mobus communication between ABB PLC with CI853 and SIEMENS PLC with CP341
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I tried it and it si working good.
Please check many other issues like this in this forum - in search field write MODBUS.
COM port of CI853 is RJ45 socket, you need to use 3=TD, 6=RD, 4+5=0V
One very important you can check (it took me 2 days): set Poll time = 0 for modbus settings in CBM (see below):