All signals between two diagrams must be created and / or connected on either
end. An open signal is when a connection has be started from one diagram but
has not been completed on the other diagram.
Select Diagram then Open signals from the FUP editor menu.
The screen will display a selection box where you can specify criteria for the
diagrams (function plans) that contain open signals.
Enter the criteria to be matched exactly, or enter wildcard characters like "?" for
any single character or "*" for any number of characters.
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