Mitsubishi FX3U Series User Manual page 114

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
1. Exception codes supported by FX
The following table outlines the exception codes supported by the MODBUS slave device.
Exception
code
01H Illegal Function
02H Illegal device address
03H Illegal data value
04H Slave device failure
110
MODBUS Slave
3U
Exception name
The requested function (code) is unsupported by the slave
The requested device address or device address + device count
exceeds the supported range of this slave
One of the fields within the request exceeds the allowed value (e.g.
the implied length, the device count)
An unrecoverable error occurred while the slave was processing the
request
12 Troubleshooting
12.6 MODBUS Error Code List
Details