Siemens SIMATIC S7-1200 System Manual page 1178

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Communication processor and Modbus TCP

13.5 Modbus communication

Table 13- 60 MB_CLIENT protocol errors

Response code to Modbus

client (B#16#)

Table 13- 61 MB_CLIENT execution condition codes

MB_CLIENT parameter errors

MB_CLIENT is waiting for a Modbus server response to a connect or disconnect request, on the assigned

TCP port. This code is only returned for the first execution of a connect or disconnect operation.

MB_CLIENT is waiting for a Modbus server response to a connect or disconnect request, for the assigned

TCP port. This will be returned for any subsequent executions, while waiting for completion of a connect

or disconnect operation.

A disconnect operation has successfully completed (Only valid for one PLC scan).

The server has not responded in the assigned time. MB_CLIENT must receive a response using the

transaction ID that was originally transmitted within the assigned time or this error is returned. Check the

connection to the Modbus server device.

This error is only returned after retries (if applicable) have been attempted.

Invalid mode

Invalid data address

Invalid data length

Invalid pointer to the DATA_PTR area. This can be the combination of MB_DATA_ADDRESS +

MB_DATA_LEN.

Pointer DATA_PTR points to an non-optimized DB area (must be a non-optimized DB area or M memory

The port is busy processing an existing Modbus request.

Received Modbus frame is incorrect or too few bytes have been received.

The assigned Connection ID parameter is different from the ID used for previous requests. There can only

be a single Connection ID used within each MB_CLIENT instance DB.

This code is also returned as an internal error if the Modbus TCP protocol ID received from a server is not

A Modbus server returned a quantity of data that is different than what was requested. This code applies

to Modbus functions 15 or 16 only.

In addition to the MB_CLIENT errors listed above, errors can be returned from the underlying T block communication

instructions (TCON, TDISCON, TSEND, and TRCV).

Modbus protocol errors

Function code not supported

Data length error

Data address error or access outside the bounds of the MB_HOLD_REG

address area

Data value error

Data diagnostic code not supported (function code 08)

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Siemens SIMATIC S7-1200 System Manual page 1178

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