11 - 27
11.4 Error Codes
11.4.1 Error code storage area
11
TROUBLESHOOTING
(c) Error log (Error logs 1 to 32)
The error log area stores 32 latest errors.
The errors are stored in the chronological order, starting from Error log 1.
If 33 or more errors have occurred, the old error logs are overwritten, starting from
Error log 1 area.
(9) Exception code storage area
When processing requested from the master is completed in error, an exception code
that was returned to the master is stored.( Section 11.4.2)
Table11.14 Contents of error log
Item
Function
Automatic
communication function
Dedicated instruction Slave function Others
Detailed error code
Stores an error code corresponding to the error that occurred at any timing, such as during processing of a
request from the master, at power-on or when changing a MODBUS device assignment parameter.(
Section 11.4.3)
Exception code
Stores the exception code that was returned from a
slave in reply to a request message sent by the
automatic communication function or dedicated
instruction. ( Section 11.4.2)
Stores the exception code
returned to the master
when an error occurs for a
request message from the
master. ( Section
11.4.2)
Stores "0".
Function code Stores the function code from which the error was originated. Stores "0".
CH
Stores the channel number (1/2) where the error occurred.
Stores "0" is if the channel is not identified.
Station No.
Stores the station No. of the target station when an error occurred.
Stores "0" is if the station No. is not identified.
Function
Stores the function in which the error occurred:
0:No error
1: Automatic communication function
2: Dedicated instruction
3: Slave function
4: Other
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