AC800M Modbus TCP comm with Siemens S7-400 not working

I have set up a communication between AC800M (master) and Siemens S7-400 PLC.

The MBTCPConnect Valid = true.

Parameters of CI867 are:

Modbus slave enabled = false (is this correct, the CI867 is master to the modbus slaves on the modbus tcp network)

Default gateway = (nothing filled in)

I use one MBTCPRead with 5 dint values and use start address %IW10#1000.

I assume this should return me the values of Input registers 1000 - 1004?

Is this correct?

The MBTCPRead Status = 0, which means "pending". What does pending mean?

nlfrlem Rank: 2465

Asked 5 years ago

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Did you check previous topics like this one?

Use search function for "CI867" and probably you can find answer quicklier compare to waiting for response.

Radomir Pistek AKS expert

Rank: 28

Answered 5 years ago