- The trick to solve the issue when the trend display intermittently stops is to add two new registry tags and set them to specific values. According to AVEVA, these actions will help mitigate this issue.
- In the Historian Platform, log in Windows as an AVEVA user admin.
- Open the registry and create a backup of all the registries before doing any changes (the backup file can be several MB in size). Create these two DWORD registry tags in the HKEY_LOCAL_MACHINE\Software\ArchestrA\Historian\Programs\aahStorage:
MaxBlockCountForOptimisticStartEndBoundSearch : Set to 3 (decimal)
UseFileCacheForRetrieval : Set to 0 (decimal)
- Shutdown and Disable Historian.
- Enable (allow to run) Historian so that the registry changes can take place.
- Trend a System Time Tag, such as current seconds, to ensure the trend is running correctly.
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