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Categories Data Archive
Created by Guest
Created on Aug 20, 2022

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Change Flat Data to No Data if PI Interface to PI Server Connection is lost

Problem: iIf PI Interface disconnected from PI Server, PI Point will show flat data until connection up not No data or Disconnected Propose Solution: Pl Server have ability to change flat data to no data if PI interface disconnected from PI Server. It will make misunderstanding if PI Point show flat data. In example level point from ATG Sensor, flat data could be that level on standby, but reality connection to PI server is lost
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  • Guest
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    |     Aug 20, 2022
    Unfortunately we actually don't know when a disconnection has occurred. Just because there is no data flowing, it doesn't always mean there is a disconnection. There is no "marker" that tells us a disconnection has occurred. Even if there was a marker, the fact that the connection is disconnected mean that we wouldn't receive that marker. No Data is a System Digital State that has a special meaning, especially when the clients make a data access call to the server. We cannot place No Data into a data stream just because there has been no data, because as I described earlier, we don't actually know when a disconnection has occurred.