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15 RAS FUNCTIONS
15.4 Event History Function
Event history setting
Under normal circumstances, the event history function can be used with its default settings and need not be manually
configured. The storage memory and size settings for event history files can be changed as needed. ( Page 213 Event
history file)
[CPU Parameter] [RAS Setting] [Event History Setting]
For use in any of the following environments, use of an SD memory card for the save destination memory is
recommended because the number of events that occur becomes large.
• When file data write operations are performed frequently
• When the communication status changes frequently
• When device data write operations are periodically performed from a programmable controller of another
station or from another CPU module
The number of writes to the data memory is limited to 100000 times. In any of the above cases, when data
memory is used for the save destination memory, be careful about the number of writes to data memory.
Item Description Setting range Default
Save Destination Specify the storage location of event history files. ( Page 213 Storage
memory)
• Data Memory
• Memory Card
Data Memory
Set Save Volume of Per File Specify the storage capacity per event history file. ( Page 213 File size) 1 to 2048K bytes (in 1K bytes) 128K Byte
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