The "state" of a Set pulse changes once in a cycle. So the signal goes from F to T in one cylce and from T to F in the next, like the name sais "pulse". I guess you are changing a boolean with your Set pulse. The ServiceTool needs a checkpoint to be able to "read" the state of that value (boolean). I don't think there is a way to change the background depending on a value. But you could try it with diffrend color panels. Make a green one visible (not hidden) if T, and a red one visible (not hidden) if F.
