Damper2P (FB)

FUNCTION_BLOCK Damper2P

Short Description

Control of a binary damper actuator with two position feedbacks

Typical application: Outside and return air dampers of a HVAC system

Portrayal

Interfaces

Inputs

Name	Datatype	Range	Init-Value	Function
xEn	BOOL			Enable
eAOO	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn	HVACTYPES.eManBin.Auto	Operating mode of manual override - Hardware
xOpen	BOOL			Feedback of damper opening
xClosed	BOOL			Feedback of damper closing

Outputs

Name	Datatype	Range	Init-Value	Function
xHB	BOOL			Enable damper actuator after manual override
xAB	BOOL			Release damper actuator before manual override
xAlarmOpen	BOOL			Fault Position of damper opening
xAlarmClosed	BOOL			Fault Position Damper closing
xAlarm	BOOL			fault message

Setpoints / Parameters

Name	Datatype	Range	Init-Value	Function
udiControlTime	UDINT	10s ... 600s	150s	Signal delay of position monitoring
xControl	BOOL		TRUE	Enabling position monitoring
eManModeB	eMANBIN	eMANBIN.Auto, eMANBIN.ManOff, eMANBIN.ManOn	eMANBIN.Auto	Operating mode of manual override for the xHB digital output

Functional description

Automatic output xAB

The xAB enabling of the damper actuator before manual override is taken over unchanged by the XEn enabling input

*xHB*manual output

The xHB enabling of the damper actuator after manual override corresponds to the *xAB*enabling of the damper actuator before manual override

Additionally extended at a manual override module.

xAB	eManModeB	xHB	Notes
FALSE	eMANBIN.Auto	FALSE	Manual override module in automatic mode
TRUE	eMANBIN.Auto	TRUE	Manual override module in automatic mode
X	eMANBIN.ManOn	TRUE	Manual override module in manual mode On
X	eMANBIN.ManOff	FALSE	Manual override module in manual mode Off

Legend: X = any

xAlarmOpen fault position damper opening

The xAlarmOpen fault message for the position on damper opening is activated (*xAlarmOpen*= TRUE) if the following conditions are met simultaneously:

The enabling of the xControl position monitoring is enabled (= TRUE)

Automatic mode is selected as operating mode of the manual override- hardware eAOO (eAOO = HVACTYPES.eManBin.auto)

The states of the enabling of the damper actuator after xHB manual override and the xOpen feedback for the damper opening are different at least during

the udiControlTime message delay of the position monitoring (( *xHB*= FALSE and *xOpen*= TRUE) OR ( *xHB*= TRUE and *xOpen*= FALSE))

The xAlarmOpen fault message for the position on the damper opening is deactivated if at least one of the above conditions is no longer met.

xAlarmClosed fault position damper opening

The xAlarmClosed fault message for the position on damper opening is activated ( *xAlarmClosed*= TRUE) if the following conditions are met simultaneously:

The enabling of the xControl position monitoring is enabled (= TRUE)

Automatic mode is selected as operating mode of the manual override- hardware eAOO (eAOO = HVACTYPES.eManBin.auto)

The states of the enabling of the damper actuator after *xHB*manual override and the *xClosed*feedback for the damper opening are different at least while

the udiControlTime message delay of the position monitoring is always the same (( xHB = TRUE and xOpen = TRUE) OR (*xHB*= FALSE and *xOpen*= FALSE))

The xAlarmClosed fault message for the position on the damper opening is deactivated if at least one of the above conditions is no longer met.

xAlarm collective fault

The xAlarm collective fault is activated (= TRUE) if at least one of the two faults (xAlarmOpen and xAlarmClosed) for the positions of the damper is active.

In all other cases, the xAlarm collective fault is not activated (= FALSE).

Visualization

Information

Element	Authors	Date	Version	Note
Function	Alexander Halter	04.2016	1.0	Initial version
Programming	Adam Bartod, Lukas Pfänder	04.2016	1.0	Initial version
Test	Alexander Halter	04.2016	1.0	Initial version
Documentation	Jochen Reu	11.2017	1.0	Initial version

Codesys

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL		Enable
	eAOO	eManBin	HVACTYPES.eManBin.Auto	Operating mode of manual override - Hardware
	xOpen	BOOL		Feedback of damper opening
	xClosed	BOOL		Feedback of damper closing
Output	xHB	BOOL		Enable damper actuator after manual override
	xAB	BOOL		Release damper actuator before manual override
	xAlarmOpen	BOOL		Fault Position of damper opening
	xAlarmClosed	BOOL		Fault Position Damper closing
	xAlarm	BOOL		fault message
Input	udiControlTime	UDINT	150	Signal delay of position monitoring
	xControl	BOOL	TRUE	Enabling position monitoring
	eManModeB	eMANBIN	eMANBIN.Auto	Operating mode of manual override for the xHB digital output