Time period for which data is missing it is showing tag value as "Not connected" and "Comm fail". Please have suggestion on this.
Sounds like you have a data collection issue and you will have to back fill the data in some manner. Without knowing any details it is really hard to suggest any actions you should take.
Is there any way to backfill the data because data is not buffer on any server. We received tag value as "Comm Fail" and "Not connected" . This indicates that opc server written data as "Comm Fail" and "Not connected and there may be problem between opc server and PLC ?
You can backfill if you have a process to extra the data from the source system. Also, do you have an OPC HDA server?
Retrieving data ...