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ScaleLin

FunctionA 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

In FFLD language, the operation is executed only if the input rung (EN) is TRUE. The output rung (ENO) keeps the same value as the input rung.
In IL"Instruction list" This is a low-level language and resembles assembly, the input must be loaded in the current result before calling the function.

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: LD"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

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