FanAnalog

FanAnalog (FB)

FUNCTION_BLOCK FanAnalog

Short description

Control of a variable-speed fan Additional functions: manual overrides, repair switch, operating hours counter, air shortage Typical application: control of a fan with a frequency converter

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xEn	BOOL			Demand for the fan ( FALSE = Off, TRUE = On )
rY	REAL			Control signal - speed 0.0 - 100.0 %
xForce	BOOL		FALSE	Forced lockout of the fan after manual override ( FALSE = Off, TRUE = On )
xFb	BOOL			Operating indication of the fan ( FALSE = Off, TRUE = On )
xPFb	BOOL			Feedback of the air shortage monitoring ( FALSE = air shortage, TRUE = no air shortage )
xMSwitch	BOOL		TRUE	Feedback of the repair switch ( FALSE = switch Off, TRUE = switch On )
xAlarmIn	BOOL			Fault indication of the fan ( FALSE = Off, TRUE = On )
eAOO	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn	HVACTYPES.eManBin.Auto	Operating mode of the manual override - hardware for the enable
eAO	HVACTYPES.eManNum	HVACTYPES.eManNum.Auto, HVACTYPES.eManNum.Man	HVACTYPES.eManNum.Auto	Operating mode of the manual override - hardware for the control signal
rPoti	REAL			Manual value - manual override - hardware for the control signal
rU	REAL			Feedback signal from the fan in %
xQuit	BOOL		FALSE	Reset of fault messages (monitorings) ( FALSE = Off, TRUE = On )

Outputs

Name	Data type	Value range	Initial value	Function
xHB	BOOL			Enable - fan after manual override ( FALSE = Off, TRUE = On )
xAB	BOOL			Enable - fan before manual override ( FALSE = Off, TRUE = On )
rHA	REAL			Control signal - fan after manual override in %
rAA	REAL			Control signal - fan before manual override in %
xAlarmFb	BOOL			Fault message of the operational monitoring ( FALSE = Off, TRUE = On )
xAlarmPFb	BOOL			Fault message of the air shortage monitoring ( FALSE = Off, TRUE = On )
dtLastFb	DATE_AND_TIME			Date/time of the fan’s last operation
udiOperatingHours	UDINT			Operating hours of the fan
udiCountFb	UDINT			Number of switch-ons of the fan
xAlarm	BOOL			Collective fault indication ( FALSE = Off, TRUE = On )
xAuto	BOOL			Collective indication - automatic operation ( FALSE = no automatic operation, TRUE = automatic operation )

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
udiPFbControlTime	UDINT	0 … 3600s	60s	Reporting delay of the air shortage monitoring in s
xPFbControl	BOOL		TRUE	Enable / disable of the air shortage monitoring ( FALSE = disabled, TRUE = enabled )
xAlarmControl	BOOL		TRUE	Influence of xAlarm on xAB ( FALSE = no influence, TRUE = lockout )
udiFbControlTime	UDINT	0 … 300s	60s	Reporting delay of the operational monitoring in s
xFbControl	BOOL		TRUE	Enable / disable of the operational monitoring ( FALSE = disabled, TRUE = enabled )
rManValue	REAL			Control signal in manual mode in %
eManModeN	eManNum	eManNum.Auto, eManNum.man	eManNum.Auto	Operating mode of the manual override for the control signal rHA
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 variable-speed fan by means of a continuous control signal rHA, which in automatic operation ( eManModeN = eManNum.Auto ) is taken unchanged from the input rY is adopted. The general enable of the fan is effected via the demand xEn and the enable signal xHB. Essentially the following function blocks are used:

ManBin

ManNum

AirShortage

CTime

OperatingHours

Enable - fan before manual override xAB

The enable - fan before manual override xAB is activated ( = TRUE ) if the following conditions are met at the same time: Case 1: &#xNAN;xEn = TRUE &#xNAN;xMSwitch = TRUE xAlarmControl = FALSE Case 2: &#xNAN;xEn = TRUE &#xNAN;xMSwitch = TRUE xAlarmControl = TRUE &#xNAN;xAlarm = FALSE In all other situations the enable - fan before manual override is xAB is not activated ( = FALSE ).

Enable - fan after manual override xHB

The enable - fan after manual override xHB corresponds to the enable - fan before manual override xAB, additionally extended by a manual override module. The enable can generally only occur if the forced lockout of the fan after manual override is not active ( xForce = FALSE ) and the collective fault indication is not active ( xAlarm = FALSE ).

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

Legend: X = don't care

Repair switch indication xMSwitch

xMSwitch = TRUE: repair switch not tripped (normal condition) &#xNAN;xMSwitch = FALSE: repair switch tripped (fault condition)

Forced lockout of the fan after manual override xForce

xForce = FALSE: no forced lockout ( normal state ) &#xNAN;xForce = TRUE: forced lockout ( exceptional state )

Operating hours and switching operations

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

Write access to the counters

Via the path ‘InstanceName._OperatingHours.udiOperatingHours’ or ‘InstanceName._OperatingHours.udiCountFb’ a write access to both counter values is possible.\

Prerequisite for the use of the FanAnalog function block

The use of the TimeRead2 function block is required for correct operation.

Date/time of the fan’s last operation 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 before the first counting process, the initialization value DT#1970-1-1-0.0.0 is output.

Operating monitoring

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

Air shortage monitoring

The air shortage monitoring is carried out by evaluating the states at the inputs xPFb or xFb. The fault message of the air shortage monitoring xAlarmPFb is activated ( = TRUE ) if with monitoring enabled ( xPFbControl = TRUE ) during the reporting delay of the air shortage monitoring udiPFbControlTime permanently the input xPFb is not active ( = FALSE ) and the input xFb is active ( = TRUE ). The fault message of the air shortage monitoring xAlarmPFb is deactivated ( = FALSE ) if the conditions for activation are no longer given and at the same time the monitoring is disabled ( xPFbControl = FALSE ) and / or the reset of the fault messages (monitorings) is active ( xQuit = TRUE ).

General fault indication xAlarm

The general fault indication is activated (= TRUE) if at least one of the conditions described below is met. &#xNAN;xAlarmIn = TRUE (fan fault indication is active) &#xNAN;xAlarmFB = TRUE (fault from operation monitoring) &#xNAN;xAlarmPFB = TRUE (fault from air shortage monitoring) &#xNAN;xMSwitch = FALSE ( repair switch in Off position ) In all other cases the collective fault is not active ( = FALSE ).

Control signal fan before manual override rAA

The control signal of the fan before manual override rAA is taken unchanged from the input Control signal - speed rY if either the output xHB and / or the input xFb are active. In all other situations the control signal rAA is fixed to the value 0.0 %.

Control signal fan after manual override rHA

The control signal of the damper actuator after manual override rHA corresponds to the control signal of the fan before manual override rAA additionally extended by a manual override module.

rAA	eManModeN	rHA	Notes
X	eMANNUM.Auto	rAA	Manual override module in automatic
X	eMANNUM.Man	rManValue	Manual override module in manual operation

Legend: X = don't care

Collective automatic mode message xAuto

The collective automatic mode message xAuto is set active ( = TRUE ) if the following conditions are met simultaneously:\

• Input eAOO = HVACTYPES.eManBin.Auto

• Input eAO = HVACTYPES.eManNum.Auto

• Setpoint / parameter eManModeB = eMANBIN.Auto

• Setpoint / parameter eManModeN = eMANNUM.Auto

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xEn	BOOL
Input	rY	REAL
Input	xForce	BOOL	FALSE
Input	xFb	BOOL
Input	xPFb	BOOL
Input	xMSwitch	BOOL	TRUE
Input	xAlarmIn	BOOL
Input	eAOO	eManBin	eManBin.Auto
Input	eAO	eManNum	eManNum.Auto
Input	rPoti	REAL
Input	rU	REAL
Input	xQuit	BOOL	FALSE
Output	xHB	BOOL
Output	xAB	BOOL
Output	rHA	REAL
Output	rAA	REAL
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	rManValue	REAL
Input Const	eManModeN	eMANNUM	eMANNUM.Auto
Input Const	eManModeB	eMANBIN	eMANBIN.Auto

Methods:

mQuit

mResetOperatingHours

Structure:

• mQuit (Method)

• mResetOperatingHours (Method)