Generate history

All active objects (AppEngine and hosted objects) report history data as they normally do in the run-time environment.

Historical data is reported to the historian only from the Active AppEngine.

Losing connectivity with the historian does not cause a failover. The Active AppEngine goes into store-forward mode and caches data every 30 seconds. Store-forward data is synchronized with the Standby AppEngine.

When failover conditions occur, no more than 30 seconds of history data is lost in the transition from Standby to Active status. For more information, see the AVEVA Software Global Customer Support website.