Automatic history recovery

Besides on-demand history recovery, the AVEVA Events to CONNECT also supports automatic history recovery.

For automatic history recovery, the agent tracks changes to the DeviceStatus of each component. When the DeviceStatus changes to DeviceInError or Shutdown, the agent starts a new history recovery interval. When the issue resolves or if the agent is restarted and the DeviceStatus changes to Good, the agent closes any current intervals for that component. The agent tracks these intervals for each component and, when DeviceStatus has a value of Good, it performs history recovery for these intervals starting from oldest to newest. For more information, see also Device status.

Note: If the data collection mode is set to CurrentWithBackfill, the agent clears periods not recovered for the component and stops keeping track of them. Only if the data collection mode is set to HistoryOnly, an automatic history recovery operation in progress will be canceled, otherwise it will be finished.

History recovery intervals

Automatic history intervals cannot be longer than four days. If an interval is longer than four days, the agent automatically changes the start time of the interval to be no earlier than four days before the end time prior to starting a recovery. If a current outage lasts longer than four days, when the device status finally improves the agent recovers up to four days before the current time.