Fan1Speed (FB)¶

FUNCTION_BLOCK Fan1Speed

Short Description¶

Control of a single-stage fan

Additional functions: air deficiency monitoring, operation monitoring, repair switch, manual override, status display

Typical application: Control of a room exhaust fan

Portrayal¶

Interfaces¶

Inputs¶

Name
Datatype

Range

Init-Value

Function

XEn
BOOL
Requirement of the fan

xFb BOOL
Operating message of the fan

xPFb BOOL
Report of the air shortage situation

xMSwitch BOOL
Message from the repair switch

xAlarmIn BOOL
Fault message of the fan

eAOO HVACTYPES.eManBin HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn HVACTYPES.eManBin.Auto
Operating mode of manual override - hardware

xQuit BOOL FALSE
Resetting the fault messages (monitoring of operation, air-shortage monitoring)

outputs¶

Name
Datatype

Range

Init-Value

Function

xHB BOOL
Release - fan after manual override

xAB BOOL
Release - fan before manual override

xAlarmFb BOOL
Fault message of the operation monitoring

xAlarmPFb BOOL
Fault message of the air deficiency monitoring

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 activations of the circulating pump

xAlarm BOOL
collective fault message

sAlarm STRING
Message texts for faults

sStatus STRING
Message texts for the operating status

Setpoints / parameters¶

Name
Datatype

Range

Init-Value

Function

udiPFbControlTime UDINT 1 bis 3600s 30s
Message delay of the air deficiency monitoring

xAlarmControl BOOL FALSE
Influence of xAlarm on xAB

udiFbControlTime UDINT 0 ... 300s 60s
Message delay of the operation monitoring

xFbControl BOOL TRUE
Enabling / disabling operation monitoring

eManModeB eMANBIN eMANBIN.Auto, eMANBIN.ManOff, eMANBIN.ManOn eMANBIN.Auto
Operating mode of manual override for the digital output xHB

Functional Description¶

General¶

This function block controls a single-stage fan.

Essentially the following function blocks are used:

AirShortage

ManBin

OperatingHours

Release - fan before manual override xAB¶

The release - fan before manual override xAB is influenced by the request of the fan xEn, the collective fault message xAlarm ,
the message of the repair switch xMSwitch, the parameter xAlarmControl and the air deficiency monitoring.

The release - fan before manual override xAB is active (= TRUE), if the following conditions exist simultaneously:

case.

xEn = TRUE (request active)
xAlarm = FALSE (collective fault message not active)
xMSwitch = TRUE (motor protection switch not tripped)
xAlarmControl = FALSE (collective fault message and air deficiency monitoring not taken into account)

Case 2:

xEn = TRUE (request active)
xAlarm = FALSE (collective fault message not active)
xMSwitch = TRUE (motor protection switch not tripped)
xAlarmControl = TRUE (collective error message and air deficiency monitoring considered)
Air-shortage = FALSE (air-shortage not active)

In all other situations, the release - fan before manual override xAB is 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.

xAB eManModeB xHB
Note

FALSE eMANBIN.Auto FALSE
Manual override module in automatic operation

TRUE eMANBIN.Auto TRUE
Manual override module in automatic operation

X eMANBIN.ManOn TRUE
Manual override module in manual operation On

X eMANBIN.ManOff FALSE
Manual override module in manual operation Off

Legend: X = any

Message from the maintenance switch xMSwitch¶

xMSwitch = TRUE: Maintenance switch was not triggered (normal state)

xMSwitch = FALSE: Maintenance switch was triggered (error state)

Operating hours and power-on operations¶

The number of operating hours and the switch-on processes are recorded (= counting process active) if the operating message
of the fan xFb is active and at the same time the collective fault message xAlarm is not active (= FALSE).
The results are available at the counter outputs udiOperatingHours and udiCountFb.

Date / time of the last operation of the fan dtLastFb¶

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

Operation monitoring¶

The operation monitoring can be enabled by the setpoint / parameter xFbControl (= TRUE) or disabled (= FALSE).

If monitoring is disabled, the fault message of the operation monitoring xAlarmFb is always disabled (= FALSE).
If monitoring is enabled, the fault message of the operation monitoring xAlarmFb is activated (= TRUE) if
at the same time during a minimum period of time udiFbControlTime the following conditions are given:

xHB and xFb = unequal (enable state and operating state do not match)
eAOO = HVACTYPES.eManBin.Auto (manual override - hardware in automatic mode)
xFbControl              = TRUE  ( Betriebsüberwachung ist freigegeben )

The fault message of the operation monitoring xAlarmFb is reset (= FALSE), if at least one of the following
conditions is met:

eAOO = HVACTYPES.eManBin.Auto (downshift into automatic mode of manual override - hardware)
xQuit = TRUE (resetting the fault messages is active)
xFbControl = FALSE (operation monitoring disabled)

Air-shortage monitoring¶

It serves to detect a air-shortage by evaluating the signals at the inputs
Notification of the air shortage situation * xPFb * and the operating message of the fan xFb.

The output - Fault message xAlarmPFb is activated (xAlarmPFb = TRUE) if conditions 1 and 2 below are fulfilled at the same time.

Condition 1: The input for the differential pressure switch xPFb is permanently in the state FALSE (= air-shortage situation) at least during the waiting time udiPFbControlTime.

Condition 2: The operating message for the fan xFb is permanently in the TRUE state (= fan in operation) at least during the waiting time udiPFControlTime.

The output - Fault message xAlarmPFb is deactivated in the following cases (xAlarmPFb = FALSE):

Case 1: Conditions 1 and / or 2 are not fulfilled and the resetting of the fault message xQuit is active (= TRUE).

fault display¶

If required, the following fault texts are output at the sAlarm output (1 = highest priority)

1:
‘Fan Fault Hardware’ (xAlarmIn = TRUE)

2:
‘Fan fault operation monitoring’ (xAlarmFb = TRUE)

3:
Fan fault air-shortage (air-shortage fault = TRUE)

4:
‘Fan fault meintenance switch’ (xMSwitch = FALSE)

5:
‘’ (no fault active)

Collective fault message xAlarm¶

The collective fault message is activated (= TRUE) if at least one of the following conditions is fulfilled.

xAlarmIn = TRUE (fault message of the fan is active)
xAlarmFB = TRUE (error from the operation monitoring)
Air-shortage= TRUE (error from the air-shortage monitoring)
xMSwitch = FALSE (maintenance switch was triggered)

In all other cases, the group fault is not active (= FALSE).

Status display¶

If required, the following status texts are output on the sStatus outpu(1 = highest priority)

1:
‘Content of sAlarm‘ (sAlarm not equal to ‘’)

2:
‘On via automatic’ (eAOO = HVACTYPES.eManBin.Auto and eManModeB = eMANBIN.Auto and xFb = TRUE)

3:
‘Off via automatic’ (* eAOO * = HVACTYPES.eManBin.Auto and eManModeB = eMANBIN.Auto and xFb = FALSE)

4:
‘On via manual Software’ (* eAOO * = HVACTYPES.eManBin.Auto and eManModeB not equal to eMANBIN.Auto and xFb = TRUE)

5:
‘Off via manual Software’ (eAOO = HVACTYPES.eManBin.Auto and eManModeB not equal to eMANBIN.Auto and xFb = FALSE

6:
‘On via manual hardware’ (eAOO = not equal to HVACTYPES.eManBin.Auto and xFb = TRUE)

7:
‘Off via manual hardware’ (eAOO = not equal to HVACTYPES.eManBin.Auto and xFb = FALSE)

Visualization¶

Information¶

Element
Authors

Date
Version
Notes

Function
Alexander Halter 10.2017 1.0
Initial-version

Programming
Adam Bartod 10.2017 1.0
Initial-version

Test Alexander Halter 10.2017 1.0
Initial-version

Documentation
Jochen Reu 11.2017 1.0
Initial-version

Codesys¶

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL		Requirement of the fan
	xFb	BOOL		Operating message of the fan
	xPFb	BOOL		Report of the air shortage situation
	xMSwitch	BOOL		Message from the repair switch
	xAlarmIn	BOOL		Fault message of the fan
	eAOO	eManBin	HVACTYPES.eManBin.Auto	Operating mode of manual override - hardware
	xQuit	BOOL	FALSE	Resetting the fault messages (monitoring of operation, air-shortage monitoring)
Output	xHB	BOOL		Release - fan after manual override
	xAB	BOOL		Release - fan before manual override
	xAlarmFb	BOOL		Fault message of the operation monitoring
	xAlarmPFb	BOOL		Fault message of the air deficiency monitoring
	dtLastFb	DT		Date / time of the last operation of the fan
	udiOperatingHours	UDINT		Operating hours of the circulation pump
	udiCountFb	UDINT		Number of activations of the fan
	xAlarm	BOOL		collective fault
	sAlarm	STRING		Message texts for faults
	sStatus	STRING		Message texts for the operating status
Input	udiPFbControlTime	UDINT	30	Message delay of the air deficiency monitoring
	xAlarmControl	BOOL	FALSE	Influence of xAlarm on xAB
	udiFbControlTime	UDINT	60	Message delay of the operation monitoring
	xFbControl	BOOL	TRUE	Enabling / disabling operation monitoring
	eManModeB	eMANBIN	eMANBIN.Auto	Operating mode of manual override for the digital output xHB

Fan1Speed ​​(FB)¶