FireDamperMotSmoke

FireDamperMotSmoke (FB)

FUNCTION_BLOCK FireDamperMotSmoke

Short description

Control of a motorized fire damper with two position feedbacks Additional functions: Functional test of the fire damper Typical application: Control of a fire damper in an HVAC system

Representation

Function description

General

This function block controls a binary motorized fire damper ( xEn = TRUE ), monitors the run times during opening and closing operations and can perform a complete fire damper test. The function block can be operated either in normal mode or in test mode. The test mode has higher priority than normal mode and can be triggered by a rising edge at the input xTestEx and / or at the setpoint / parameter xRunTest being triggered.

Enable opening / closing of the fire damper before manual override xAB

The enable for opening / closing of the fire damper before manual override xAB is passed unchanged from the request to open / close the fire damper xEn if the fire damper test is not active.

Enable opening / closing of the fire damper after manual override xHB

The enable for opening / closing of the fire damper after manual override xHB corresponds to the enable for opening / closing of the fire damper before manual override xAB additionally extended by a manual override module

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 = any

Aggregate fault xAlarm

The aggregate fault xAlarm is activated ( = TRUE ) if at least one of the conditions described below is met:

1) The fault message for the open feedback xAlarmOpen is active ( = TRUE ). 2) The fault message for the closed feedback *xAlarmClosed* is active ( = TRUE ). 3) The fire damper is not fully open ( *xOpen* = FALSE ). ( Background: Any fire damper that is not fully open represents a faulty condition in normal operation ). 4) The input *xAlarmIn* is active ( = TRUE ). 5) The input *xSmokeAlarm* is active ( = TRUE ). In all other cases the aggregated fault *xAlarm* is not activated ( = FALSE ).

Enable / disable the fault message for the open feedback xAlarmOpen

Monitoring of the damper run time during the opening operation against an adjustable maximum value ( tOpen ) starts if, in normal operation, at least one of the conditions described below is met:

1) A rising edge ( FALSE > TRUE ) is detected at the output xHB ( = normal case ). 2) The request to open is active ( *xEn* = TRUE ) and at the same time a rising edge ( FALSE > TRUE ) is detected on the input *xQuit*. 3) The output *xHB* is active ( = TRUE ) and at the same time a falling edge ( TRUE > FALSE ) is detected on the input *xOpen*. The fault message for the open feedback *xAlarmOpen* is activated ( = TRUE ) if, after the expiration of the maximum run time **tOpen** with the output active ( *xHB* = TRUE ), at least one of the following conditions is met: 1) The full open feedback is not active ( *xOpen* = FALSE ) ( = normal case ). 2) The feedbacks *xOpen* and *xClosed* have the same state. The fault message for the open feedback *xAlarmOpen* is deactivated ( = FALSE ) if a rising edge ( FALSE > TRUE ) is detected on the input *xQuit*.

Enable / disable the fault message for the closed feedback xAlarmClosed

Monitoring of the damper run time during the closing operation against an adjustable maximum value ( tclose ) starts if, in normal operation, at least one of the conditions described below is met:

1) A falling edge ( TRUE > FALSE ) is detected at the output xHB ( = normal case ). 2) The request to close is active ( *xEn* = FALSE ) and at the same time a rising edge ( FALSE > TRUE ) is detected on the input *xQuit*. The fault message for the closed feedback *xAlarmClosed* is activated ( = TRUE ) if, after the expiration of the maximum run time **tClose** with the output not active ( *xHB* = FALSE ), at least one of the following conditions is met: 1) The full closed feedback is not active ( *xClosed* = FALSE ) ( = normal case ). 2) The feedbacks *xOpen* and *xClosed* have the same state. The fault message for the closed feedback *xAlarmClosed* is deactivated ( = FALSE ) if a rising edge ( FALSE > TRUE ) is detected on the input *xQuit*.

Duration of the last full opening tLastOpen

The measurement of the duration begins whenever at least one of the conditions described below is met:

1) A rising edge ( FALSE > TRUE ) is detected on the input xOpen is detected. 2) A falling edge ( TRUE > FALSE ) is detected on the input *xOpen*. 3) A rising edge ( FALSE > TRUE ) is detected on the input *xClosed*. 4) A falling edge ( TRUE > FALSE ) is detected on the input *xClosed*. ( Normal case ) 5) A rising edge ( FALSE > TRUE ) is detected on the output *xHB*. 6) A falling edge ( TRUE > FALSE ) is detected on the output *xHB*. The runtime is available at this output after each rising edge on the full open feedback *xOpen* ( FALSE > TRUE ).

Duration of the last full closing tLastClosed

The measurement of the duration begins whenever at least one of the conditions described below is met:

1) A rising edge ( FALSE > TRUE ) is detected on the input xOpen is detected. 2) A falling edge ( TRUE > FALSE ) is detected on the input *xOpen*. ( Normal case ) 3) A rising edge ( FALSE > TRUE ) is detected on the input *xClosed*. 4) A falling edge ( TRUE > FALSE ) is detected on the input *xClosed*. 5) A rising edge ( FALSE > TRUE ) is detected on the output *xHB*. 6) A falling edge ( TRUE > FALSE ) is detected on the output *xHB*. The runtime is available at this output after each rising edge on the full closed feedback *xClosed* ( FALSE > TRUE ).

Duration of the current opening / closing in tRunTime

The current runtime is available at this output during each runtime measurement.

Testing the functions of the fire damper ( test mode )

The test mode is always generally triggered if at least one of the conditions described below is met:

1) A rising edge ( FALSE > TRUE ) is detected on the input xTestEx is detected. 2) The active state ( = TRUE ) on the setpoint / parameter *xRunTest* is detected. The active state is immediately reset ( = FALSE ) after detection. However, the actual test mode only takes place if the feedback of automatic operation *eAOO* ( 0 = automatic, >0 = manual ) contains the value 0 and at the same time the mode of the manual override for the digital output *xHB* signals automatic operation ( eMANBIN = eMANBIN.Auto ). In test mode a closing and subsequent opening of the fire damper is performed, each with runtime monitoring. At the beginning of the test mode the outputs *xAlarmOpen*, *xAlarmClosed*, *tTestOpen*, *tTestClosed* and *xTestOK* are reset ( = FALSE ). Now the control command for closing is issued and the runtime is monitored for exceeding the maximum value **tClosed**. If the correct feedback situation ( *xClosed* = TRUE and *xOpen* = FALSE ) is reached without exceeding the maximum value, the output *xAlarmClosed* is not activated ( = FALSE ). In all other situations the output *xAlarmClosed* is activated ( = TRUE ). Now the control command for opening is issued and the runtime is monitored for exceeding the maximum value **tOpen**. If the correct feedback situation ( *xOpen* = TRUE and *xClosed* = FALSE ) is reached without exceeding the maximum value, the output *xAlarmOpen* is not activated ( = FALSE ). In all other situations the output *xAlarmOpen* is activated ( = TRUE ). The result indicator for the fire damper test *xTestOK* is activated ( = test successful ) if neither of the two outputs *xAlarmOpen* or *xAlarmClosed* is active ( = TRUE ). The achieved values *tLastOpen* and *tLastClosed* are each placed on the outputs *tTestOpen* and *tTestClosed* and stored until the next fire damper test. The test mode ends automatically as soon as the testing of the fire damper is completed.

Prerequisites

Prerequisite for the use of the function block FireDamperMot

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

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xEn	BOOL
Input	xAlarmIn	BOOL	FALSE
Input	eAOO	eManBin	eManBin.Auto
Input	xOpen	BOOL
Input	xClosed	BOOL
Input	xQuit	BOOL	FALSE
Input	xTestEx	BOOL	FALSE
Input	xSmokeAlarm	BOOL	FALSE
Output	sLine1	STRING
Output	sLine2	STRING
Output	sText	STRING
Output	xHB	BOOL
Output	xAB	BOOL
Output	xAlarm	BOOL
Output	xAlarmOpen	BOOL
Output	xAlarmClosed	BOOL
Output	xTestOK	BOOL
Output	tLastOpen	TIME
Output	tLastClosed	TIME
Output	tTestOpen	TIME
Output	tTestClosed	TIME
Output	tRunTime	TIME
Output	xAuto	BOOL
Input Const	udiOpen	UDINT	150
Input Const	udiClose	UDINT	25
Input Const	eManModeB	eMANBIN	eMANBIN.Auto
Input Const	xRunTest	BOOL	FALSE
Input Const	sEditLine2	STRING	‘’
Input Const	sEditLine1	STRING	‘Room’