8-8
Chapter 8. Modbus Communication Function
Other specifications
If there is an error in a response message, one of the exception codes shown below
is added after the function code.
Error type Exception code Description
ASCII RTU
Illegal function code 01 (2 bytes) 01H (1 byte) Function code not supported
by this device
The value is outside the
specified range from −32767 to
+32768.
Illegal data address 02 (2 bytes) 02H (1 byte) An included data address
cannot be read or written.
Device failure 04 (2 bytes) 04H (1 byte) Any of the following alarms has
occurred:
· AL74: Nonvolatile memory
error
· AL80: Nonvolatile memory
not initialized
· AL81: Setting value area error
· AL82: Adjustment value area
error
· AL83: Internal system error
· AL84: Setting value
initialization error
· AL95: Setting value error
· AL96: Adjustment value error
Illegal data 03 (2 bytes) 03H (1 byte) Error other than the above
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