OPC DA

The OPC DA protocol adapter can connect to OPC Classic DA 3.0 servers.

Important:
  • The OPC DA protocol adapter does not support remote connections. The OPC DA server must be installed on the OT Connect Process Data server, running under the same user account as the Adapter service.
  • Only OPC 3.0 servers are supported by OT Connect.

Vendors of the Process Historian software may have been implemented different elements of the specification. Therefore, it is important to review the Connection Status or OT Source Capability Utility report to understand the Capabilities available from the server that you want to integrate with GE Digital APM.

The most common limitation for OPC DA protocol adapter is properties, such as Description or RawUom not being available for Tag Sync. If these properties are not available, you will get only Tag Name and Data Type.

An OPC DA server can provide the following capabilities:
  • LastReading
  • SubscribeReadings

Protocol Connection

The OPC DA protocol adapter requires the ProgId to be configured.

If the correct ProgId is not provided, the protocol adapter will log an exception report on all available OPC DA ProgIds in the server on startup.