The OPC DA source service is a client that collects data from OPC servers. Data points in OPC are tags that represent data from devices and provide real-time access to data. When you configure the OPC DA source service, specify the details of the OPC server and list of tags.
The OPC DA source service creates a subscription client to monitor the list of tags that you provide. The source service converts the OPC data, including the tag name, value, timestamp and quality, to PIPE format.