3 Communications Protocols
3.2.4 OMRON Protocol
3-10
3.2.4 OMRON Protocol
The OMRON protocol is used for communications between SYSMAC Programmable Logic
Controllers (PLCs) manufactured by OMRON. There is no need to be aware of the commu-
nications protocol.
Communications Using the OMRON Protocol
The OMRON protocol is used for communications between a Controller and an OMRON
PLC.
That is to say, the Master (Controller) transmits an OMRON format command to the Slave
(SYSMAC PLC), and receives a response message from the Slave.
When communicating with a SYSMAC PLC, the protocol is automatically converted inside
the 217IF Module. Therefore, the MSG-SND and MSG-RCV system functions can be used
in the same way as when the Extended MEMOBUS protocol is used by a user program.
Fig. 3.4 OMRON Format Message Flow
Between a Controller and OMRON PLC
CPU
MP900-Series Machine Controller
(Master)
OMRON format
MSG-SND
217IF
RS-232C
SYSMAC PLC (Slave)
MSG-RCV
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