1, WinCC archive data service is not started or stopped. At this point, you need to check whether the WinCC archiving service has been started and works normally.
2. The storage path of archived data is set incorrectly. At this point, it is necessary to check whether the storage path of archived data exists and is set correctly.
3. The archived data is damaged or lost. If the data is damaged or lost, it cannot be read from the memory. At this point, you can check whether the backup of WinCC archive data was successfully created and try to recover the data from the backup.