Preparation :
Once connected in the OPC IoT interface, for a typical OPC DA extraction, you need to use :
- One timestamp node,
- One OPC DA node,
- One debug node,
- One b3csv node.

Optional : you can use mapping node if you want rename OPC tags.
Timestamp node :
To access to the configuration part of each node, you need to double-click on this node.
You will see this screen :

For this part, you just need to change Repeat part : here, it set at a one-minute extraction (standard Braincube for process data).
Option Inject one after X second, then permits to execute each time you save your modifications (by clicking one Deploy button).
DA node :
Open the configuration part of this connector (double-click on the node) :

First, you need to create a new OPC DA connection (new endpoint) by clicking on the little pencil at the right of Add new opc endpoint.
You will see this tab :

On the right of your screen, you have the node help of the concerning node and part, OPC DA connection in this case :

When this Connection tab is filled, switch to the Variable tab.