Mitsubishi Electric MELSEC iQ-R Series User Manual page 61

Event history
The Event History function displays the event information including error occurred on each module, performed operations,
and error on the network. Since the information collected before turning the power OFF or resetting can be saved, it is used to
identify the cause of abnormalities from past operations or error occurrence tendency. The displayed information can be
saved in CSV file format.
[Diagnostics]  [System Monitor]  [Event History]
Use the event history function in the following cases.
• 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
For more details on the function or information collected with the event history function, refer to the following manual.
MELSEC iQ-R C Controller Module User's Manual (Application)
6 PROCEDURE BEFORE OPERATION
6.14 Troubleshooting
6
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