Value
A read-write connection. Assign a tag to this connection. When the operator presses the button, the application writes the value for this button to the tag’s data source. The application also reads this tag to determine which state to display.
Assign the same tag to the Value connection for each Interlocked push button in the group.
Create Interlocked push buttons
Configure the Interlocked push button (General tab)
Set up states for the Interlocked push button (States tab)
How the Interlocked push button works at run time
Columns on the Connections tab of a graphic object's Properties dialog box