Fan1Speed

Fan1Speed (FB)

FUNCTION_BLOCK Fan1Speed

Short description

Control of a single-stage fan Additional functions: air shortage monitoring, operating monitoring, maintenance switch, manual override, status indicator Typical application: control of a room exhaust fan

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xEn	BOOL			Fan request
xForce	BOOL		FALSE	Forced override after manual override
xFb	BOOL			Fan running indication
xPFb	BOOL			Air shortage indication
xMSwitch	BOOL		TRUE	Maintenance switch indication
xAlarmIn	BOOL			Fan fault indication
eAOO	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn	HVACTYPES.eManBin.Auto	Operating mode of manual override - hardware
xQuit	BOOL		FALSE	Reset of fault indications (operating monitoring, air shortage monitoring)

Outputs

Name	Data type	Value range	Initial value	Function
xHB	BOOL			Release - fan after manual override
xAB	BOOL			Release - fan before manual override
xAlarmFb	BOOL			Operating monitoring fault indication
xAlarmPFb	BOOL			Air shortage monitoring fault indication
dtLastFb	DATE_AND_TIME			Date / time of the last operation of the fan
udiOperatingHours	UDINT			Operating hours of the circulation pump
udiCountFb	UDINT			Number of starts of the circulation pump
xAlarm	BOOL			Collective fault indication
xAuto	BOOL			Collective automatic-mode message

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
udiPFbControlTime	UDINT	1 to 3600s	60s	Reporting delay of the air shortage monitoring
xPFbControl	BOOL		TRUE	Enable of the air shortage monitoring
xAlarmControl	BOOL		TRUE	Influence of xAlarm on xAB
udiFbControlTime	UDINT	0 … 300s	60s	Reporting delay of the operating monitoring
xFbControl	BOOL		TRUE	Enable / disable of the operating monitoring
xForceOption	BOOL		FALSE	State of the output xHB during 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

General

This function block controls a single-stage fan. The following function blocks are essentially used:

• AirShortage

• ManBin

• OperatingHours

Release - fan before manual override xAB

The release - fan before manual override xAB is influenced by the fan request xEn, the collective fault indication xAlarm, the maintenance switch indication xMSwitch, the parameter xAlarmControl and the air shortage monitoring. The release - fan before manual override xAB is active (= TRUE) if the following conditions are present simultaneously: Case 1: &#xNAN;xEn = TRUE (request active) &#xNAN;xMSwitch = TRUE (motor protection switch not tripped) xAlarmControl = FALSE (collective fault indication not considered) Case 2: &#xNAN;xEn = TRUE (request active) &#xNAN;xAlarm = FALSE (collective fault indication not active) &#xNAN;xMSwitch = TRUE (motor protection switch not tripped) xAlarmControl = TRUE (collective fault indication considered) In all other situations the release - fan before manual override xAB not active (= FALSE).

Release - fan after manual override xHB

The release - fan before manual override xHB corresponds to the release - fan before manual override xAB, additionally extended by a manual override module and by 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.ManOn	FALSE	X	TRUE	Manual override module in manual operation On
X	eMANBIN.ManOff	FALSE	X	FALSE	Manual override module in manual operation Off
X	X	TRUE	FALSE	FALSE	Forced override Off
X	X	TRUE	TRUE	TRUE	Forced override On

Legend: X = any

Maintenance switch indication xMSwitch

xMSwitch = TRUE: maintenance switch has not been triggered (normal state) &#xNAN;xMSwitch = FALSE: maintenance switch has been triggered (fault state)

Forced override xForce

The forced override acts directly on the output xHB. The parameter xForceOption determines which state the output xHB assumes when TRUE at the input xForce .

Operating hours and switching cycles

The number of operating hours and switching cycles are recorded (= counting process active) if the fan running indication xFb is active and at the same time the collective fault indication xAlarm is not active (= FALSE). The results are available at the counter outputs udiOperatingHours and udiCountFb available.

Write access to the counter values

Via the path 'InstanceName._OperatingHours.udiOperatingHours' or 'InstanceName._OperatingHours.udiCountFb' write access to both counters is possible.

Date / time of the last operation of the fan dtLastFb

At the output dtLastFb the current date / time is available during the counting process. At the output dtLastFb the date / time at the end of the last counting process is available outside the counting process. At the output dtLastFb the initialization value DT#1970-1-1-0.0.0 is output before the first counting process.

Operating monitoring

The operating monitoring can be enabled (= TRUE) or disabled (= FALSE) by the setpoint / parameter xFbControl When monitoring is disabled the operating monitoring fault indication xAlarmFb is always disabled (= FALSE). When monitoring is enabled the operating monitoring fault indication xAlarmFb is activated (= TRUE) if the following conditions are present simultaneously for a minimum duration udiFbControlTime as follows: &#xNAN;xHB and xFb = not equal (enable state and operating state do not match) &#xNAN;eAOO = HVACTYPES.eManBin.Auto (manual override - hardware in automatic) &#xNAN;xFbControl = TRUE (operating monitoring is enabled) The operating monitoring fault indication xAlarmFb is reset (= FALSE) if at least one of the following conditions is met: &#xNAN;eAOO = HVACTYPES.eManBin.Auto (switch back to automatic operation of the manual override - hardware) &#xNAN;xQuit = TRUE (reset of fault indications is active) &#xNAN;xFbControl = FALSE (operating monitoring disabled)

Air shortage monitoring

It serves to detect an air shortage situation by evaluating the signals at the inputs air shortage indication xPFb and the fan running indication xFb. The air shortage monitoring can be enabled (= TRUE) or disabled (= FALSE) by the setpoint / parameter xPFbControl In the disabled state the output - fault indication xAlarmPFb is not activated (= FALSE). The output - fault indication xAlarmPFb is activated (xAlarmPFb = TRUE) if the conditions 1 and 2 below are both met simultaneously. Condition 1: The input for the differential pressure switch xPFb remains for at least the waiting time udiPFbControlTime permanently in the state FALSE (= air shortage situation). Condition 2: The running indication for the fan xFb remains for at least the waiting time udiPFControlTime remains permanently in the state TRUE (= fan in operation). The output - fault indication xAlarmPFb is deactivated in the following cases (xAlarmPFb = FALSE): Case 1: Conditions 1 and / or 2 are not met and the reset of the fault indication xQuit is active (= TRUE).

Collective fault indication xAlarm

The collective fault indication is activated (= TRUE) if at least one of the following described conditions is met. &#xNAN;xAlarmIn = TRUE (fan fault indication is active) &#xNAN;xAlarmFB = TRUE (error from the operating monitoring) &#xNAN;xAlarmPFb = TRUE (error from the air shortage monitoring) &#xNAN;xMSwitch = FALSE (maintenance switch has been triggered) In all other cases the collective fault is not active (= FALSE).

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 has the value eMANBIN.Auto. In all other cases the collective automatic-mode message xAuto is not activated (= FALSE).

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xEn	BOOL
Input	xForce	BOOL	FALSE
Input	xFb	BOOL
Input	xPFb	BOOL
Input	xMSwitch	BOOL	TRUE
Input	xAlarmIn	BOOL
Input	eAOO	eManBin	eManBin.Auto
Input	xQuit	BOOL	FALSE
Output	xHB	BOOL
Output	xAB	BOOL
Output	xAlarmFb	BOOL
Output	xAlarmPFb	BOOL
Output	dtLastFb	DT
Output	udiOperatingHours	UDINT
Output	udiCountFb	UDINT
Output	xAlarm	BOOL
Output	xAuto	BOOL
Input Const	udiPFbControlTime	UDINT	60
Input Const	xPFbControl	BOOL	TRUE
Input Const	xAlarmControl	BOOL	TRUE
Input Const	udiFbControlTime	UDINT	60
Input Const	xFbControl	BOOL	TRUE
Input Const	xForceOption	BOOL	FALSE
Input Const	eManModeB	eMANBIN	eMANBIN.Auto

Methods:

mQuit

mResetOperatingHours

Structure:

• mQuit (Method)

• mResetOperatingHours (Method)