Appendix B. Modbus ProtocolVFD-ED
B-5 Exception Response
When the drive is using the communication connection, if an error occurs, the drive responds to the
error code and sets the highest bit (bit 7) of the command code to 1 (function code AND 80H) then responds
to the control system to signal that an error occurred.
If the keypad displays “CE-XX” as a warning message, “XX” is the error code at that time. Refer to
the table of error codes for communication error for reference.
Address
Function
Exception code
LRC Check
END
The explanation of exception codes:
Error code Explanation
Function code is not supported or unrecognized.
Address is not supported or unrecognized.
Data is not correct or unrecognized.
Failure to execute this function code
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