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9-25
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-4 Err
o
r L
ogs
9
9-4-1 Error Log
Data
9-4 Error Logs
The error log function records the errors detected in the Serial Communications Unit together with the
time that the error occurred.
You can read or clear the recorded results (error logs) by using CX-Integrator. For the operation to con-
firm the error log by using CX-Integrator, refer to the CX-Integrator Ver.2.
@ OPERATION MANUAL (Cat.
No. W464).
z
Error
Description of the error that occurred.
z
Detailed Information
Detailed information used in the troubleshooting of each error that occurred.
For the error descriptions and detailed information, refer to 9-4-2 Error Contents and Details.
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Time of Error
The time the error occurred is recorded including the year (rightmost two digits), month, day, hour,
minute and second.
Additional Information
The Serial Communications Unit uses the time information read from the CPU Unit.
If the time cannot be read from the CPU Unit, the time of the error in the error log will be
recorded as all zeros.
If the built-in clock time is not set correctly, the time recorded in the error log will be incorrect.
When the error log is read, the time will be irregular.
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RAM Error Log Data
For every error that occurs, one record is logged in the RAM error log table in the Unit for up to 64 errors.
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EEPROM Error Log Data
Records of errors that are particularly serious are logged in both the RAM error log table and the
EEPROM error log table in the Unit when they occur. The contents of errors logged in the EEPROM
error log table remain even if the power to the Unit is turned OFF or the Unit is restarted. The con-
tents of the EEPROM error log table are automatically read to the RAM error log table when the
Controller is reset. One record is logged in the EEPROM error log table for each error that occurs for
up to 32 errors max.
Once the stored data reaches the upper limit (64 records in the case of RAM or 32 records in the
case of EEPROM), the oldest record will be deleted every time a new record is stored.
9-4-1 Error Log Data
Structure of Error Log Data
Error Log Data Storage Location