Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 88

Basic Operating Procedure
Modbus-RTU Slave Mode
Modbus-RTU commands are sent from the host computer to the PLC.
Programming to
send commands and
receive responses.
Host computer
Serial Communications Board/Unit
Command
The host computer must be programmed to send the Modbus-RTU com-
mands and receive responses.
Section 1-9
59