Omron CJ1W-PNT21 Operation Manual page 142

Troubleshooting the Network
Error History
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When the type of Alarm is Other then additional information can be found in
the Description and the Manufacturer Specific Data (Raw) fields.
The additional information can be copied to the Clipboard for further analysis.
When selecting an IO Device either in the New Alarms & data Exchange
Active Flags or the Selected IO Device area will show the last known alarm of
the IO Device. It does not necessarily mean that the alarm is still active. If a IO
Device has an active alarm that this will be displayed in the colour of the IO
Device (Yellow).
Alarms can be acknowledged with the Clear new Alarm Flags button.
The Error History item is reading the Error Log in the IO Controller. The IO
Controller stores up to 30 errors in its Error Log. Information on the errors
logged can be found in the list of errors.
Below the Error Log View is displayed.
Figure 8.4: Error history
Section 8-3