Omron M1 Series User Manual page 670

8 Communications Functions
No.
9 CRC-16 (LSB)
*1. Broadcasting cannot be performed.
If the Read/Write from/to Multiple Holding Registers function is not executed normally, refer to
8-5-9 Exception Response on page 8-20.
8-5-9
Exception Response
In a query, the master requests a response, except for broadcast or simultaneous broadcast by group.
Although the inverter normally returns a response to the query, it returns an exception response if the
query has an error.
An exception response has the field configuration shown in the table below.
Field configuration
Slave address
Function code
Exception code
Error check
The details of the field configuration are as shown below. An exception response has a function code,
which is the sum of the function code value of the query and 80 hex. An exception code shows the
cause of the exception response.
Function code
Query Exception response
01 hex
03 hex
05 hex
06 hex
0F hex
10 hex
17 hex
The MSB is 1.
Exception code
01 hex
02 hex
03 hex
07 hex
8-20
Field name Example (hex)
81 hex
83 hex
85 hex
86 hex
8F hex
90 hex
97 hex
An unsupported function is specified.
The specified address does not exist.
Data to write is out of the allowable range for writing.
•
The inverter does not allow this function.
•
During operation, function attempts to write while write disallowed or a parameter that
cannot 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)
Remarks
71
Description
M1 Series Standard Type User's Manual (I669)