You may inspect, and optionally change, values found in any variable associated with your drawing. Simple function blocks like a logic gate will have just one variable, namely the output state of the gate. More complex function blocks may have multiple variables. To inspect the variables, simply click on the function block. To change the value, click on the value in the data dialog, and edit. Be aware that program execution may promptly overwrite any value you set. Whether your change "sticks" will depend on when you make the change. If single stepping, and you change the output state of a logic gate for example, that change will stay in effect until the next time the gate function block is re-executed.
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