ScaleLin

Function 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

Inputs	Data Type	Description
IN	REAL	Real value.
IMIN	REAL	Minimum input value.
IMAX	REAL	Minimum input value.
OMIN	REAL	Minimum output value.
OMAX	REAL	Minimum output value.

Outputs

Output	Data Type	Description
Q	REAL	Result: OMIN + IN * (OMAX - OMIN) / (IMAX - IMIN).

Truth Table

Inputs	OUT
IMIN >= IMAX	= IN
IN < IMIN	= OMIN
IN > IMAX	= OMAX
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