FB_BA_Scale_04_Y2_3

The template is a setpoint program for an extract air/supply air cascade with only one room temperature setpoint, including summer and winter compensation.

Setpoint program for supply air temperature control with a supply air temperature setpoint, including summer/winter compensation via a characteristic curve.

The supply air temperature setpoint is determined by the function block Scale depending on the outside temperature.

	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
  fTWth    : 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;
  X4       : FB_BA_AV_Op;
  Y1       : FB_BA_AV_Op;
  Y2_3     : FB_BA_AV_Op;
  Y4       : FB_BA_AV_Op;
  Y        : FB_BA_AV_Op;
END_VAR
VAR
  Scale    : FB_BA_Chrct04;
END_VAR

Inputs

Name	Type	Description
fTWth	REAL	Current value of the outside temperature.

Outputs

Name	Type	Description
fY	REAL	Calculated setpoint for the room temperature.

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.
X4	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point X4.
Y1	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point Y1.
Y2_3	FB_BA_AV_Op	The AV object is used to specify the value for the interpolation points Y2/Y3.
Y4	FB_BA_AV_Op	The AV object is used to specify the value for interpolation point Y4.
Y	FB_BA_AV_Op	Output of the calculated, simple room temperature setpoint. It is output at output fY.

Variables

Name	Type	Description
Scale	FB_BA_Chrct04	The function block represents a linear interpolation with four interpolation points and can be used to generate a characteristic curve. The function block calculates the setpoint curve for the current room temperature, depending on the outside temperature.

Requirements

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