cqm1 slave ،hmi delta master

[alikargar]

Hello, I know little English, I want to use 4 plc cqm1 as slave (modbus), and hmi delta as master. Unfortunately, I cannot establish rs485 communication.
is it possible???
Meanwhile, I use the rs232 to rs485 converter (delta ifd8520).

 

[parky]

perhaps read this thread not much in it but there is a mention of macros for modbus

https://www.plctalk.net/qanda/showthread.php?t=42942
Here is another one

https://www.plctalk.net/qanda/showthread.php?t=17258

And yet another one
https://control.com/forums/threads/use-modbus-protocol-for-omron-cqm1-cpu11.13931/
Also probably more useful is this one scroll down & there seems to be some files & programs to do what you need to do
https://www.myomron.com/index.php?action=kb&article=1243

 

[IO_Rack]

CQM1 and CQM1H are much different PLCs despite the similarities in part numbers.

I don't believe the CQM1 is capable of RS485 or ModBus.

For the CQM1H, you can get the CQM1H-SCB41 communication board the follow instructions in Parky's links.

 

[parky]

If you can send ascii chars then it is possible The PMCR (I think it's called) is common to all processors, however, I think the OP will have to write the code to populate the message including the CRC. I'm sure the one I did was not the H version, we did not use 485, however, a simple 232/485 converter should work.