Associated with: AVEVA Historic Data Export items
The Connection State attribute indicates the status of the network connection between HCAL and the historian server.
The possible connection states are:
- Disconnected—The AVEVA Historic Data Export driver has not opened a network connection. For example, this could be because the database item is not 'in service' or there is a configuration error.
- Open Failed—HCAL has failed to open the connection to the historian server. HCAL will not try to open the connection again.
- Failed - <Error Message>—An error occurred when HCAL tried to connect to the historian server. This might indicate that:
- The historian server is offline
- There is a network issue
- A user may have entered an incorrect username or password
- A user may have entered an incorrect or invalid node name
- There has been a Domain Name System (DNS) failure.
- Pending—The connection status is not yet available from HCAL. This is a transitory state.
- Connecting—HCAL is still connecting to the historian server. This is a transitory state.
- Connected to Server—HCAL has connected to the historian server.
- Connected to Storage—HCAL has connected to the historian server storage engine and is ready to accept data from Geo SCADA Expert.
For information on resolving connection anomalies, see Troubleshooting Historic Data Export Operation.