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Excep-
tion Code
Name Description
01 Illegal Function Code The "Function Code" is unknown to the
server.
02 Illegal Data Address Depends on the Modbus request
03 Illegal Data Value Depends on the Modbus request
04 Server Failure The server was unable to properly termi-
nate processing.
05 Acknowledge The server has accepted the Modbus
request. However, the execution takes a
relatively long time. The server therefore
only returns an acknowledgement con-
firming receipt of the service request.
06 Server Busy The server was unable to accept the
Modbus request. It is the responsibility of
the application on the client to determine
whether and when to re-send the request.
0A Gateway Problem The gateway path is unavailable.
0B Gateway Problem The targeted device does not respond.
The gateway generates this error.
LXM32M
7 Diagnostics and troubleshooting
Modbus-TCP module
73
0198441113843, V1.01, 01.2012