The bad signal quality function QTY_BAD evaluates the quality bits of the input signal and passes it as a Boolean signal for the application.
The IN input can be connected to any logic application signal (except preprocessing block). Due to application logic quality bit propagation, each (simple and even combined) signal has quality which can be evaluated.
The OUT output indicates quality bad of the input signal. Input signals that have any other than test bit set, will indicate quality bad status.