OPC AE: add history recovery feature
There is a stronger market demand to have more alarm data in PI so that the alarms can be analysed together with the process data. Existing (as of Oct 2019) PI OPC AE Interface does not support history recovery. Without the history recovery feature (automatic or manual), the interface is less reliable in terms of data loss possibility, especially in highly regulated industries such as Pharmaceuticals. On the control system side, OPC Historical Alarm and Events data access (OPC H A&E) is already available, for example for Siemens PCS7 with their product OpenPCS7. Requesting OSIsoft to look into adding this feature or produce another version that supports it.