ScaleLinPLCopen motion icon

FunctionClosed A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Scaling - linear conversion.

Inputs

IN   : REAL  Real value
IMIN : REAL  Minimum input value
IMAX : REAL  Maximum input value
OMIN : REAL  Minimum output value
OMAX : REAL  Maximum output value

Outputs

OUT : REAL   Result: OMIN + IN * (OMAX - OMIN) / (IMAX - IMIN)

Truth table

Inputs OUT

IMIN >=IMAX

= IN

IN < IMIN

= IMIN

IN >IMAX

= IMAX

other

= OMIN + IN * (OMAX - OMIN) / (IMAX - IMIN)

Remarks

ST Language

OUT := ScaleLin (IN, IMIN, IMAX, OMIN, OMAX);

FBD Language

FFLD Language

(* The function is executed only if EN is TRUE *)
(* ENO keeps the same value as EN *)

IL Language

Op1: LDClosed "Ladder diagram" Ladder logic is a method of drawing electrical logic schematics. It is now a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical "rails" and a series of horizontal "rungs" between them       IN
     ScaleLin IMAX, IMIN, OMAX, OMIN
     ST       OUT