6
FUNCTIONS
6.18 Error History
6.18.2 High Performance model QCPU, Process CPU, Redundant CPU
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1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication with
Intelligent Function
Module
8
Parameters
6.18.2 High Performance model QCPU, Process CPU, Redundant CPU
(1) Storage Area
The latest 16 errors are stored in the latched CPU module error history storage
memory.
When storing more than 17, the history can be stored in the memory card file using
PLC RAS setting in the "(PLC) Parameter" box.
(2) Stored data
When the history count set in the parameter and that stored in the memory card are
different after the following operation is performed, the contents of the memory card
history file is cleared, then the 16 error data in the CPU module error history storage
memory is trandferred to the history file.
• When the history count in the parameter history file is changed in the middle of
operation.
• When a memory card, which has a different history count from that set in the
parameter, is mounted.
The storage area in the error history file is as follows:
* 1 : When the number of storable files is exceeded, the oldest data is overwritten by the latest one.
POINT
Even if the failure history file set in the parameter does not exist in the memory
card, the error will not occur in the CPU module.
In this case, the CPU module stores the latest error into only the error history
storage memory of the CPU module.
(3) Error history clearing method
To clear the error history storage memory/error history file, choose [Diagnostics]
[PLC diagnostics] on GX Developer and click the button.
Data stored in both the CPU module error history storage memory and error history
file within the memory card can be cleared with a error history clear.
Table6.30 Error history file storage area
Storage area File in the set memory card
Amount that can be stored
Max. 100 (can be changed) *1
Clear log
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