FB_BA_Scale_03

The template represents a linear interpolation with three interpolation points and can be used to generate a characteristic curve. The characteristic curve is determined by the interpolation points [X1/Y1] to [X3/Y3]. The calculated output value fY is limited by YMin or YMax.

	The initialization of the template takes place within the method FB_Init.

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_Scale_04 EXTENDS FB_BA_View
VAR_INPUT
  fX       : REAL;
END_VAR
VAR_OUTPUT
  fY       : REAL;
END_VAR
VAR_INPUT CONSTANT
  X1       : FB_BA_AV_Op;
  X2       : FB_BA_AV_Op;
  X3       : FB_BA_AV_Op;
  Y1       : FB_BA_AV_Op;
  Y2       : FB_BA_AV_Op;
  Y3       : FB_BA_AV_Op;
  YMin     : FB_BA_AV_Op;
  YMax     : FB_BA_AV_Op;
  Y        : FB_BA_AV_Op;
END_VAR
VAR
  Scale    : FB_BA_Chrct03;
END_VAR

Inputs

Name	Type	Description
fX	REAL	Input value of the characteristic curve.

Outputs

Name	Type	Description
fY	REAL	Calculated output value of the characteristic curve.

Inputs CONSTANT

Name	Type	Description
X1	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point X1.
X2	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point X2.
X3	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point X3.
Y1	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point Y1.
Y2	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point Y2.
Y3	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point Y3.
YMin	FB_BA_AV_Op	The AV object is used to specify the value for the minimum limit of fY.
YMax	FB_BA_AV_Op	The AV object is used to specify the value for the maximum limit of fY.
Y	FB_BA_AV_Op	Output of the calculated output value of the characteristic curve.

Variables

Name	Type	Description
Scale	FB_BA_Chrct03	The function block represents a linear interpolation with three interpolation points and can be used to generate a characteristic curve.

Requirements

Development environment	Necessary function
TwinCAT from v3.1.4024.35	TF8040 \| TwinCAT Building Automation from V5.2.1.0