Exception Response (Exception Code)
When the slave CLICK PLUS PLC receives a request from the Modbus master that it cannot
respond to, the slave CLICK PLUS PLC sends an exception response to the Modbus master.
The CLICK PLUS PLC supports the following Exception Responses.
Exception Response (Exception Code)
Code
Name
Details of Exception Response
01
Illegal Function
The CLICK PLUS PLC does not support the function code received from the
MODBUS master.
02
Illegal Data Address
The MODBUS master tried to access to an invalid address.
03
Illegal Data Value
The data length is zero or exceeds the maximum size.
The data for Write Single Coil is not FF00h (ON) or 0000h (OFF).
The PLC mode change request from the MODBUS master is not valid.
04
Slave Device Failure
Password is locked.
When the PLC mode switch is in STOP position, the MODBUS master
requested to switch to RUN mode.
When the PLC mode switch is in RUN position, the MODBUS master requested
to switch to the Firmware Update mode.
CLICK PLUS PLC Hardware User Manual, 1st Edition, Rev. B – C2-USER-M
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Chapter 4: PLC Communications
