Mitsubishi Electric QJ71MB91 User Manual page 333

11
TROUBLESHOOTING
Item
communication function
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 that was returned from a
slave in reply to a request message sent by the
Exception code
automatic communication function or dedicated
instruction. (
Function code Stores the function code from which the error was originated.
Stores the channel number (1/2) where the error occurred.
CH
Stores "0" is if the channel is not identified.
Stores the station No. of the target station when an error occurred.
Station No.
Stores "0" is if the station No. is not identified.
Stores the function in which the error occurred:
0:No error
1: Automatic communication function
Function
2: Dedicated instruction
3: Slave function
4: Other
(9) Exception code storage area
(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
Automatic
Dedicated instruction
Section 11.4.2)
When processing requested from the master is completed in error, an exception code
that was returned to the master is stored.(
Function
Slave function
Stores the exception code
returned to the master
when an error occurs for a
request message from the
master. ( Section
11.4.2)
Section 11.4.2)
11.4 Error Codes
11.4.1 Error code storage area
Others
Stores "0".
Stores "0".
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