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From the following menu of GX Works3: [Diagnostics]→[Module Diagnostics(CPU Diagsnostic)] the event history function can be found.

The event history can display the error information of the CPU module, expansion board, expansion adapter, and network.
Also, the displayed information can be saved as CSV file format.

– Supported for CPU module’s firmware version Ver. 1.040 or above and GX Works3 version Ver.1.030G or above.
– The function to save the event history file to the SD card is supported for the CPU module with the manufacturer’s serial number 16Y**** and later.