6
FUNCTIONS
6.18 Error History
6.18.2 High Performance model QCPU, Process CPU, Redundant CPU, Universal model QCPU
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6.18.2 High Performance model QCPU, Process CPU, Redundant CPU,
Universal model QCPU
The storage area depends on the CPU module.
(1) Storage Area
(a) High Performance model QCPU, Process CPU, Redundant CPU
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.
(b) Universal model QCPU
All storable data are saved into the error history storage memory of the CPU
module.
* 1 : When the number of storable files is exceeded, the oldest data is overwritten by the latest one.
(2) Storage data
When the number of histories set in the parameter and that stored in the memory card
are different after either of the following operations is performed, the history file in the
memory card is cleared, then the 16 points data in the CPU module error history
storage memory is transferred to the history file in the High Performance model
QCPU, Process CPU, or Redundant CPU.
• 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:
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.
Table6.36 Error history file storage area
Item
High Performance model QCPU, Process CPU, and
Redundant CPU
Universal model QCPU
Storage area
Built-in memory and the file in the set memory card
Built-in memory
Amount that can be stored
Max. 100 (can be changed)
*1
Max. 100
*1
Clear log
