Valve2P

Valve2P (FB)

FUNCTION_BLOCK Valve2P

Short description

Control of a binary valve actuator with two position feedbacks Typical application: Actuator of a boiler system with shut-off flaps

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xY	BOOL			Control signal
xForce	BOOL		FALSE	Forced override after manual override
xAlarmIn	BOOL		FALSE	Actuator fault message
eAOO	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn	HVACTYPES.eManBin.Auto	Operating mode of manual override - hardware
xOpen	BOOL			Valve open feedback
xClosed	BOOL			Valve closed feedback

Outputs

Name	Data type	Value range	Initial value	Function
xHB	BOOL			Actuator enable after manual override
xAB	BOOL			Actuator enable before manual override
xAlarmOpen	BOOL			Fault position valve open
xAlarmClosed	BOOL			Fault position valve closed
dtAbsLastOn	DATE_AND_TIME			Date / time of the last anti-blocking operation
xAlarm	BOOL			Aggregate fault
xAuto	BOOL			Collective automatic mode message

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
udiAbsTime	UDINT	0 … 600s	200s	Duration of the anti-blocking operation
todAbsStartTime	TOD	00:00:00 - 23:59:59 hrs	09:00:00 hrs	Time of the anti-blocking operation
eAbsDay	eDoW	eDow.Inactive, eDoW.Monday … eDoW.Sunday	eDoW.Monday	Weekday of the anti-blocking operation
udiControlTime	UDINT	10s … 600s	150s	Reporting delay of position monitoring
xControl	BOOL		TRUE	Enablement of the position monitoring
xForceOption	BOOL		FALSE	State of the output xHB under forced override
eManModeB	eMANBIN	eMANBIN.Auto, eMANBIN.ManOff, eMANBIN.ManOn	eMANBIN.Auto	Operating mode of the manual override for the digital output xHB

Function description

Automatic output xAB

The actuator enable before manual override xAB is passed unchanged from the enable input xY over.

Manual output xHB

The actuator enable after manual override xHB corresponds to the actuator enable before manual override xAB additionally extended by a manual override module and a forced override.

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

Legend: X = don't care

Fault position valve open xAlarmOpen

The fault message for the position at valve opening xAlarmOpen is activated ( xAlarmOpen = TRUE ), if the following conditions are met simultaneously:

1) The enable for position monitoring xControl is enabled ( = TRUE ) 2) As operating mode of the manual override - hardware *eAOO* the automatic mode is selected ( *eAOO* = HVACTYPES.eManBin.Auto ) 3) The states of the actuator enable after manual override *xHB* and the feedback for valve opening *xOpen* are continuously different for at least the reporting delay of position monitoring **udiControlTime** ( ( *xHB* = FALSE and *xOpen* = TRUE ) OR ( *xHB* = TRUE and *xOpen* = FALSE ) ). The fault message for the position at valve opening *xAlarmOpen* is deactivated if at least one of the above conditions is no longer met.

Fault position valve open xAlarmClosed

The fault message for the position at valve opening xAlarmClosed is activated ( xAlarmClosed = TRUE ), if the following conditions are met simultaneously:

1) The enable for position monitoring xControl is enabled ( = TRUE ) 2) As operating mode of the manual override - hardware *eAOO* the automatic mode is selected ( *eAOO* = HVACTYPES.eManBin.Auto ) 3) The states of the actuator enable after manual override *xHB* and the feedback for valve closing *xClosed* are continuously equal for at least the reporting delay of position monitoring **udiControlTime** ( ( *xHB* = TRUE and *xOpen* = TRUE ) OR ( *xHB* = FALSE and *xOpen* = FALSE ) ). The fault message for the position at valve opening *xAlarmClosed* is deactivated if at least one of the above conditions is no longer met.

Aggregate fault xAlarm

The aggregate fault xAlarm is activated ( = TRUE ) if at least one of the two faults for the flap positions ( xAlarmOpen and xAlarmClosed ) or the input xAlarmIn is active. In all other cases the collective fault is xAlarm is not activated ( = FALSE ).

Anti-blocking module

The anti-blocking module is implemented by the binary anti-blocking module with adjustable duration ( FB: AbsB ). The duration udiAbsTime, the time todAbsStartTime and the weekday eAbsDay are adjustable. The minimum runtime to lock the anti-blocking operation is 30 s. The timestamp (date / time) of the last anti-blocking operation dtAbsLastOn is available.

Collective automatic mode message xAuto

The collective automatic mode message xAuto is activated ( = TRUE ) if the input eAOO has the value HVACTYPES.eManBin.Auto and the setpoint / parameter eManModeB contains the value eMANBIN.Auto. In all other cases the collective automatic mode message xAuto is not activated ( = FALSE ).

Forced override xForce

The forced override acts directly on the output xHB. With the parameter xForceOption it is defined which state the output xHB assumes at TRUE on the input xForce .

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xY	BOOL
Input	xForce	BOOL	FALSE
Input	xAlarmIn	BOOL	FALSE
Input	eAOO	eManBin	eManBin.Auto
Input	xOpen	BOOL
Input	xClosed	BOOL
Output	xHB	BOOL
Output	xAB	BOOL
Output	xAlarmOpen	BOOL
Output	xAlarmClosed	BOOL
Output	dtAbsLastOn	DT
Output	xAlarm	BOOL
Output	xAuto	BOOL
Input Const	udiAbsTime	UDINT	120
Input Const	todAbsStartTime	TOD	TIME_OF_DAY#8:0
Input Const	eAbsDay	eDoW	eDow.Monday
Input Const	udiControlTime	UDINT	200
Input Const	xControl	BOOL	TRUE
Input Const	xForceOption	BOOL	FALSE
Input Const	eManModeB	eMANBIN	eMANBIN.Auto