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

Input	Data Type	Range	Unit	Default	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	Range	Unit	Description
Q	REAL			Result: OMIN + IN * (OMAX - OMIN) / (IMAX - IMIN).

Remarks

Truth Table

Inputs	OUT
IMIN >= IMAX	= IN
IN < IMIN	= OMIN
IN > IMAX	= OMAX
other	= OMIN + IN * (OMAX - OMIN) / (IMAX - IMIN)

FBD Language Example

FFLD Language Example

• In the FFLD "Free Form Ladder Diagram" 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.
  • The function is executed only if EN is TRUE.
  • ENO keeps the same value as EN.

IL Language Example

• In the IL "Instruction List" This is a low-level language and resembles assembly Language, the input must be loaded in the current result before calling the function.

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

ST Language Example

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