Panasonic ELC500 User Manual page 175

Error code
01 Function code error (Non-existent function code)
02 Number error of coil, input relays or registers (out of range)
03 Quantity error of coil, input relays or registers (out of range)
●Error check: 16-bit data for detecting communication error (Refer to the next section.)
●Response in normal status:
The same message as a command is returned for single write command.
Meaning
167
ELC500 Control unit