Mitsubishi Electric MELSEC iQ-R Series User Manual page 228

Event history
The event history function displays the event information, such as errors occurred in each module, performed operations, and
errors on the network.
Information collected before turning the power OFF or resetting this product can be saved; therefore, this function can be
used to identify the error cause from the past operations and error occurrence trends. The displayed information can be saved
in the CSV file format as well.
[Diagnostics]  [System Monitor]  [Event History]
For details on the function or information collected with the event history function, refer to the following:
Page 215 EVENT HISTORY FUNCTION
• For checking error occurrence status for all modules, and clarifying the causes of malfunction which
occurred on the facilities/equipment
• For checking when and from where a parameter of a user program has been changed
• For checking if any unauthorized access from a third party has been tried
32 TROUBLESHOOTING
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32.3 Checking Errors in CW Configurator