Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Modbus-RTU Slave Function for Replacing Existing PLCs Section 9-6
Relationship with 1:N/1:1 Protocol Settings
The 1:N/1:1 Modbus-RTU Slave protocol setting depends on the compatible
device mode, as follows:
• Mode A (CS/CJ/C), mode B (CVM1/CV): 1:N Modbus-RTU Slaves only
• Mode C (C200H), mode D (C500/120): Either 1:N or 1:1 Modbus-RTU
Slaves
Allocated DM Area Settings (Setup Area)
m = 100
×
unit number
Setting Examples when Replacing PLCs
A host computer program that has been created using a C500-LK101/201/
103/203 Modbus-RTU Slave Unit can be reused in a Serial Communications
Board/Unit with Unit Ver. 1.2 or later by making the following settings to enable
the 1:1 Modbus-RTU Slave protocol.
• 1:N/1:1 Modbus-RTU Slave protocol setting: 1 (ON = 1:1 Modbus-RTU
Slave)
• Modbus-RTU Slave compatible device mode setting: 3 hex (mode C
(C500/120))
Words Bit Setting contents
Board Unit
Port 1 Port 2 Port 1 Port 2
D32003 D32013 m+3 m+13 14 1:N/1:1 protocol setting (Unit Ver. 1.2 or later only)
1: 1:1 protocol; 0: 1:N protocol
If the Modbus-RTU Slave compatible device mode is
set between 0 and 2 hex (mode A or B), the setting in
this bit is invalid (always 1:N Modbus-RTU Slaves)
D32003 D32013 m+3 m+13 08 to 10 Modbus-RTU Slave compatible device mode
0 hex: Default (mode A)
1 hex: Mode A (CS/CJ/C)
2 hex: Mode B (CVM1/CV)
3 hex: Mode C (C200H)
4 hex: Mode D (C500/120)