Hello Siemens Community,

I am trying to figure out how to communicate between 

•  S7-400 CPU 412-1
• Omron CJ2M34

hi Hubert, 

what Order-No. has the S7-412 exactly?

Are there any CP-modules used in the rack?

What interfaces does the Omron PLC have?

the more we know, the more we can help.

regards,

Hello,

maybe question if you can prepare also communication on Omron side, in this case think about user communication via Ethernet. Other system can be via Modbus TCP, but we don't know your CP card order number and then if Modbus can be implemented, probably other licences are needed to buy. wait for others recommendations.

Siemens order no. is 6ES7412-1XJ05-0AB0

I was thinking to use modbus TCP gateway for CJ2M like the one below, CJ2M it can only be configured as slave with this one.

http://www.support-omron.fr/pdf/CP1W_MODTCP61_manual_en_201111.pdf

then try to find a master modbus TCP card for S7 412-1