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MELSEC-F
TROUBLESHOOTING11
11 - 13
(5) Error log area (BFM#227 to 372)
This area stores the following errors.
• Errors whose source cannot be confirmed
• Errors that occurred during communications using the random access buffer
• Errors that occurred during communications using MC protocol
(a) Number of error occurrences (BFM#227)
1) This address stores the number of errors registered in the error log block
area.
2) When errors occur more than 65536 times, the count is stopped at
FFFF
H (65535).
(b) Error log write pointer (BFM#228)
1) This address stores the error log block number where the latest error
logging is registered.
0 : No error. (No registration of error log)
1 or more : Error log block number where the latest error logging is
registered
* If the pointer value is "16", it means that the latest error logging is
registered in the error log block 16 area.
2) When 17 or more errors occur, the registration of error logging starts from
error log block 1 area again.
(c) Error log block - Error code/end code (starting from BFM#229)
1) In the error code/end code area, error codes are stored that indicate error
content. (See Section 11.3.)
(d) Error block - Subheader (starting from BFM#230)
1) The subheader code of a faulty message is stored in bits 0 to 7 of the
corresponding area. ("0" is stored in bits 8 to 15).
2) For errors below the TCP and UDP levels, "0" is stored.
(e) Error log block - Command code (starting from BFM#231)
1) This block stores the command code of a errors message.
2) "0" is stored in the following case.
• For messages not containing a command code
• For errors below the TCP and UDP levels (because their commands
are unknown)
POINT
(1) An error log block area consists of sixteen error log blocks that have the same
data order.
(2) The error information continues to be stored into the following areas even if
the count of the error occurrences is stopped and no longer stored:
• Error log write pointer storage area
• Error log block
Command code
b15 b0
to