Now we know, that Variable nodes in the OPC UA address space are the datasources, but to utilize them with the Connectware, how do we reference them? There are two choices:ġ) By NodeId, which is a node’s unique identifier. The Subscriptions pane then shows the actual value and it is updating at a fast rate. Proceed now with a right click on CurrentTime and select subscribe to data change. They allow us to read and write data, depending on their designated AccessLevel attribute. The Commissioning File, which we are about to create in the next step, will deal with Variable nodes. Select it and take a look at the Attributes pane – according to the NodeClass attribute we are dealing with a Variable here which implies, that there is a Value attribute as well. ![]() Go ahead and explore everything beneath Objects until you find the node displayed as CurrentTime.
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