3 When a Failure Occurs

Lock-out Condition
The F3S-A stops machine operation with lock-out condition when it determines
that an unrecoverable failure has occurred. Terminate operation immediately
and replace the locked out emitter or receiver with a new one.

Status Indication Output 1 Output 2

Emitter lock-out
The sync signal to the LIGHT FAULT ON
emitter and receiver is OFF OFF
stopped. FAULT UNSTAB OFF

Timing Chart

ON
Power supply
OFF
Emitter failure

ON
Light emission
OFF

Emitter lockout Replace emitter.

ON
Output
(both 1 and 2)
OFF

Receiver OFF-hold

Status Indication Output 1 Output 2

Receiver lock-out
Receiver output is OFF LIGHT FAULT ON
and the sync signal to OFF OFF
the emitter on the FAULT UNSTAB OFF
slave end is stopped.

Timing Chart

ON
Power supply
OFF

ON
Light emission
OFF

Receiver failure

ON
Output
(both 1 and 2)
OFF

Receiver lockout Replace receiver

49
When a Failure Occurs Section 4-3

OFF-hold Condition
The F3S-A stops machine operation with OFF-hold condition when it deter-
mines that a temporary, recoverable failure, such as an incorrect cord connec-
tion, short, broken wire, noise, power ON timing mismatch or shorted output
load, has occurred.

Status Indication Output 1 Output 2

Emitter OFF-hold
The sync signal to the LIGHT FAULT ON
emitter and receiver is OFF OFF
stopped. FAULT UNSTAB OFF

Timing Chart

ON
Power supply

OFF
Emitter failure

ON
Light emission
OFF

Emitter OFF hold Recovery Normal operation

ON
Output
(both 1 and 2) OFF

Status Indication Output 1 Output 2

Receiver OFF-hold
Receiver outputs are LIGHT FAULT ON
OFF and the sync
OFF OFF
signal to the emitter on FAULT UNSTAB OFF
the slave end is
stopped.

Timing Chart

ON
Power supply
OFF

ON

Light emission
OFF

Receiver failure

ON
Output
(both 1 and 2)
OFF

Receiver OFF hold Recovery Normal operation

50
When a Failure Occurs Section 4-3

When a Failure Occurs with Connection

Series Connection
When an emitter goes to OFF-hold or lock-out condition, all remaining emitters
and receivers will go to OFF-hold condition.

When a receiver goes to OFF-hold or lock-out condition, all remaining receivers

will go to OFF-hold condition.

Parallel Connection
When an emitter goes to OFF-hold or lock-out condition, all emitters and receiv-
ers on the slave end of that emitter will go to OFF-hold condition. All emitters and
receivers on the master end of the emitter will continue to operate normally.

When a receiver goes to OFF-hold or lock-out condition, all emitters and receiv-
ers on the slave end of that receiver will go to OFF-hold condition. All emitters
and receivers on the master end of the receiver will continue to operate normally.

Mixed Connection
The following table summarizes the OFF-hold condition of emitters and receiv-
ers affected by an emitter or receiver that goes to OFF-hold or lock-out condition.

See Executing Order for the Light Emitting and Light Receiving Function under
3-2 Configuration for more details on sensor IDs A1, A2 to D4.
OFF-hold Condition of Emitters and Receivers affected by
a Sensor that goes to OFF-hold or Lock-out Condition
A A A A A A B B B B B B C C C C C C D D D D D D
1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
E E E R R R E E E R R R E E E R R R E E E R R R
A1 E
A2 E
A3 E
A1 R
A2 R
A3 R
B1 E
B2 E
B3 E
Sensor (Emitter B1 E
or Receiver) B2 R
that goes to B3 R
OFF-hold or C1 E
Lock-out C2 E
Condition C3 E
C1 R
C2 R
C3 R
D1 E
D2 E
D3 E
D1 R
D2 R
D3 R
E: Emitter FS-Ajjj-L R: Receiver F-Ajjj-D
: Sensor goes to : Sensor continues
OFF-hold condition to operate normally

51
I/O Circuits Section 4-4

4-4 I/O Circuits

Circuit Diagram

Light Fault
indicator indicator

Brown +24 V

External diagnosis
Sync Gray
input *2
line 2 Gray/Black Pink
Main emitter
Red circuit
Red/Black
Violet *1

Blue 0V

Sync
line 1

ON-state OFF-state Instability Fault

indicator indicator indicator indicator

Brown

Red/
Black
Red
Main receiver Black
Gray/Black circuit 1
Sync *3 Output 1
line 2 Gray

Load 1

White
Main receiver
circuit 2 *3 Output 2

Load 2

Blue

*1 Master: Connect to 0V
Slave: Open
*2 Short: Normal light emission
Open: External diagnosis function or interference light search function
*3 Cannot be used for NPN output.

52
I/O Circuits Section 4-4

Output Waveform with Output ON

The output transistor will be OFF for a maximum of 210 µs as shown in the fol-
lowing table in order to perform output circuit self diagnosis when the sensor is
receiving light. The output circuit is diagnosed as proper when this OFF signal is
fed back. If the output signal does not contain an OFF signal, the receiver deter-
mines that there is an output circuit or wiring failure and goes to OFF-hold condi-
tion.
The width and number of OFF signals are determined by the number of sensors
connected in series. (See the table below.)
Check the input response time of a machine connected to the F3S-A carefully to
ensure the machine will not malfunction due to the OFF signal.
Light
Light receiving reception
status interrupted
20 ms max.
9.6 ms
Stable light reception a
55 ms max. a
a

ON
Output transistor
OFF

Number of sensors 1 2 3
connected in series
Number of pulses per 9.6 ms 3 to 4 6 to 8 9 to 12
(number of a)
Pulse width at a(µs) 35 to 70 35 to 140 35 to 210
Total time of pulse widths per 9.6 ms 200 max. 400 max. 600 max.
(sum of a: µs )

53
 SECTION 5
Applications
This section shows examples of a motor control system that combines an F3S-A
and a G9S-301 safety relay unit.
These are category 4 systems (EN954-1 provision).
Notes
• Be sure to use DC-voltage power supplies for the safety relay unit and con-
tactors KM1, KM2, KM4, and KM5.
• Always use separate power supplies for the F3S-A and other equipment.

(1) 1 Set
Time Chart
F3S-A output 1/2
Reset switch
Emitter Receiver
K3 N.C. contact
K3 N.O. contact
K1, K2 N.C. contact
K1, K2 N.O. contact
KM1, KM2 N.C. contact

KM1, KM2 N.O. contact

F3S-A PLC input
PLC output
KM3

3-phase 4-wire model

Shield Shield 277/480 V max.

Red Feedback
loop
White
Brown

Brown
Black
Gray/Black

Gray/Black
Blue

Gray
Blue
Violet
Gray

Pink

Red/
Black
Open
Open

Open
Open

G9S-301

S1: Reset switch E1: 24 VDC Power Supply (S82K)

Note: E1 can be mounted on the F3S-A only
KM1, KM2: Electromagnet contactor
(LP1D) E2: 24 VDC Power Supply (S82K)

KM3: Solid-state contactor (G3J) PLC: Programmable Logic Controller (Used

for monitoring. This is not a part of a
M: 3-phase motor safety system.)

55
56
Emitter Receiver Emitter Receiver
Time Chart

F3S-A (A1) output 1/2 F3S-A (B1) output 1/2

Reset switch S1 Reset switch S2

K3 N.C. contact K3 N.C. contact

K3 N.O. contact K3 N.O. contact
G9S-301 G9S-301
A1 B1 (A1) K1, K2 N.C. contact (B1)
K1, K2 N.C. contact
F3S-A F3S-A K1, K2 N.O. contact K1, K2 N.O. contact
(2) Parallel Connection

KM1, KM2 N.C. contact KM4, KM5 N.C. contact

KM1, KM2 N.O. contact KM4, KM5 N.O. contact

PLC input 1 PLC input 2

Shield Shield Shield Shield PLC output 1 PLC output 2

Red Gray Red KM3 KM6

Red Gray Red

Blue

Pink
/Black /Black

Pink
Blue

Blue

Gray
Blue
Gray

Brown
Black
White
Violet
/Black

White
Black

Violet
Brown

Brown

Brown

Gray/Black
Gray/Black

Open
Open
Open
Open

Open
3-phase 4-wire model 3-phase 4-wire model
277/480 V max. 277/480 V max.

1 2 2 1

KM3 KM6

S1 Feedback S2 Feedback
loop loop

KM1 KM4

KM2 KM5

KM1 KM4

KM2 KM5

M1 M2

S1, S2: Reset switch

KM1, KM2, KM4, KM5: Electromagnet contactor (LP1D)
KM3, KM6: Solid-state contactor (G3J)
M1, M2: 3-phase motor
A1 B1
E1: 24 VDC Power Supply (S82K) Note: E1 can be mounted on F3S-A only
G9S-301 G9S-301 E2: 24 VDC Power Supply (S82K)

KM2
PLC: Programmable Logic Controller (Used for monitoring. This is not a
KM1 KM4 KM5 part of a safety system.)
 SECTION 6
Maintenance

! WARNING
Do not use the F3S-A until the following inspections are completed. Failure to do so
may result in loss of life or serious injury.

Note 1. For safety, be sure to record and store inspection results.

2. Make sure you are thoroughly familiar with the F3S-A and the machine prior
to conducting an inspection.
3. If the installer, design technician and user are different individuals, make
sure the user has adequate guidelines for performing maintenance.

6-1 Daily Inspections

Be sure to inspect the following items at the start of work or after a shift change.
1. j No intrusion paths into dangerous machine parts except through the
F3S-A detection zone.
2. j Some part of the operator’s body remains in the F3S-A detection zone
at all times while working in dangerous machine parts.
3. j The actual safety distance is greater than the calculated distance.
4. j No dirt or scratches on the optical surface or protective cover (F39-HA
optional) of the F3S-A.
5. j The test rod is not deformed.
6. j Make sure there is nothing in the detection zone. The light indicator
(orange) for the emitter and the ON-state indicator (green) for the re-
ceiver will light within 5 seconds after F3S-A power is turned ON.
7. j The test rod can be detected directly in front of the emitter (A), directly
in front of the receiver (B) and midway between the emitter and receiv-
er (C).
In other words, the OFF-state indicator (red) for the receiver will light
when the test rod is inserted into the detection zone.
*When using an F3S-Ajj1 and F3S-Ajj2 together, use the correct
test rod for each type of sensor because the diameters of the test rods
are different.
F3S-Ajj1: 15-mm diameter test rod ID No. 2988969-9
F3S-Ajj2: 25-mm diameter test rod ID No. 2988970-2

(A)

(C)

(B) Test rod

Emitter

Receiver

57
Inspection Every Six Months Section 6-2

Operate the machine and check to see if the dangerous part stops under the
conditions below.
8. j The dangerous part moves when there is nothing in the detection zone.
9. j The dangerous part stops immediately when the test rod is inserted
into the detection zone directly in front of the emitter, directly in front of
the receiver and midway between the emitter and receiver. (Use the
correct test rod as explained in 7.)
10. j The dangerous part remains stopped as long as the test rod is present
in the detection zone.
11. j The dangerous part will stop when the power supply is turned off with
nothing in the detection zone.

6-2 Inspection Every Six Months

Inspect the following items every six months or when a machine setting is
changed.
1. j Machine structure does not hinder stop and other safety functions.
2. j There is no machine modification or connection change that will ad-
versely affect the control system.
3. j F3S-A outputs are correctly wired to the machine.
4. j The actual overall response time of the machine is less than the calcu-
lated response time.
5. j The control relay and contactor are good condition.
6. j The brackets, cap unit and cord cap are secured tightly.
7. j There is no interference light. (Carry out the interference light search
function.)

6-3 Replacement
If the protective cover (F39-HAj optional) of the F3S-A is extremely dirty or
scratched, F3SA will stop activating outputs. In this case, replace it with a new
cover. The protective cover can be snapped onto the light curtain.

58
 SECTION 7
Accessories (Optional)

Extension Cord (Emitter and Receiver Set)

Type Length Specification
F39-JA1A 3m Relaying
y g connector type
y
F39-JA2A 7m
F39-JA3A 10 m

Series Connection Cord (Emitter and Receiver Cords, 1 Each Forms a Set)
Type Length
F39-JA1B 200 mm

Protective Cover
(Emitter and Receiver Covers, 1 Each Forms a Set, Material: Acrylic)
Unit: mm
Type Applicable Models L
F39-HA1 F3S-A161, F3S-A082 185
F39-HA2 F3S-A321, F3S-A162 345
F39-HA3 F3S-A481, F3S-A242 505
F39-HA4 F3S-A322 664
F39-HA5 F3S-A482 984

59
 SECTION 8
Troubleshooting

Symptoms
Emitter Problems
Symptoms Cause and Remedy
(See item number)
No indicator lights. 1
The light indicator (orange) flashes even though the external diagnosis function 2
and interference light search function are not selected.
The external diagnosis function and interference light search function cannot be 3
selected. (The light indicator (orange) lights without ever flashing.)
OFF-hold condition. (The fault indicator (yellow) flashes and the light indicator 1, 2, 4, 5, 6, 7, 12
(orange) flickers.)
Lock-out condition. (The fault indicator (yellow) lights and the light indicator 8
(orange) flickers.)

Receiver Problems
Symptoms Cause and Remedy
(See item number)
No indicator lights. 1
No light emission. (The ON-state indicator (green) does not light, only the OFF-state 2, 9, 10, 11, 3
indicator (red) lights.)
Unstable light emission. (The ON-state indicator (green) lights, and the instability 9, 10, 13
indicator (orange) lights or flashes.)
The fault indicator (yellow) and OFF-state indicator (red) flash even though the 2
interference light search function is not selected.
The interference light search function cannot be selected. (The OFF-state indicator 3
(red) lights without ever flashing.)
OFF-hold condition. (The fault indicator (yellow) flashes, the OFF-state indicator 1, 4, 5, 6, 7, 12, 14, 15, 21
(red) lights and the instability indicator (orange) flickers.)
Lock-out condition. (The fault indicator (yellow) flashes, the OFF-state indicator 8
(red) lights and the instability indicator (orange) flickers.)
Output load condition and indicator status are mismatched. (The OFF-state 16
indicator (red) lights when load current flows and the ON-state indicator (green)
lights when load current is not flowing.
Indicators are operating normally according to light emission status, but current is 17
not flowing to the load.
Indicators are operating normally according to light emission status, but current 18
continues flowing to the load.
Output is OFF with series connection even with light emitting (ON-state indicator 19
(green) lights).
The interference light search function continues operating and normal operation 20
cannot be returned with parallel connection even though power is turned back ON
with the external diagnosis input terminal connecting to 0V after the function is
terminated.

61
Cause and Remedy

No. Cause and Remedy

1.Power Supply Failure Cause:
The F3S-A and power supply are not wired correctly. (Wiring reversed, etc.)
The +24V line is shorted to the 0V line or protective earth (PE). Voltage on the
primary side of the power supply failed. The power supply is damaged.
The connector between the main unit and the extension cord is loose.
The power supply has an insufficient capacity.
The PE and FG terminals of the power supply are not properly connected to PE.
Remedy:
Securely connect an appropriate power supply.

2.Open External Diagnosis Input Cause:

The external diagnosis input terminal of the emitter is open or shorted to the +24V
line. If a switching element is used for external diagnosis input, then the switching
element is damaged.
More than 8 hours elapsed since the interference light search function was selected.
Remedy:
Make sure the external diagnosis input terminal is securely connected to the 0V line.
3.Shorted External Diagnosis Cause:
Input The external diagnosis input terminal of the emitter is shorted to the 0V line or
protective earth (PE).
If a switching element is used for external diagnosis input, then the switching element
is damaged.
Remedy:
Make sure the external diagnosis input terminal is clearly open or apply at least 9 to
24 V.

4.Master Selection Input Wiring Cause:

Error The master selection input terminal is open if it is a master emitter.
The master selection input terminal is connected to the 0V line if it is a slave emitter.
Remedy:
Wire the master selection input terminal correctly.

5.Sync Line Wiring Error Cause:

The sync line between the emitter and receiver is broken.
The sync line between the emitter and receiver is shorted to the +24V line, 0V line or
protective earth (PE).
The sync line for parallel connection is broken.
The sync line for parallel connection is shorted to the +24V line, 0V line or protective
earth (PE). The sync line is wired incorrectly.
The cap screws for the series connection cord are loose.
Remedy:
Reconnect correctly.
(The F3S-A may be damaged if the sync line is shorted to the +24V line, 0V line or
protective earth (PE).)
6.Connection Sensor Failure Cause:
Other F3S-A which is connected is in OFF-hold or lock-out condition.
Remedy:
Depending on the error condition, take steps 4, 5, 7, 8, 14, and 15 in order starting
from the master emitter end.
7.Power ON Sequence Cause:
The power supply is not shared by emitters and receivers.
The power supply is not shared by all connected F3S-As.
Remedy:
Connect all F3S-As to the same power supply.

62
 No. Cause and Remedy
8.Lock-out Cause:
Damaged F3S-A.
Remedy:
Terminate F3S-A operation immediately and turn the power OFF.
9.Dirt Cause:
Dirty optical surface.
Light interrupting object in the detection zone.
Remedy:
Clean the optical surface.
10.Intense Interference Light Cause:
Extremely intense interference light such as sunlight is striking the optical surface of
the receiver.
Remedy:
Interrupt the interference light.
11.Series Connection Sensor (With series connection)
Failure Cause:
The F3S-A at the series extension end is interrupted.
Remedy:
None. Normal operation.
12.Noise Cause:
Significant noise.
Remedy:
If high-tension and power lines are run in the same duct, use other wiring or
individual wiring ducts.
Make sure no transceivers or cellular phones are being used near the F3S-As.
13.Improper Optical Axis Cause:
Adjustment The optical axis adjustment is incorrect.
Remedy:
Readjust the optical axis.
14.Shorted Output Cause:
At least one output is shorted to the +24V line, 0V line or protective earth (PE).
Outputs are shorted together.
Remedy:
Rewire the output correctly.
(The F3S-A may be damaged if an output line is shorted to the +24V line.)
15.Interference Light Cause:
Interference light is received.
(Result of checking using the interference light search function.)
Remedy:
Interrupt the interference light.
If another F3S-A is the cause of the interference light, connect sync lines.
16.Load Wiring Error Cause:
The load is connected between the output line and +24V line.
Remedy:
Connect the load between the output line and the 0V line.
17.Load Wiring Error Cause:
The output line is not connected to the load.
The output line is broken.
Remedy:
Rewire the line correctly.
18.Load Wiring Error Cause:
The load is connected to a +24V line without being connected to an output line.
Remedy:
Rewire the line correctly.

63
 No. Cause and Remedy
19.Master-end Sensor (With series connection)
Interrupted Cause:
The F3S-A on the master end is interrupted.
Remedy:
None. Normal operation.
20.External Diagnosis Input Cause:
Wiring Error The external diagnosis input terminals on the emitters are not connected together.
(With parallel connection) Remedy:
Connect the external diagnosis input terminals together.
21. Extension Cord Connection Cause:
Error The receiver extension cord is connected to the emitter and the emitter extension
cord is connected to the receiver.
Remedy:
Connect the extension cords properly.

64
 SECTION 9
Indicator and Output Table

Not lit Flashing Lit Flickering

Functions and Indicators

conditions
di i O tp t 1
Output O tp t 2
Output
Emitter Receiver
Stable light reception
LIGHT FAULT ON
ON ON
FAULT UNSTAB OFF

Unstable light reception

LIGHT FAULT ON

FAULT UNSTAB OFF ON ON

Flickers as the light
status approaches
stability
Light interrupted
LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

External diagnosis
LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

Interference (light search

function): LIGHT FAULT ON
No interference light OFF OFF
FAULT UNSTAB OFF

Interference (light search

function): LIGHT FAULT ON
With interference light OFF OFF
FAULT UNSTAB OFF

OFF-hold condition:
Emitter fault LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

OFF-hold condition:
Receiver fault LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

Lockout condition:
Emitter fault LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

Lockout condition:
Receiver fault LIGHT FAULT ON
OFF OFF
FAULT UNSTAB OFF

65
 SECTION 10
Glossary

Safety distance The minimum distance that must be maintained between the detection zone of
the F3S-A and a dangerous machine part in order to stop a machine before
someone or something reaches it.

Lock-out A safety feature of the F3S-A. The F3S-A stops machine operation with lock-out
if it determines from self diagnosis that an irrecoverable failure has occurred. If
an emitter is on lock-out condition, it will stop emitting light. If a receiver is on
lock-out condition, output from the receiver will be turned OFF. Normal operation
will not resume after lock out. In this case, terminate operation immediately and
replace the locked out end with a new part.

OFF-hold A safety feature of the F3S-A. The F3S-A stops machine operation with OFF-
hold if it determines that a failure discovered as a result of self diagnosis is tem-
porary and recoverable. If an emitter is on OFF-hold condition, it will stop emit-
ting light. If a receiver is on OFF-hold condition, output from the receiver will be
turned OFF. Eliminate the cause of the failure and turn F3S-A power back ON to
resume normal operation.

Master sensor When multiple F3S-As are connected together, one sensor called the master
sensor will control timing for all emission and receive processing in the system.

Master end/slave end With parallel connection, the master sensor end is called the master end and the
other end is called the slave end.

Master end/series With series connection, the end closest to the master sensor is called the master
extension end end the other end is called the series extension end.

Protective height The length of the F3S-A from the first optical axis to the last optical axis. The
height is marked on the F3S-A.

Detection distance The distance between facing emitters and receivers.

Detection zone The area where one pair of F3S-As can detect intrusion by people or objects.
Full coverage is the product of protective height and detection distance.

Test rod The rod is used to check the detection capability of the F3S-A and corresponds
to the optical resolution of the F3S-A. Rods are available in 15-mm and 25-mm
diameters provided as accessories for the F3S-Ajj1 (10-mm pitch) and the
F3S-Ajj2 (20-mm pitch), respectively.

EN954-1 The European standard that provides machine safety, especially categories and
risk assessment methods for safety-related areas of control systems.

prEN999 The European standard that provides machine safety, especially protective ma-
chines as it relates to machine approach procedures and speed.

IEC61496-1, -2 The international standard that provides machine safety, especially to electro-
sensitive protective machines. IEC61496-1 provides requirements for failure
mode and effect analysis, environmental requirements, as well as EMC require-
ments. IEC61496-2 provides effective aperture angles for optical-type protec-
tive equipment as well as requirements related to interference light protection.
EN61496-1 is an EN standard that has about the same contents as IEC61496-1.

ANSI B11.19 The ANSI standard that provides machine safety, especially the general require-
ments when referenced by other B11 standards.

67
External Diagnosis The function used to check receiver operation by turning OFF light emission.
Function

Interference Light Search The function used to check the presence or absence of interference light that
Function may cause faulty operation.
ESPE Abbreviation for electro-sensitive protective equipment.
AOPD Abbreviation for active opto-electronic protective devices.

68
 SECTION 11
Referenced Standards

International Standards
- IEC61496-1 Safety of Machinery: Electro-sensitive Protective Equipment – Part 1: General Require-
ments and Tests
- IEC61496-2 Safety of Machinery: Electro-sensitive Protective Equipment – Part 2: Particular Require-
ments for Equipment Using Active Opto-electronic Protective Devices
European Standards
- EN61496-1 Safety of Machinery: Electro-sensitive Protective Equipment – Part 1: General Require-
ments and Tests
- EN415-4 Palletizers and Depalletizers
- prEN691 Woodworking Machines
- EN692 Mechanical Presses
- prEN693 Hydraulic Presses
U.S. Federal Regulations
- OSHA 29 CFR 1910.212 General Requirements of All Machines
- OSHA 29 CFR 1910.217 Mechanical Power Presses
U.S. National Standards
- ANSI B11.1 Mechanical Power Presses
- ANSI B11.2 Hydraulic Power Presses
- ANSI B11.3 Power Press Brakes
- ANSI B11.4 Shears
- ANSI B11.5 Iron Workers
- ANSI B11.6 Lathes
- ANSI B11.7 Cold Headers and Cold Formers
- ANSI B11.8 Drilling, Milling, and Boring Machines
- ANSI B11.9 Grinding Machines
- ANSI B11.10 Metal Sawing Machines
- ANSI B11.11 Gear Cutting Machines
- ANSI B11.12 Roll Forming and Roll Bending Machines
- ANSI B11.13 Single- and Multiple-Spindle Automatic Bar and Chucking Machines
- ANSI B11.14 Coil Slitting Machines/Systems
- ANSI B11.15 Pipe, Tube, and Shape Bending Machines
- ANSI B11.16 Metal Powder Compacting Presses
- ANSI B11.17 Horizontal Extrusion Presses
- ANSI B11.18 Machinery and Machine Systems for the Processing of Coiled Strip, Sheet, and Standards
- ANSI B11.19 Performance Criteria for the Design, Construction, Care, and Operation of Safeguarding
when Referenced by the Other B11 Machine Tool Safety Standards
- ANSI/RIA 15.06 Safety Requirements for Industrial Robots and Robot Systems
- UL1998 Safety-related Software

69