Chapter

4
Configuration
and Connections
In This Chapter...
In this Chapter............................................................................................................................... 4-1
DL05 System Design Strategies.............................................................................................. 4-2
Network Configuration and Connections.............................................................................. 4-4
Network Slave Operation........................................................................................................... 4-8
Network Master Operation......................................................................................................4-14
Chapter 4: Configuration and Connections

DL05 System Design Strategies

I/O System Configurations
The DL05 PLCs offer a number of different I/O configurations. Choose the
configuration that is right for your application, and keep in mind that the DL05 PLCs
offer the ability to add an I/O card in the option slot. Although remote I/O isn’t
available, there are several option cards available. For instance:
• Various A/C and Dv/C I/O modules
• Combination I/O modules
• Analog I/O modules
• Combination Analog I/O modules
A DL05 system can be developed with an arrangement using a selected option
modules. See our DL05/06 Options Modules User Manual (D0-OPTIONS-M) on the
website,
www.automationdirect.com for detailed selection information.
Networking Configurations
The DL05 PLCs offers the following ways to add networking:
• Ethernet Communications Module – connects a DL05 to high-speed peer-
to-peer networks. Any PLC can initiate communications with any other PLC
or operator interfaces, such as C-more, when using the ECOM modules.
• Data Communications Modules – connects a DL05 to devices using either
DeviceNet or Profibus to link to master controllers, as well as a D0-DCM.
• Communications Port 1 – The DL05 has a 6-pin RJ12 connector on Port 1
that supports (as slave) K-sequence, Modbus RTU or DirectNET protocols.
• Communications Port 2 – The DL05 has a 6-pin RJ12 connector on Port 2
that supports either master/slave Modbus RTU or DirectNET protocols, or
K-sequence protocol as slave.
Port 2 can also be used for
ASCII OUT communications.

Option Slot

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 Chapter 4: Configuration and Connections

Automatic I/O Configuration

The DL05 CPUs will automatically detect the optional I/O module, if installed,
at powerup and establish the correct I/O configuration and addresses. The
configuration may never need to be changed.
The I/O addresses use octal numbering, with X0 to X7 being the eight inputs and Y0
to Y5 being the addresses for the six outputs. The discrete option slot addresses are
assigned in groups of 8 or 16 depending on the number of I/O points for the I/O
module. The discrete option module addressing will be X100 to X107 and X110 to
X117 for the maximum sixteen point input module. The addressing for the sixteen
point output module will be Y100 to Y107 and Y110 to Y117. Refer to the DL05/06
Options Modules User Manual (D0-OPTIONS-M) for the various discrete I/O
modules available and the addressing for each one.
Power Budgeting
No power budgeting is necessary for the DL05. The built-in power supply is
sufficient for powering the base unit, your choice of option module, the handheld
programmer and the DV-1000 operator interface.

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Chapter 4: Configuration and Connections

Network Configuration and Connections

Configuring the DL05’s Comm Ports
This section describes how to configure the CPU’s built-in networking ports for
either Modbus or DirectNET. This will allow you to connect the DL05 PLC system
directly to Modbus networks using the RTU protocol, or to other devices on a
DirectNET network. Modbus host systems must be capable of issuing the Modbus
commands to read or write the appropriate data. For details on the Modbus
protocol, check with your Modbus supplier for the latest version of the Gould
Modbus Protocol reference Guide. For more details on DirectNET, order our
DirectNET manual, part number DA–DNET–M.
Communications Port 1 Communications Port 2
Connects to HPP, DirectSOFT, operator interfaces, etc. Connects to HPP, DirectSOFT, operator interfaces, etc.
6-pin, RS232C 6-pin, multifunction port, RS232C
Communication speed: 9600 Baud (fixed) Communication speed (baud): 300, 600, 1200, 2400,
4800, 9600, 19200, 38400
Parity: odd (fixed)
Parity: odd (default), even, none
Port 1 Station Address: 1 (fixed)
8 data bits Port 2 Station Address: 1 (default)
8 data bits
1 start, 1 stop bit
1 start, 1 stop bit
Asynchronous, half-duplex, DTE Asynchronous, half-duplex, DTE
Protocol (auto-select): K-sequence (slave only),
DirectNET (slave only), Modbus RTU (slave only) Protocol (auto-select): K-sequence (slave only),
DirectNET (master/slave), Modbus RTU (master/slave),
non-sequence/print

Port 1 Pin Descriptions Port 2 Pin Descriptions

1234 5 6 1 0V Power (–) connection (GND) 1 0V Power (–) connection (GND)
2 5V Power (+) connection 2 5V Power (+) connection
3 RXD Receive Data (RS232C) 3 RXD Receive Data (RS232C)
4 TXD Transmit Data (RS232C 4 TXD Transmit Data (RS232C
5 5V Power (+) connection 5 RTS Request to Send
DL05 Port
6 0V Power (–) connection (GND) 6 0V Power (–) connection (GND)

Specifications
Networking DL05 to DL05 RS-232C
You will need to make sure the network connection is a 3-wire RS–232 type. The
recommended cable is AutomationDirect L19772 (Belden 8102) or equivalent.
Normally, the RS–232 signals are used for communications between two devices
with distances up to a maximum of 15 meters.

DL05 DL05
PORT 2 PORT 1 or 2
1 0V 0V 1
3 RXD RXD 3
4 TXD TXD 4

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 Chapter 4: Configuration and Connections

Networking Using RS–422 Converters

Networking
PC to DL05s
1234 5 6
RS–422

6-pin Female
Modular Connector

FA-ISOCON DL05
GND
1 or 6 0V 0V 1 or 6 PORT 2
GND
0V 0V 1
TXD+ RXD+ 3 RXD RXD 3
RXD RXD 3
TXD– RXD– 4 TXD TXD 4
TXD TXD 4 RXD– TXD–
2 CTS 5V 2
RTS RTS 5 RXD+ TXD+
5 5V RTS 5

FA–ISOCON

Note: When using the DL05 on a multi-drop

network, the RTS ON Delay time must be set
to at least 5ms and the RTS OFF Delay time FA-ISOCON DL05
must be set to at least 2ms . If you encounter GND
1 or 6 0V 0V 1 or 6 PORT 2
problems, the time can be increased. RXD+ 3 RXD RXD 3
RXD– 4 TXD TXD 4
TXD–
2 CTS 5V 2
TXD+
Networking 5 5V RTS 5
DL05 Master
to Other PLCs
The recommended cable for RS-422 is
AutomationDirect L19772 (Belden 9729) or
equivalent. The maximum cable distance
is 1000 meters.

CPU Specifications
DL05 FA-ISOCON DL05
PORT 2 1 or 6 0V 0V 1 or 6 PORT 2
GND GND
1 or 6 0V 0V 1 or 6 3 RXD RXD 3
TXD+ RXD+
3 RXD RXD 3
TXD– RXD– 4 TXD TXD 4
4 TXD TXD 4 RXD– TXD–
2 CTS 5V 2
2 CTS RXD+ TXD+
5V 2
5 5V RTS 5
5 5V RTS 5
FA–ISOCON

FA-ISOCON DL240
GND
1 0V 0V 1 PORT 2
RXD+ 3 RXD RXD 3
RXD– 4 TXD TXD 4
TXD–
2 CTS 5V 2
TXD+
5 5V RTS 5

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Chapter 4: Configuration and Connections

Modbus Port Configuration

In DirectSOFT, choose the PLC menu, then Setup, then “Secondary Comm Port”.
• Port: From the port number list box at the top, choose “Port 2”.
• Protocol: Click the check box to the left of “Modbus” (use AUX 56 on the
HPP, and select “MBUS”), and then you’ll see the dialog box below.

• Timeout: Amount of time the port will wait after it sends a message to get a
response before logging an error.
• RTS ON / OFF Delay Time: The RTS ON Delay Time specifies the time the DL05
waits to send the data after it has raised the RTS signal line. The RTS OFF Delay
Time specifies the time the DL05 waits to release the RTS signal line after the
data has been sent. When using the DL05 on a multi-drop network, the RTS ON Delay
time must be set to at least 5ms and the RTS OFF Delay time must be set to at least 2ms. If you
encounter problems, the time can be increased.
• Station Number: The possible range for Modbus slave numbers is from 1 to
247, but the DL05 network instructions used in Master mode will access only
slaves 1 to 99. Each slave must have a unique number. At powerup, the port is
automatically a slave, unless and until the DL05 executes ladder logic network
instructions which use the port as a master. Thereafter, the port reverts back to
slave mode until ladder logic uses the port again.
• Baud Rate: The available baud rates include 300, 600, 1200, 2400, 4800, 9600,
19200, and 38400 baud. Choose a higher baud rate initially, reverting to lower
baud rates if you experience data errors or noise problems on the network.
Important: You must configure the baud rates of all devices on the network to
the same value. Refer to the appropriate product manual for details.
• Stop Bits: Choose 1 or 2 stop bits for use in the protocol.
• Parity: Choose none, even, or odd parity for error checking.
Then click the button indicated to send the Port configuration to the CPU, and
click Close.

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 Chapter 4: Configuration and Connections

DirectNET Port Configuration

In DirectSOFT, choose the PLC menu, then Setup, then “Secondary Comm Port”.
• Port: From the port number list box, choose “Port 2”.
• Protocol: Click the check box to the left of “DirectNET” (use AUX 56 on the
HPP, then select “DNET”), and then you’ll see the dialog box below.

• Timeout: Amount of time the port will wait after it sends a message to get a
response before logging an error.
• RTS ON / OFF Delay Time: The RTS ON Delay Time specifies the time the DL05
waits to send the data after it has raised the RTS signal line. The RTS OFF Delay
Time specifies the time the DL05 waits to release the RTS signal line after the
data has been sent. When using the DL05 on a multi-drop network, the RTS ON Delay
time must be set to at least 5ms and the RTS OFF Delay time must be set to at least 2ms. If you
encounter problems, the time can be increased.
• Station Number: For making the CPU port a DirectNET master, choose “1”. The
allowable range for DirectNET slaves is from 1 to 90 (each slave must have a
unique number). At powerup, the port is automatically a slave, unless and until
the DL05 executes ladder logic instructions which attempt to use the port as a
master. Thereafter, the port reverts back to slave mode until ladder logic uses
the port again.
• Baud Rate: The available baud rates include 300, 600, 1200, 2400, 4800, 9600,
19200, and 38400 baud. Choose a higher baud rate initially, reverting to lower
baud rates if you experience data errors or noise problems on the network.
Important: You must configure the baud rates of all devices on the network to
the same value.
• Stop Bits: Choose 1 or 2 stop bits for use in the protocol.
• Parity: Choose none, even, or odd parity for error checking.
• Format: Choose between hex or ASCII formats.
Then click the button indicated to send the Port configuration to the CPU, and click
Close.

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Network Slave Operation

This section describes how other devices on a network can communicate with a
CPU port that you have configured as a DirectNETslave or Modbus slave (DL05). A
Modbus host must use the Modbus RTU protocol to communicate with the DL05 as
a slave. The host software must send a Modbus function code and Modbus address
to specify a PLC memory location the DL05 comprehends. The DirectNET host uses
normal I/O addresses to access applicable DL05 CPU and system. No CPU ladder
logic is required to support either Modbus slave or DirectNET slave operation.
Modbus Function Codes Supported
The Modbus function code determines whether the access is a read or a write, and
whether to access a single data point or a group of them. The DL05 supports the
Modbus function codes described below.

MODBUS Function Code Function DL05 Data Types Available

01 Read a group of coils Y, CR, T, CT
02 Read a group of inputs X, SP
05 Set / Reset a single coil Y, CR, T, CT
15 Set / Reset a group of coils Y, CR, T, CT
03, 04 Read a value from one or more registers V
06 Write a value into a single register V
16 Write a value into a group of registers V

Determining the Modbus Address

There are typically two ways that most host software conventions allow you to
specify a PLC memory location. These are:
• By specifying the Modbus data type and address
• By specifying a Modbus address only
NOTE: For information about the Modbus protocol see the Group Schneider website at: www.schneiderautomation.
com. At the main menu, select Support/Services, Modbus, Modbus Technical Manuals, PI-MBUS-300 Modbus
Protocol Reference Guide or search for PIMBUS300. For more information about the DirectNET protocol, order our
DirectNET User Manual, DA-DNET-M, or download the manual free from our website: www.automationdirect.com.
Select Manuals\Docs\onlineusermanuals\misc.\DA-DNET-M

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 Chapter 4: Configuration and Connections

If Your Host Software Requires the Data Type and Address...

Many host software packages allow you to specify the Modbus data type and the
Modbus address that corresponds to the PLC memory location. This is the easiest
method, but not all packages allow you to do it this way.
The actual equation used to calculate the address depends on the type of PLC data
you are using. The PLC memory types are split into two categories for this purpose.
• Discrete – X, SP, Y, CR, S, T, C (contacts)
• Word – V, Timer current value, Counter current value
In either case, you basically convert the PLC octal address to decimal and add the
appropriate Modbus address (if required). The table below shows the exact equation
used for each group of data.

Modbus Address
DL05 Memory Type QTY (Dec.) PLC Range(Octal Modbus Data Type
Range (Decimal)
For Discrete Data Types .... Convert PLC Addr. to Dec. + Start of Range + Data Type
Inputs (X) 256 X0 – X377 2048 – 2303 Input
Special Relays(SP) 512 SP0 – SP777 3072 – 3583 Input
Outputs (Y) 256 Y0 – Y377 2048 – 2303 Coil
Control Relays (CR) 512 C0 – C777 3072 – 4583 Coil
Timer Contacts (T) 128 T0 – T177 6144 – 6271 Coil
Counter Contacts (CT) 128 CT0 – CT177 6400 – 6527 Coil
Stage Status Bits(S) 256 S0 – S377 5120 – 5375 Coil
For Word Data Types .... Convert PLC Addr. to Dec. + Data Type
Timer Current Values (V) 128 V0 – V177 0 – 127 Input Register
Counter Current Values (V) 128 V1000 – V1177 512 – 639 Input Register
V-Memory, user data (V) 3968 V1200 – V7377 640 – 3839 Holding Register
V-Memory, non-volatile (V) 128 V7600 – V7777 3968 – 4095 Holding Register

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The following examples show how to generate the Modbus address and data type
for hosts which require this format.
PLC Address (Dec) + Data Type
Example 1: V2100 V2100 = 1088 decimal
Find the Modbus address for
1088 + Hold. Reg. = HoldingReg1088
User V location V2100.
1. Find V memory in the table.
2. Convert V2100 into decimal (1088).

V Memory, user data (V) 3200 V1200 – V7377 640 – 3839 Holding Register

3. Use the Modbus data type from the table.

Example 2: Y20 PLC Address (Dec) + Start Addr + Data Type
Find the Modbus address for output Y20. Y20 = 16 decimal
1. Find Y outputs in the table. 16 + 2048 + Coil = Coil 2064
2. Convert Y20 into decimal (16).
3. Add the starting address for the range (2048).
4. Use the Modbus data type from the table.
Outputs (V) 256 Y0 – Y377 2048 - 2303 Coil

Example 3: T10 Current Value PLC Address (Dec) + Data Type

Find the Modbus address to obtain the T10 = 8 decimal
current value from Timer T10.
8 + Input Reg. = Input Reg. 8
1. Find Timer Current
Values in the table.
2. Convert T10 into decimal (8).
Timer Current Values (V) 128 V0 – V177 0 - 127 Input Register

3. Use the Modbus data type from the table.

Example 4: C54
Find the Modbus address for Control Relay PLC Address (Dec) + Start Addr. + Data Type
C54. C54 = 44 decimal
1. Find Control Relays in the table. 44 + 3072 + Coil = Coil 3116

2. Convert C54 into decimal (44).

3. Add the starting address for the range (3072).
Control Relays (CR) 512 C0 – C77 3072 – 3583 Coil

4. Use the Modbus data type from the table.

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 Chapter 4: Configuration and Connections

If Your Modbus Host Software Requires an Address ONLY

Some host software does not allow you to specify the Modbus data type and
address. Instead, you specify an address only. This method requires another step to
determine the address, but it’s still fairly simple. Basically, Modbus also separates
the data types by address ranges as well. So this means an address alone can
actually describe the type of data and location. This is often referred to as “adding
the offset”. One important thing to remember here is that two different addressing
modes may be available in your host software package. These are:
• 484 Mode
• 584/984 Mode
Werecommendthatyouusethe584/984addressingmodeifyourhostsoftwareallows
you to choose. This is because the 584/984 mode allows access to a higher number
of memory locations within each data type. If your software only supports 484
mode, then there may be some PLC memory locations that will be unavailable. The
actual equation used to calculate the address depends on the type of PLC data you
are using. The PLC memory types are split into two categories for this purpose.
• Discrete – X, SP, Y, CR, S, T (contacts), C (contacts)
• Word – V, Timer current value, Counter current value
In either case, you basically convert the PLC octal address to decimal and add the
appropriate Modbus addresses (as required). The table below shows the exact
equation used for each group of data.
Discrete Data Types
Address (484 Address Modbus Data
DL05 Memory Type PLC Range (Octal)
Mode) (584/984 Mode) Type
Inputs (X) X0 – X377 --- 12049 - 12304 Input
Special Relays (SP) SP0 – SP777 --- 13073 - 13584 Input
Outputs (Y) Y0 – Y377 2049 - 2304 2049 - 2304 Output
Control Relays (CR) C0 – C777 3073 - 3584 3073 - 3584 Output
Timer Contacts (T) T0 – T177 6145 - 6272 6145 - 66272 Output
Counter Contacts (CT) CT0 – CT177 6401 - 6528 6401 - 6528 Output
Stage Status Bits (S) S0 – S377 5121 - 5376 5121 - 5376 Output

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 Chapter 4: Configuration and Connections

Word Data Types

PLC Range (Octal) Input/Holding Input/Holding
Registers (484 Mode)* (584/984 Mode)*
V-Memory (Timers) V0 - V177 3001/4001 30001/40001
V-Memory (Counters) V1000 - V1177 3513/4513 30513/40513
V-Memory (Data Words) V1200 - V7377 3641/4641 30641/40641
*Modbus: Function 4

NOTE: For an automated MODBUS/KOYO address conversion utility, go to our website,

www.automationdirect.com, and download the EXCEL file: Modbus_conversion.xls located at:
Tech Support > Technical and Application Notes > ANMISC-010, under PLC Hardware
Communications.
* Modbus: Function 04
The DL05/06, DL250-1/260, DL350 and DL450 will support function 04, read input
register (Address 30001). To use function 04, put the number ‘4’ into the most
significant position (4xxx). Four digits must be entered for the instruction to work
properly with this mode.

The Maximum constant possible is 4128.

LD
This is due to the 128 maximum number
K101 of Bytes that the RX/WX instruction can
allow. The value of 4 in the most significant
LD position of the word will cause the RX to use
K4128 function 04 (30001 range).

LDA
O4000

RX
V0

1. Refer to your PLC user manual for the correct memory mapping size of your
PLC. Some of the addresses shown above might not pertain to your particular
CPU.
2. For an automated Modbus/Koyo address conversion utility, download the file
modbus_conversion.xls from the www.automationdirect.com website.

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Example 1: V2100 584/984 Mode

Find the Modbus address for user V-memory V2100.
PLCAddress(Dec)+ModeAddress
1. Find V memory in the table. V2100 = 1088 decimal
2. Convert V2100 into decimal (1088).
1088 + 40001 = 41089
3. Add the Modbus starting address for the
mode (40001).
For Word Data Types.... PLC Address (Dec.) + Appropriate Mode Address
Timer Current Values (V) 128 V0 – V177 0 – 127 3001 30001 Input Register
Counter Current Values (V) 128 V1200 – V7377 512 – 639 3001 30001 Input Register
V-Memory, user data (V) 1024 V2000 – V3777 1024 – 2047 4001 40001 Holding Register

Example 2: Y20 584/984 Mode

Find the Modbus address for output Y20.
1. Find Y outputs in the table. PLC Address (Dec) + Start Addr + Mode
2. Convert Y20 into decimal (16). Y20 = 16 decimal
3. Add the starting address 16 + 2048 + 1 = 2065
for the range (2048).
4. Add the
Modbus address for the mode (1).
Outputs (Y) 320 Y0 - Y477 2048 - 2367 1 1 Coil
Control Relays (CR) 256 C0 - C377 3072 - 3551 1 1 Coil
Timer Contacts (T) 128 T0 - T177 6144 - 6271 1 1 Coil

Example 3: T10 Current Value 484 Mode

Find the Modbus address to obtain the current value for PLCAddress(Dec)+ModeAddress
Timer T10. T10 = 8 decimal
1. Find Timer Current Values in the table. 8 + 3001 = 3009
2. Convert T10 into decimal (8).
3. Add the Modbus starting address for the mode (3001).v
For Word Data Types.... PLC Address (Dec.) + Appropriate Mode Address
Timer Current Values (V) 128 V0 – V177 0 – 127 3001 30001 Input Register
Counter Current Values (V) 128 V1200 – V7377 512 – 639 3001 30001 Input Register
V-Memory, user data (V) 1024 V2000 – V3777 1024 – 2047 4001 40001 Holding Register

Example 4: C54 584/984 Mode

Find the Modbus address for Control Relay C54.
PLC Address (Dec) + Start Addr + Mode
1. Find Control Relays in the table. C54 = 44 decimal
2. Convert C54 into decimal (44).
44 + 3072 + 1 = 3117
3. Add the starting address
for the range (3072).
4. Add the Modbus address for the mode (1).
Outputs (Y) 320 Y0 - Y477 2048 - 2367 1 1 Coil
Control Relays (CR) 256 C0 - C377 3072 - 3551 1 1 Coil
Timer Contacts (T) 128 T0 - T177 6144 - 6271 1 1 Coil

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Network Master Operation

This section describes how the DL05 PLC can communicate on a Modbus or
DirectNET network as a master. For Modbus networks, it uses the Modbus RTU
protocol, which must be interpreted by all the slaves on the network. Both Modbus
and DirectNET are single master/multiple slave networks. The master is the only
member of the network that can initiate requests on the network. This section
teaches you how to design the required ladder logic for network master operation.
FA-ISOCON

Modbus RTU Protocol, or DirectNET

Slave #1 Slave #2 Slave #3

Master

When using the DL05 PLC as the master station, simple RLL instructions are used to
initiate the requests. The WX instruction initiates network write operations, and the
RX instruction initiates network read operations. Before executing either the WX or
RX commands, we will need to load data related to the read or write operation onto
the CPU’s accumulator stack. When the WX or RX instruction executes, it uses the
information on the stack combined with data in the instruction box to completely
define the task, which goes to the port.
Network

WX (write)
RX (read)
Slave

Master

The following step-by-step procedure will provide you the information necessary to
set up your ladder program to receive data from a network slave.

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 Chapter 4: Configuration and Connections

Step 1: Identify Master Port # and F 2 0 1

Slave #
The first Load (LD) instruction identifies
the communications port number on the
network master (DL05) and the address Slave address (BCD)
of the slave station. This instruction can Port number (BCD)
address up to 99 Modbus slaves, or 90 Internal port (hex)
DirectNET slaves. The format of the word is
shown to the right. The “F2” in the upper
byte indicates the use of the right port of LD
the DL05 PLC, port number 2. The lower KF201
byte contains the slave address number in
BCD (01 to 99).
Step 2: Load Number of Bytes to 6 4 (BCD)
Transfer
The second Load (LD) instruction
determines the number of bytes which # of bytes to transfer
will be transferred between the master
and slave in the subsequent WX or RX LD
instruction. The value to be loaded is in K64
BCD format (decimal), from 1 to 128 bytes.

The number of bytes specified also depends on the type of data you want to obtain.
For example, the DL05 Input points can be accessed by V-memory locations or
as X input locations. However, if you only want X0 – X27, you’ll have to use the X
input data type because the V-memory locations can only be accessed in 2-byte
increments. The following tables shows the byte ranges for the various types of
DirectLOGIC™ products.
DL05/205/350/405 Memory Bits per unit Bytes
V-memory 16 2
T / C current value 16 2
Inputs (X, SP) 8 1
Outputs 8 1
(Y, C, Stage, T/C bits)
Scratch Pad Memory 8 1
Diagnostic Status 8 1

DL330/340 Memory Bits per unit Bytes

Data registers 8 1
T / C accumulator 16 2
I/O, internal relays, shift register bits, T/C 1 1
bits, stage bits
Scratch Pad Memory 8 1
Diagnostic Status(5 word R/W) 16 10

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Step 3: Specify Master Memory Area 4 0 6 0 0 (octal)

The third instruction in the RX or WX sequence is
a Load Address (LDA) instruction. Its purpose is
to load the starting address of the memory area Starting address of
to be transferred. Entered as an octal number, master transfer area
the LDA instruction converts it to hex and places
the result in the accumulator. LDA
O40600
For a WX instruction, the DL05 CPU sends the
number of bytes previously specified from its
memory area beginning at the LDA address MSB V40600 LSB
specified.
15 0
For an RX instruction, the DL05 CPU reads the V40601
number of bytes previously specified from the
MSB LSB
slave, placing the received data into its memory 15 0
area beginning at the LDA address specified.
NOTE: Since V-memory words are always 16 bits, you may not always use the whole word. For example, if you only
specify 3 bytes and you are reading Y outputs from the slave, you will only get 24 bits of data. In this case, only the 8
least significant bits of the last word location will be modified. The remaining 8 bits are not affected.

Step 4: Specify Slave Memory Area

The last instruction in our sequence is the WX SP116
LD
or RX instruction itself. Use WX to write to the KF201
slave, and RX to read from the slave. All four of
our instructions are shown to the right. In the LD
last instruction, you must specify the starting K64
address and a valid data type for the slave.
• DirectNET slaves – specify the same LDA
address in the WX and RX instruction O40600
as the slave’s native I/O address
• Modbus DL405, DL205, or DL05 RX
slaves – specify the same address Y0
in the WX and RX instruction as
the slave’s native I/O address
• Modbus 305 slaves – use the
following table to convert DL305 addresses to Modbus addresses

DL305 Series CPU Memory Type–to–Modbus Cross Reference (excluding 350 CPU)
Modbus Modbus
PLC Memory Type PLC Base Address PLC Memory Type PLC Base Address
Base Address Base Address
TMR/CNT Current R600 V0 TMR/CNT Status Bits CT600 GY600
Values
I/O Points IO 000 GY0 Control Relays CR160 GY160
Data Registers R401,R400 V100 Shift Registers SR400 GY400
Stage Status Bits
S0 GY200
(D3-330P only)

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 Chapter 4: Configuration and Connections

Communications from a Ladder Program

Typically network
communications will last longer
than 1 scan. The program must
wait for the communications to
finish before starting the next SP117
transaction.
Y1
SET

Port 2, which can be a master, SP116

LD
has two Special Relay contacts Port Communication Error
KF201

associated with it (see Appendix LD

D for comm port special
Port Busy K0003

relays). One indicates “Port LDA

busy”(SP116), and the other
O40600

indicates ”Port Communication RX

Error”(SP117). The example
Y0

above shows the use of these

contacts for a network master
that only reads a device (RX).
The “Port Busy” bit is on while
the PLC communicates with the slave. When Interlocking Relay
the bit is off the program can initiate the SP116 C100
next network request. LD
KF201
The “Port Communication Error” bit turns
on when the PLC has detected an error. Use LD
of this bit is optional. When used, it should K0003
be ahead of any network instruction boxes
since the error bit is reset when an RX or
LDA
O40600
WX instruction is executed.
Multiple Read and Write Interlocks Interlocking
RX
VX0
If you are using multiple reads and writes Relay
in the RLL program, you have to interlock
C100

the routines to make sure all the routines

SET

are executed. If you don’t use the interlocks, SP116 C100

then the CPU will only execute the first
LD
KF201
routine. This is because each port can only
handle one transaction at a time. LD
K0003
In the example to the right, after the RX
instruction is executed, C0 is set. When the LDA
port has finished the communication task, O40400
the second routine is executed and C0 is
reset. WX
VY0

C100
RST

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