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CHAPTER6 FUNCTIONS
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6.18 Error History
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6.18 Error History
This function stores an error detected by the self-diagnostic function and the detection time as an error history in a
memory.
Select [Diagnostics] [PLC diagnostics] of GX Developer to check the history.
The detection time is based on the clock in the CPU module. Make sure to set the correct time before the first use of the
CPU module. ( Section 6.5)
(1) Storage area
All stored logs are saved to the storage memory for error history of the CPU module.
*1: The memory is managed inside the system.
*2: When the number of storable logs are exceeded, the latest error log is stored by deletion of the oldest error log.
(2) 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.
Table6.30 Storage area for error history file
Storage area Number of storable logs
System memory in CPU module
*1
Up to 100
*2
Clear log