206
Troubleshooting Tables
Section 9-3
Error Log Storage
Methods
The error log storage method is set in the Unit Setup Area in DM 6655, bits 00
to 03). Set any of the following methods.
1.
0 Hex: You can store the most recent 11 error log records and discard older
records. This is achieved by shifting the records as shown below so that
the oldest record (record 0) is lost whenever a new record is created.
2.
1 Hex: You can store only the first 11 error log records, and ignore any sub-
sequent errors beyond those 11.
Clearing the Error Log
To clear the entire error log, turn ON SR 25214 from a Programming Device in
PROGRAM mode or using an instruction. (After the error log has been
cleared, SR 25214 will turn OFF automatically.)
9-3
Troubleshooting Tables
There are basically two types of error that can occur for the Customizable
Counter Unit: Fatal errors, which stop operation, and non-fatal errors, which
do not. The ultimate cause of either of these errors could be in the Customiz-
able Counter Unit or in the CPU Unit.
When an error occurs, the Customizable Counter Unit will perform the follow-
ing.
• Indicate the error on the Unit indicators.
• Display an error message and error code on any Programming Device
that is connected.
• Store the Customizable Counter Unit error code in SR 23500 to SR 23507
and allocated word n+5 bits 00 to 07.
• Turn on the relevant error flags and SR Area bits (SR 23508 to SR
23511).
• Store an error record in the error log in DM 6144 to DM 6199, including
the Special I/O Unit error code, detailed information, and time.
The following tables provide the error information and corrective messages for
errors that can occur.
Error log record 10
Error log record 11
Error log record 1
Error log record 2
Oldest record lost
New record added
All records shifted
Error log record 10
Error log record 11
Error log record 1
Error log record 2
No changes after 11 records stored
Error occurs
Error ignored
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