Modbus Rtu Master Execution Error Codes - Siemens SIMATIC S7 System Manual

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Modbus RTU master execution error codes

The high numbered error codes (starting with 101) are errors that are returned by the

Modbus slave device. These errors indicate that the slave does not support the requested

function or that the requested address (either data type or range of addresses) is not

supported by the Modbus slave device.

The low numbered error codes (1 through 12) are errors that are detected by the

MBUS_MSG instruction. These error codes generally indicate a problem with the input

parameters of the MBUS_MSG instruction, or a problem receiving the response from the

slave. Parity and CRC errors indicate that there was a response but that the data was not

received correctly. This is usually caused by an electrical problem such as a bad connection

or electrical noise.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

Invalid parity type

Invalid baud rate

Invalid timeout

Invalid mode

Invalid port number

Signal board port 1 missing or not configured

9.3 Modbus RTU library

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