Function code
Exception code
Error check (CRC-16)
If an error (except for a communications error) is found in the query content, the inverter will return
an exception response without performing any operation.
For the cause of an error, check the function code for the response. The function code for an ex-
ception response is the sum of the function code for the query and 80 hex (where the MSB is 1).
For the cause of an error, check the exception code.
Exception code
Code Description
01 hex An unsupported function is specified.
02 hex The specified address does not exist.
03 hex Data to write is out of the allowable range for writing.
07 hex
• The inverter does not allow this function.
• During operation, function attempts to write while write disallowed or a function that can-
not be written during operation.
• Function attempts to write to a write prohibited parameter during undervoltage. (Other
than all S group parameters, E52, H99, H198, H199)
8-4-5
No Response
The inverter will ignore the query and return no response if:
• It receives a broadcast (query with the address set to 0).
• It detects a communications error in receiving a query.
• The slave address specified in a query differs from the inverter’s slave address setting.
• The length of the time interval set for the inverter to receive the next data of the message after
receiving a message is less than 3.5 characters.
• The data length of a query is inappropriate.
• The length of the reception interval in a frame exceeds 1.5 characters.
• The error check code specified in a query does not match (CRC error).
• It receives a simultaneous broadcast by group (query with the address set to 250 to 254).
• It detects a parity error.
• Provide a timer on the master side for monitoring the response and set it to resend the same query
if no response is received within the set time.
8 Communications Functions
8-10
M1 Series Standard Type User's Manual (I669)
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