Associated with: Wonderware Historian database item.
The Connection State attribute indicates the status of the network connection between HCAL and the Wonderware Historian server.
The possible connection states are:
- Disconnected—The Wonderware Historian 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 Wonderware Historian server. HCAL will not try to open the connection again.
- Failed - <Error Message>—An error occurred when HCAL tried to connect to the Wonderware Historian server. This might indicate that:
- The Wonderware 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 Wonderware Historian server. This is a transitory state.
- Connected to Server—HCAL has connected to the Wonderware Historian server.
- Connected to Storage—HCAL has connected to the Wonderware Historian server storage engine and is ready to accept data from ClearSCADA.
For information on resolving connection anomalies, see Troubleshooting Wonderware Historian Driver Operation.