Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 329

Modbus-RTU Slave Function for Replacing Existing PLCs
Unit Ver. 1.2 or Later
300
When Serial Communications Units/Boards with Unit Ver. 1.2 or later are
used, however, the Board/Unit's Modbus-RTU Slave specifications can be
switched according to the CPU Unit or other Unit in which the host computer
program is to be reused.
The Modbus-RTU Slave specifications change according to the Modbus-RTU
Slave compatible device mode that is selected.
• When the following commands for reading I/O memory (RR, RL, RH, RC,
RD, RJ, and RG) are received, the number of data words in each
response frame that is returned to the host is different.
Command
RR CIO AREA READ
RL LINK AREA READ
RH HR AREA READ
RC PV READ
RD DM AREA READ
RJ AR AREA READ
RG T/C STATUS READ
• When the command for reading the status of the CPU Unit (MS) is
received, the response format that is returned to the host according to the
FAL/FALS instruction execution status is different.
Command
MS PROCESSOR STATUS READ
Name
Name
Section 9-6