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Solution 1
If possible, trigger the message box again. The message box will obtain a valid time stamp and can be acknowledged.
Solution 2
Follow these steps to trigger the message box manually:
1.Note the message number (number can be evaluated via comments dialog).
2.Open the server project on the engineering station.
3.In Tag Management create a binary tag in the internal tags.
4.In Alarm Logging editor search for the message number.
5.Replace Message tag of the message with binary tag.
6.Insert an I/O field in a picture and link it to the binary tag.
7.Perform a delta compile and delta download.
8.Trigger message by means of I/O field.
It will obtain a valid time stamp and can be acknowledged.
Note
If operating at the server is not possible, link the variable with a server prefix to the I/O field. The box can now be operated from the client.
Solution 3
Emergency acknowledgement:
Follow the steps described in ‘How to perform an emergency acknowledgement’ in the WinCC Information System or in manual "WinCC V7.4: Working with WinCC" > Setting up a message system > Display of messages during runtime > Operation during runtime > How to perform an Emergency acknowledgement.
Solution 4
Find attachment
Solution 5
FAQ for PCS 7 V9.0:
https://support.industry.siemens.com/cs/ww/en/view/109751476
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