FireDamperMot_OnOff

FireDamperMot_OnOff (FB)

FUNCTION_BLOCK FireDamperMot_OnOff

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 = opening), monitors the run times during the opening and closing processes and can perform a full fire damper test. The function block can be operated either in normal operation or in test mode ( = fire damper test). The test mode has higher priority than normal operation and can be triggered by a rising edge at the input xTestEx and/or at the setpoint / parameter xRunTest is 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.

Release for opening / closing 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

Selection of operating mode wMode

The selection of the operating mode currently allows two valid variants:

1. 'wMode' = 1: The function block behaves like the function block 'FireDamperMot'

   1. xHB = TRUE: Immediate alarm message if the fire damper is not reported open (fire case)

   2. FDK test: fixed sequence — closing + opening

2. 'wMode' = 2: The function block can be used for applications in Switzerland, where the fire dampers are opened / closed in parallel with the demand of the HVAC system.

   1. xHB = FALSE: Immediate alarm message if the fire damper is not reported closed after the run time has elapsed

   2. xHB = TRUE: Immediate alarm message if the fire damper is not reported open after the run time has elapsed (fire case)

   3. FDK test: xClosed = TRUE: fixed sequence — opening + closing

   4. FDK test: xOpen = TRUE: fixed sequence — closing + opening

Aggregate fault xAlarm

'wMode' = 1: The combined 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). 4) The input *xAlarmIn* is active (= TRUE). In all other cases the combined fault xAlarm is not activated (= FALSE). 'wMode' = 2: The combined fault xAlarm is activated (= TRUE) if at least one of the conditions described below is given: 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) xHB = TRUE: The fire damper is not fully open (xOpen = FALSE). (Background: Any fire damper that is not fully open represents a faulty condition). 4) xHB = FALSE: The fire damper is not fully closed (xClosed = FALSE ). (Background: Any fire damper that is not fully closed represents a faulty condition). 5) The input xAlarmIn is active (= TRUE). In all other cases the combined fault xAlarm is not activated (= FALSE).

Enable / disable of the fault message for the opening feedback xAlarmOpen

Monitoring of the damper run time during the opening process 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 detected (= normal case). 2) The request to open is active (xEn = TRUE) and at the same time a rising edge (FALSE > TRUE) is detected at the input xQuit. 3) The output xHB is active (= TRUE) and at the same time a falling edge (TRUE > FALSE) is detected at the input xOpen. The fault message for the open feedback xAlarmOpen is activated (= TRUE) if, after the expiry of the maximum run time tOpen with the output active (xHB = TRUE), at least one of the following conditions is met: 1) The feedback for full opening 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 at the input xQuit.

Enable / disable of the fault message for the closing feedback xAlarmClosed

Monitoring of the damper run time during the closing process to 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 detected (= normal case). 2) The request to close is active (xEn = FALSE) and at the same time a rising edge (FALSE > TRUE) is detected at the input xQuit. The fault message for the closed feedback xAlarmClosed is activated (= TRUE) if, after the expiry of the maximum run time tClose with the output not active (xHB = FALSE), at least one of the following conditions is met: 1) The feedback for full closing 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 at the input xQuit.

Enable / disable of the fault message for the enabled but not opened fire damper after the run time has expired (FALSE = disabled, TRUE = enabled) xAlarmOn_Closed

The enable for the fault message is given (precondition: 'wMode' = 2) if, after expiry of any run time monitoring the enabled fire damper ('xHB' = TRUE) is not fully open ('xOpen' = FALSE) (= fire case). The fault message is deactivated (= FALSE) if at the input xQuit a rising edge (FALSE > TRUE) is detected. It is also deactivated (= FALSE) in all other modes ('wMode' <> 2).

Enable / disable of the fault message for the disabled but not closed fire damper after the run time has expired (FALSE = disabled, TRUE = enabled) xAlarmOff_Opened

The enable for the fault message is given (precondition: 'wMode' = 2) if, after expiry of any run time monitoring the disabled fire damper ('xHB' = FALSE) is not fully closed ('xClosed' = FALSE). The fault message is deactivated (= FALSE) if at the input xQuit a rising edge (FALSE > TRUE) is detected. It is also deactivated (= FALSE) in all other modes ('wMode' <> 2).

Duration of the last full opening tLastOpen

The measurement of the duration begins each time if at least one of the conditions described below is met:

1) A rising edge (FALSE > TRUE) is detected at the input xOpen detected. 2) A falling edge (TRUE > FALSE) is detected at the input xOpen. 3) A rising edge (FALSE > TRUE) is detected at the input xClosed. 4) A falling edge (TRUE > FALSE) is detected at the input xClosed. (Normal case) 5) A rising edge (FALSE > TRUE) is detected at the output xHB. 6) A falling edge (TRUE > FALSE) is detected at the output xHB. At this output, after every rising edge on the full opening feedback xOpen (FALSE > TRUE), the run time is available.

Duration of the last full closing tLastClosed

The measurement of the duration begins each time if at least one of the conditions described below is met:

1) A rising edge (FALSE > TRUE) is detected at the input xOpen detected. 2) A falling edge (TRUE > FALSE) is detected at the input xOpen. (Normal case) 3) A rising edge (FALSE > TRUE) is detected at the input xClosed. 4) A falling edge (TRUE > FALSE) is detected at the input xClosed. 5) A rising edge (FALSE > TRUE) is detected at the output xHB. 6) A falling edge (TRUE > FALSE) is detected at the output xHB. After each rising edge on the feedback of full closing xClosed (FALSE > TRUE), the run time is available at this output.

Duration of the current opening / closing in tRunTime

During each run time measurement the current run time is available at this output.

Testing the functions of the fire damper (test mode)

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 at the input xTestEx detected. 2) The active state (= TRUE) is detected on the setpoint / parameter xRunTest. 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 operating mode of the manual override for the digital output xHB signals automatic operation (eMANBIN = eMANBIN.Auto). 'wMode' = 1: In test mode a closing and subsequent opening of the fire damper is performed, each with run time 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 run time is monitored for exceeding the maximum value tClosed. If the correct feedback situation (xClosed = TRUE and xOpen = FALSE) is achieved 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 run time is monitored for exceeding the maximum value tOpen. If the correct feedback situation (xOpen = TRUE and xClosed = FALSE) is achieved 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 placed on the outputs tTestOpen and tTestClosed respectively and stored until the next fire damper test. The test mode ends automatically as soon as the test of the fire damper is completed. 'wMode' = 2: The sequence for the test mode is determined at the time of its initiation: a) 'xClosed' = TRUE: The sequence 'Opening - Closing' is executed b) 'xOpen' = TRUE: The sequence 'Closing - Opening' is executed Sequence Closing - Opening: In test mode a closing and subsequent opening of the fire damper is performed, each with run time 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 run time is monitored for exceeding the maximum value tClosed. If the correct feedback situation (xClosed = TRUE and xOpen = FALSE) is achieved 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 run time is monitored for exceeding the maximum value tOpen. If the correct feedback situation (xOpen = TRUE and xClosed = FALSE) is achieved 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 placed on the outputs tTestOpen and tTestClosed respectively and stored until the next fire damper test. The test mode ends automatically as soon as the test of the fire damper is completed. Sequence Opening - Closing: In test mode an opening and subsequent closing of the fire damper is performed, each with run time monitoring. At the beginning of the test mode the outputs xAlarmOpen, xAlarmClosed, tTestOpen, tTestClosed and xTestOK are reset (= FALSE). Now the control command for opening is issued and the run time is monitored for exceeding the maximum value tOpen. If the correct feedback situation (xOpen = TRUE and xClosed = FALSE) is achieved without exceeding the maximum value, the output xAlarmOpen is not activated (= FALSE). In all other situations the output xAlarmOpen is activated (= TRUE). Now the control command for closing is issued and the run time is monitored for exceeding the maximum value tClosed. If the correct feedback situation (xClosed = TRUE and xOpen = FALSE) is achieved without exceeding the maximum value, the output xAlarmClosed is not activated (= FALSE). In all other situations the output xAlarmClosed 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 placed on the outputs tTestOpen and tTestClosed respectively and stored until the next fire damper test. The test mode ends automatically as soon as the test of the fire damper is completed.

Prerequisites

Prerequisite for the use of the function block FireDamperMot_OnOff

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	wMode	WORD	2
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	xAlarmOn_Closed	BOOL
Output	xAlarmOff_Opened	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’