FireDamperMot

FireDamperMot (FB)

FUNCTION_BLOCK FireDamperMot

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 the opening and closing processes and can perform a full fire damper test. The function block can be operated either in normal mode or in test mode. 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 is triggered.

Release for opening / closing the fire damper before manual override xAB

The release for opening / closing 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 release for opening / closing the fire damper after manual override xHB corresponds to the release for opening / closing 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 opening feedback xAlarmOpen is active (= TRUE).

2. The fault message for the closing feedback xAlarmClosed is active (= TRUE).

3. The fire damper is not fully open (xOpen = FALSE). (Background: Any not fully open fire damper represents a faulty condition).

4. The input *xAlarmIn* is active (= TRUE). In all other cases the collective 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 opening feedback xAlarmOpen* is activated (= TRUE) if after expiration of the maximum run time tOpen with active output (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 or xClosed have the same state.

The fault message for the opening 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 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 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 closing feedback xAlarmClosed is activated (= TRUE) if after expiration of the maximum run time tClose with inactive output (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 or xClosed have the same state. The fault message for the closing feedback xAlarmClosed is deactivated (= FALSE) if a rising edge (FALSE > TRUE) is detected at the input xQuit.

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. At this output, after every rising edge on the full closing feedback xClosed (FALSE > TRUE), the run time is available.

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 at 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 mode 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 mode (eMANBIN = eMANBIN.Auto). In test mode a closing and subsequent opening of the fire damper take place, 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 triggered and the run time is monitored for exceeding the maximum value tClosed monitored. 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 triggered and the run time is monitored for exceeding the maximum value tOpen monitored. 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 values achieved 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 fire damper check 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
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’