Control through the embedded fieldbus interface 355
Modbus exception codes
Table below shows the Modbus exception codes supported by the embedded
fieldbus interface.
Code Name Description
0x01 ILLEGAL FUNCTION The function code received in the query is not an
allowable action for the server.
0x02 ILLEGAL DATA
ADDRESS
The data address received in the query is not an
allowable address for the server.
0x03 ILLEGAL DATA VALUE A value contained in the query in not an allowable
value for the server.
0x04 SLAVE DEVICE
FAILURE
An unrecoverable error occurred while the server was
attempting to perform the requested action.
0x06 SLAVE DEVICE BUSY The server is engaged in processing a long-duration
program command.
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