CM577 Modbus Communication
I am using cm577 module with pm 583 eth plc.CM 577 communicate with Emerson DP transmitter via Modbus TCP/IP. i make the program as per ABB documents using ETH_MOD_MAST function .i am using function code 4. i got done bit and no error, but i am not getting any value. Also i test with CM577 to Modbus poll and Transmitter to Modbus Poll its working fine with function code 4.
But CM577 To transmitter it’s not working.
What could be the reason and solution for it? Plz help.
Have you assigned CM577 module as Modbus server in control builder?
Is slot no. is correct in ETH_MOD_MAST block?
Try with function code 3 and take address 40000 as MW0.0
Check and verify your Modbus address mapping also.
Also try to check with only one varibale address instead of an array.
As Titus some time slave address needs to be 255 or 0 .
Hope it helps you.