Code:
Feedback  VAR WORD
Reference VAR WORD

DeadBand  CON 2         ' +/-, set to 0 if no deadband is needed.

Main:
    ADCIN 0, Feedback       ' Get feedback voltage from Channel 0
    ADCIN 1, Reference      ' Get reference voltage from Channel 1

    ' Now compare the feedback voltage to the reference voltage and include the deadband.

    IF Feedback > (Reference + Deadband) THEN   ' Feedback is higher than reference
        ' Do whatever is needed here.
    ENDIF

    If Feedback < (Reference - Deadband) THEN    ' Feedback is lower than reference
      ' Do whatever is needed here.
    ENDIF
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