Manual recovery can be performed from the Historian Administrator. Manual recalculate is done for filling the data gaps but not for filling old data.
It is advised to keep the Wondeware collector in the same time zone as the Wonderware server. If there is a mismatch, there is a possibility that auto recovery of data will be incomplete.
To initiate manual recovery:
Procedure
- In the Historian Administrator, select the Wonderware collector.
- Click Recalculate. The Recalulate dialog appears.
- Enter the start and end time and choose all or selected tags based on the criteria from Recalculate window.
- Click Recalculate.
Once manual recalculate starts, the collector recovers selected tags data from Wonderware server to GE Historian between start time and end time.
It is advised to choose small time intervals, so that the load on Wonderware server/collector will be reduced.
Note: At the time of recovery, if the connection to Wonderware Server is lost, and if the reconnect mechanism is enabled, the collector will try to connect to the server and pull the data once connection reestablishes.
Example:
Assume that the Collector connected to GE historian for the first time today and the archive was created at 10 am. The user initiates manual recalculation from 1am to 2am.
For that time interval, the archives were not even created. With respect to Historian it is old unknown data and the data write fails.
If there is a data gap between 1pm to 2 pm, manual recalculation successfully fills the data gap.