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First, you have to right click on application, then you navigate to add object and down to Symbol Configuration, as shown in the image. Make sure that you have "Support OPC UA features activated. Once you have added the Symbol Configuration you will get an option about which type of variables you want to "activate" (as shown in the picture), and visualize later on in Ignition. If there are no variables showing, make sure to press the "Build" button in the same window(Symbol Configuration). These variables are the variables that, for example, show that a button is TRUE or not. Before thinking about doing anything else, you should connect to a PLC.