LREAL_TO_FIX16

FUNCTION LREAL_TO_FIX16 : T_FIX16

T_FIX16

VAR_INPUT

VAR_INPUT
    in : LREAL;
    n  : WORD(0..15) := 15;
END_VAR

in: The LREAL number to be converted.

n: Number of required decimal places.

Example:

In the following example several constants are converted to fixed-point numbers. The number of decimal places can be specified for the conversion. Please note that (similar to the conversion of floating-point numbers) rounding errors may occur (q2 and q15 in our example).

PROGRAM TEST
VAR
    q2, q4, q8, q12, q15 : T_FIX16;
    r2, r4, r8, r12, r15 : LREAL;
END_VAR

q2 := LREAL_TO_FIX16( 0.6, 2 );
q4 := LREAL_TO_FIX16( -0.25, 4 );
q8 := LREAL_TO_FIX16( -0.75, 8 );
q12 := LREAL_TO_FIX16( 2.30078125, 12 );
q15 := LREAL_TO_FIX16( 0.6, 15 );

r2 := FIX16_TO_LREAL( q2 );     (* 0.5 *)
r4 := FIX16_TO_LREAL( q4 );      (* -0.25 *)
r8 := FIX16_TO_LREAL( q8 );     (* -0.75 *)
r12 := FIX16_TO_LREAL( q12 );   (* 2.30078125 *)
r15 := FIX16_TO_LREAL( q15 );   (* 0.600006103515625 *)

Requirements