6
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106
6.18.2High Performance model QCPU, Process CPU, and Redundant CPU
(1) Storage area
16 latest error logs are stored in the latched error history storage memory of the CPU module.
When more than 16 error logs are stored, the logs can be stored in a file in a memory card by the setting in the
PLC RAS tab of the PLC parameter dialog box.
*1: When the number of storable logs are exceeded, the latest error log is stored by deletion of the oldest error log.
(2) Storage data
Clear the history file in a memory card and transfer the 16 logs in the error history storage memory of the CPU
module to the history file when:
• The number of logs in the parameter history file is changed during operation or
• The number of logs in mounted memory card differs from the ones set in the parameter.
Even if a memory card does not contain an error history file set in the parameter, the CPU module will not cause an error.
In this case, the CPU module stores the latest error in the error history storage memory of the CPU module only.
(3) How to clear error history
To clear the storage memory for error history and error history file, select [Diagnostics]
[PLC diagnostics] in
GX Developer and click the
button.
This method clears all data stored in the storage memory for error history of the CPU module and error history file
in a memory card.
Table6.28 Storage area for error history file
Storage area
Number of storable logs
Built-in memory and a file in set memory card
Up to 100 (can be changed.)
*1
Clear log
