OPC Studio User's Guide and Reference
Automatically Get an OPC Property (On Form Load)
The OPC-DA property value can also be obtained automatically when the form loads.
Note: In OPC-UA Unified Architecture, there is no need for this – just use Read.
How to configure this feature:
On a PointBinder, edit the BindingGroups collection, "Add" a new binding group, and set its AutoRead property to True.
On a TextBox, use "Bind to Point" command and select the OPC item and property you want to get. Then, use the "Edit Live Bindings" command, and set the BindingGroup property of the property binding to the binding group you have created earlier. The Get operation is automatically executed for all property bindings in this group when the form loads.