Add and configure an OPC DA group

An OPC DA Group is an item that you add to an OPC DA data source in the Project Explorer. It represents a collection of variables or data points on an OPC DA server. A group monitors multiple variables as a collective, where the variables share common data acquisition characteristics.

Instead of polling the OPC DA server, a group forms the basis of a subscription to the server. When data changes in one or more of the variables on the OPC DA server, the OPC DA server sends an event notification to the server.

You can configure the properties of a group to reduce the rate and density of event notifications that the server manages. Also, you can update the values of a group by refreshing the group.

Prerequisite

Before you can add an OPC DA group, add and configure an OPC DA data source.

To add an OPC DA group

Note: You can add multiple groups to a data source.

1. In the Project Explorer, right-click the data source, and then click Add Group. An OpcDaGroup item appears.

   

2. Rename the item with a meaningful name.

3. Configure the properties. For guidance in configuring the properties, see OPC DA connector group properties.

Related topics

• Add and configure an OPC DA data source

• Use the Project Explorer

• Add and configure an OPC DA data connection

• Add and configure an OPC DA variable