HeatCurve4P_DN

HeatCurve4P_DN (FB)

FUNCTION_BLOCK HeatCurve4P_DN

Short description

Heating curve with four outdoor temperature points and two characteristic curves (night, day).

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
rOutTemp	REAL	-50.0 … +50.0 °C	0	Outdoor temperature for calculating the characteristic curves
xDay	BOOL			Operating mode (FALSE = night mode / TRUE = day mode)

Outputs

Name	Data type	Value range	Initial value	Function
rSupplyTemp	REAL		0.0 °C	Desired supply temperature of the active characteristic curve

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
eManModeN	eManNum		eManNum.Auto	Operating mode for the desired supply temperature rSupplyTemp
rManValue	REAL		0.0 °C	Manual value for the operating mode eManNum.Man
rSupplyTempMin	REAL		20.0 °C	Absolute minimum desired supply temperature
rSupplyTempMax	REAL		70.0 °C	Absolute maximum desired supply temperature
rTo1	REAL		-15.0 °C	Outdoor temperature for point 1
rW1Day	REAL		70.0 °C	Desired supply temperature for outdoor temperature point 1 - day curve
rW1Night	REAL		65.0 °C	Desired supply temperature for outdoor temperature point 1 - night curve
rTo2	REAL		-5.0 °C	Outdoor temperature for point 2
rW2Day	REAL		60.0 °C	Desired supply temperature for outdoor temperature point 2 - day curve
rW2Night	REAL		55.0 °C	Desired supply temperature for outdoor temperature point 2 - night curve
rTo3	REAL		5.0 °C	Outdoor temperature for point 3
rW3Day	REAL		50.0 °C	Desired supply temperature for outdoor temperature point 3 - day curve
rW3Night	REAL		45.0 °C	Desired supply temperature for outdoor temperature point 3 - night curve
rTo4	REAL		15.0 °C	Outdoor temperature for point 4
rW4Day	REAL		40.0 °C	Desired supply temperature for outdoor temperature point 4 - day curve
rW4Night	REAL		35.0 °C	Desired supply temperature for outdoor temperature point 4 - night curve
rButtonJump	REAL		1.0 °C	Function not yet implemented.
rSupplyTempMaxScale	REAL		90.0 °C	Maximum temperature for scaling the Y-axis (VISU). Slider shown only at 90°C!
rBorderDistance	REAL		3.0 °C	Border distance to the right/left edge in degrees Celsius for the X-axis (VISU)

Function description

The desired supply temperature *rSupplyTemp* is calculated depending on the current outdoor temperature *rOutTemp* and the selected characteristic curve (night curve: *xDay* = FALSE // day curve: *xDay* = TRUE). The desired supply temperature *rSupplyTemp* is limited by configurable absolute minimum ( **rSupplyTempMin** ) and maximum values ( **rSupplyTempMax** ). The characteristic curves are defined and configurable by four outdoor temperature points each (separate for the night and day curve). Each point is defined by an outdoor temperature and an associated desired supply temperature. The four outdoor temperature points of a characteristic curve are connected to each other by straight lines.

Restriction

To4 > rTo3 > rTo2 > rTo1

The parameter **eManModeN** allows switching the desired supply temperature *rSupplyTemp* from automatic to manual mode and vice versa. In manual mode, the desired supply temperature *rSupplyTemp* takes the value of the parameter **rManValue**. \

Visualization

Matching visualization element from the HVACV Visu Library: HeatCurve4P_DN

Representation

Interfaces visual element

Name	Data type	Type	Initial value	Function
FB_HeatCurve4P_DN	HeatCurve4P_DN	VAR_IN_OUT		Enter FB instance HVAC.HeatCurve4P_DN here, e.g. PRG.HeatCurve4P_DN

Note: VAR_IN_OUT interfaces must be assigned, VAR_INPUT are optional.\

CODESYS

InOut:

Scope	Name	Type	Initial
Input	rOutTemp	REAL	0
Input	xDay	BOOL
Input Const	rBorderDistance	REAL	3
Input Const	rSupplyTempMaxScale	REAL	90
Input Const	rButtonJump	REAL	1
Input Const	rW4Night	REAL	35
Input Const	rW4Day	REAL	40
Input Const	rTo4	REAL	15
Input Const	rW3Night	REAL	45
Input Const	rW3Day	REAL	50
Input Const	rTo3	REAL	5
Input Const	rW2Night	REAL	55
Input Const	rW2Day	REAL	60
Input Const	rTo2	REAL	-5
Input Const	rW1Night	REAL	65
Input Const	rW1Day	REAL	70
Input Const	rTo1	REAL	-15
Input Const	rSupplyTempMax	REAL	70
Input Const	rSupplyTempMin	REAL	20
Input Const	rManValue	REAL	0
Input Const	eManModeN	eManNum	eManNum.Auto
Output	rSupplyTemp	REAL	0