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Lost Trends after PLC Crash

Created by: henno2000 at: 10/29/2007 5:30 PM (4 Replies)

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10/29/2007 5:30 PM	Rate (0)
henno2000 Posts: 177 Rating: (0)	Hi, For some reason, our WinCC Project lost comms with the PLC, and now have lost all the trend data upto that time. (By trend data, I am referring to what can visually seen through the graphs displayed within WinCC). I am able to see all the archives etc, and have tried to link them via tag logging, but just get a message along the lines of that the database file is already linked. Could someone explain why the trends were lost and how to retrieve them? Regards, henno2000
henno2000 Posts: 177 Rating: (0)
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10/29/2007 8:03 PM	Rate (0)
DimiCamp Posts: 168 Rating: (49)	Hi. I think we could considerthat it maybe caused for another reason, I mean two faults for different reasons about the same time. It's dificult, but they can occur. Any way (guess the cause doesn't matter), have you tried to unlink the files and then link them again? If it doesn't help, try to unlink and cut them to another folder (temporarily). Activate your system again and check if everything goes right from that. If everything it's working fine with the new generated archive file, try to link the old ones. Best regards, Dimitri.
DimiCamp Posts: 168 Rating: (49)
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11/2/2007 9:39 AM	Rate (0)
henno2000 Posts: 177 Rating: (0)	Hi, I have tried disconnecting/reconnecting etc, but with no luck. I have also noticed that the trend window only displays approx the last 20 minutes of data. Everything else prior to that seems to be overwritten. The daily backups that I initialised are being created, which I have tried linking, but no joy. Also, when deactivating and reactivating the project, upon reactivating the project hangs on the tag logging runtime message for a significant amount of time. Is there anything else that can be done to view past trends etc? Regards, henno2000
henno2000 Posts: 177 Rating: (0)
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11/2/2007 3:07 PM	Rate (0)
ateam Bronze Member Joined: 12/8/2006 Last visit: 11/27/2023 Posts: 170 Rating: (26)	hi henno2000, (1) Did you changed the archive configuration of the tag or alarm logging. (I mean the properties for Tag Logging Fast/Slow or Message archive.) Maybe youhaveconfigured a wrong sizefora single segment and the sizeover all segments, so that the archived valuesare overwritten! (2) In the case of the connection error AND the wincc redundancyoption (may be) a segment change was forced, and the redundancy state was changed too!May be, the archive segments of the standby-server was copied into the folder "ArchiveManager". You can checkthis by using windows explorer. You will find the folder "ArchiveManager" in the project directory. The first information of the filename of each segment is the computername. ----------------------------------------------------------------- informations about the archive segments : ----------------------------------------------------------------- - How is a backup segment, which has been swapped out, connected to or disconnected from the archive manager? http://support.automation.siemens.com/WW/view/en/21954320 - What causes new segments to be created in the WinCC cyclic storages "AlarmArchive", "TagLoggingFast" and "TagLoggingSlow"? http://support.automation.siemens.com/WW/view/de/22273427 - Why does the name of exported backup files (archive segments) contain a time stamp which does not correspond to the local time of the data contained in the segment? http://support.automation.siemens.com/WW/view/de/23542699 - To check the content of the runtime database,I would prefer the online table control, becausethe online table control doesn't shows interpolated values. -If you have experiences in Microsoft SQL server, you canuse the Microsoft "SQL Server Management Studio" to display theruntime data of tag logging databases (segments) Note: In SQL Server Management Studio you can see if dataare storedin a spezified time interval. In SQL-Server you can't see the really value, because the logged value are compressed (binary data type). To access the real data you need the connectivity pack.
	Last edited by: ateam at: 02.11.2007 15:13
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11/2/2007 6:13 PM	Rate (0)
henno2000 Posts: 177 Rating: (0)	Sorted now, I have to close the project, exit WinCC, reset the achives via Tag Logging, restart WinCC and link the archives back. FYI, I check the Achive Manager and noticed that everything was backing up OK until the 31 Oct (Halloween). Spooky I have attached a screen shot to show you what was contained within that folder. Regards, henno2000 Attachment Archive.zip (108 Downloads)
henno2000 Posts: 177 Rating: (0)
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