Example for CheckRangeSigned

The assignment of a value to a DINT variable of a signed subrange type is a condition for automatically calling the ‎CheckRangeSigned‎. The function restricts the assignment value to the subrange as defined in the variables declaration. The default implementation of the function in ST is as follows:

Declaration part:

// Automatisch erzeugter Code : NICHT EDITIEREN
FUNCTION CheckRangeSigned : DINT
VAR_INPUT
        value, lower, upper: DINT;
END_VAR

Implementation:

// Automatisch erzeugter Code : Es handelt sich hierbei um einen Implementierungsvorschlag.
IF (value < lower) THEN
        CheckRangeSigned := lower;
        ELSEIF(value > upper) THEN
        CheckRangeSigned := upper;
ELSE
        CheckRangeSigned := value;
END_VAR