Omron CJ Series User Manual

7-23
7 Troubleshooting and Maintenance
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
7-5 Error Log Functions
7
7-5-1 Overview of the Error Log
7-5 Error Log Functions
Errors detected by the PROFIBUS Master Unit are stored in the error log along with the date and time
of their occurrence. You can monitor the error log by using the CX-ConfiguratorFDT.
Refer to sections 3-1-8 Error Logging and FDT Monitoring and 5-7-3 Using the Error Log for error log
monitoring operations.
The PROFIBUS Master Unit maintains an Error Log, which contains the reports on specific error
events.
 Logged Errors
The following errors are recorded in the error log.
• Errors in network operation
• Errors in data transfers
• Error in the CPU Unit
 Error Log Records
Each error is recorded as one record in an error log table. Each record contains:
• A main error code (see 7-5-2 Error Codes and Detailed Codes)
• A detailed error code (see 7-5-2 Error Codes and Detailed Codes)
• A time stamp (from the clock in the CPU Unit)
 Error Log Location
When an error is detected, the error codes and time stamp are recorded in an error log record,
which is stored in the error login volatile memory (i.e. RAM memory) inside the PROFIBUS Master
Unit. Serious errors are also recorded in non-volatile memory (i.e. Flash ROM).
A total of 80 error records can be logged in volatile memory.
Up to 16 more serious system errors are also copied to non-volatile memory.
 Adding Error Records to the Error Log
When adding a new record to the error log and the error log is full the latest error will replace the old-
est error in the log. At power up/reset the non-volatile error log will first be copied to the volatile error
log.
The contents of the non-volatile error log will be corrupted if the Unit is interrupted (i.e. power-
down/reset), while writing to the error log.
If an error in the non-volatile error log is detected at power up/reset, the Unit:
• Will try to repair the contents of the error log.
• If the log remains corrupted, the Error Log Storage Error bit in the Unit Status Word (*_LogStorErr)
will be set. In this case the error and the flag can only be cleared through the command ERROR
LOG CLEAR (see 6-3-4 ERROR LOG CLEAR (2103)). The start-up procedure will be completed
normally.
If, during normal operation, writing errors to the error log fails, the Unit will set the Error Log Storage
Error bit in the Unit Status Word (*_LogStorErr).
7-5-1 Overview of the Error Log

Omron CJ Series Specifications

General

Brand	Omron
Model	CJ Series
Category	Controller
Language	English