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