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Modbus-RTU Slave Function for Replacing Existing PLCs Section 9-6
Unit Ver. 1.2 or Later
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.
• 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 Name
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
Command Name
MS PROCESSOR STATUS READ
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