FIX16Sub

This function subtracts two signed 16-bit fixed-point numbers. The numbers do not have to have the same resolution (number of decimal places). The resolution of the number with the higher number of decimal places is reduced before the subtraction, i.e. the decimal places of the number with the higher resolution are truncated. The result of the subtraction is a signed 16-bit fixed-point number.

FUNCTION FIX16Sub: T_FIX16

VAR_INPUT
    minuend    : T_FIX16;
    subtrahend : T_FIX16;
END_VAR

PROGRAM FIXSUB
VAR
    a, b   : T_FIX16;
    result : LREAL;
END_VAR

a := LREAL_TO_FIX16( 0.5, 8 );
b := LREAL_TO_FIX16( 0.75, 8 );

result := FIX16_TO_LREAL( FIX16Sub( a, b ) ); (* The result is: -0.25 *)