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Laboratory VAV controller (fume hood) · BACnet points list

Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) BACnet points list

Updated 6 November 2026

Short answer

Application 6742 runs a VAV fume hood with vertical sashes and a Venturi exhaust air valve on a Siemens BACnet programmable fume hood controller over BACnet MS/TP. It calculates the open sash area, sets the exhaust airflow setpoint to hold the face velocity setpoint, and drives the valve with a 0-10 V signal (EXH AO3) using a calibrated valve table. Occupied and unoccupied face velocity setpoints, sash alerts, flow warnings and alarms, and an emergency purge mode are built in.

This page lists 106 BACnet objects for the Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) — 98 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Siemens’s own free documentation, linked below.

Manufacturer
Siemens
Model
BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)
Equipment
Laboratory VAV controller (fume hood)
Equipment type
VAV boxes & fan coils
BACnet objects
106 (98 writable)
Transport
BACnet MS/TP
Firmware
Not stated
Also known as
Application 6742, App 6742, Siemens fume hood controller, Siemens FHC, VAV fume hood, venturi valve fume hood
Source document
BACnet Programmable Fume Hood Controller Vertical Sash Configuration with Damper or Venturi Valve, Application 6741 and Application 6742, Application Note · 140-1344 · rev. 2015-11-09
Download CSV 106 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Siemens’s current documentation and the live device before use. Not official Siemens information. Terms of use.

BMS integration notes: Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)

Integration in brief

Address the controller on the BACnet MS/TP trunk (manually or with auto addressing), calibrate the Venturi valve and set STARTUP MODE to normal. The BMS can set occupancy with OCC.UNOCC (BO 20) and the face velocity setpoints, and reads face velocity, exhaust airflow, sash area and the alarm points.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
BO 20OCC.UNOCCOCC = occupied face velocity setpoint in useCommand
AO 84OCC FV STPTOccupied face velocity setpoint, fpmCommand
AO 85UNOC FV STPTUnoccupied face velocity setpoint, fpmCommand
AO 4FACE VELCalculated face velocity, fpmCommand
AI 31EXH VOLMeasured hood exhaust airflow, cfmRead
AO 54FACE AREASash open area, ft²Command
BO 5LOW ALMLow flow alarmCommand
BO 6HIGH ALMHigh flow alarmCommand
BO 7EMER ALMEmergency purge alarmCommand
BO 8GEN FAILUREGeneral failure (sensor or hardware)Command

Enable & remote start

No enable point: the controller runs its sequence once STARTUP MODE (AO 21) is 0. OCC.UNOCC (BO 20) picks the occupied or unoccupied face velocity setpoint; the guide drives it from DI 2.

Network setup

Watch out for

Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

106 of 106 shown
Type
Access
Show
Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) BACnet Points List
DescriptionStates
AO1CTLR ADDRESSController MS/TP addressCommand
AO2APPLICATIONApplication number running in the controllerCommand
AOmin4FACE VELCalculated face velocityfpmCommand
BOmin5LOW ALMLow flow alarmCommand0=OFF, 1=ON
BOmin6HIGH ALMHigh flow alarmCommand0=OFF, 1=ON
BOmin7EMER ALMEmergency purge alarmCommand0=OFF, 1=ON
BOmin8GEN FAILUREGeneral failure (sensor or hardware)Command0=OFF, 1=ON
AO10HI ALM LMTHigh flow alarm limit, % of setpoint%Command
AO11HI WARN LMTHigh flow warning limit, % of setpoint%Command
AO12LOW WARN LMTLow flow warning limit, % of setpoint%Command
AO13LOW ALM LMTLow flow alarm limit, % of setpoint%Command
AO14EMER TIMEREmergency full-open timesCommand
AO15EMER STPTEmergency flow, % of the exhaust setpoint%Command
BO16LOW WARNLow flow warningCommand0=OFF, 1=ON
BO17HIGH WARNHigh flow warningCommand0=OFF, 1=ON
AO18ALARM TIMEDelay before a warning or alarm is setsCommand
BO19ALM AKNLGAlarm silenced from the display panelCommand0=OFF, 1=ON
BOmin20OCC.UNOCCOccupied/unoccupied modeCommand0=OCC, 1=UNOCC
AO21STARTUP MODENormal, decommission or startup mode (code)Command
BO22LEFT SWITCHLeft display panel buttonCommand0=OFF, 1=ON
BO23RIGHT SWITCHRight display panel buttonCommand0=OFF, 1=ON
BO24ATTN.UNATTNHood attended or unattendedCommand0=ATTN, 1=UNATTN
AO25AT ALRT AREASash open area alert limit, attendedft²Command
AO26UN ALRT AREASash open area alert limit, unattendedft²Command
AO27OPEN TIMETime the sash alert can be silencedsCommand
BO28SASH TONESash alert horn enabledCommand0=OFF, 1=ON
BO30SASH OP ALRTSash open too far alertCommand0=OFF, 1=ON
AImin31EXH VOLMeasured hood exhaust airflowcfmRead
AO32FLOW COEFAirflow pickup coefficientCommand
AO33DUCT AREAExhaust duct areaft²Command
AO34TRANS RANGEPressure transmitter rangeinH2OCommand
AO35LINEAR FL RGRange of a linear flow inputcfmCommand
AI36AVS2 PRESSAir velocity sensor 2 pressureinH2ORead
BI37DI 2Digital input 2Read0=OFF, 1=ON
BI38DI 6Digital input 6Read0=OFF, 1=ON
AO39AO 1Analog output 1VCommand
AO40EXH AO3Exhaust valve signal on AO 3VCommand
BO41DO 1Digital output 1Command0=OFF, 1=ON
BO42DO 2Digital output 2Command0=OFF, 1=ON
BO43DO 3Digital output 3Command0=OFF, 1=ON
BO44DO 4Digital output 4Command0=OFF, 1=ON
BO45DO 5Digital output 5Command0=OFF, 1=ON
BO46DECOM DO6Decommission output on DO 6Command0=OFF, 1=ON
BO47ALARM DO7Local alarm output on DO 7Command0=OFF, 1=ON
BO48AUTOZERO DO8Autozero module output on DO 8Command0=OFF, 1=ON
AI49AI 3Spare analog input 3VRead
AI50AI 4Spare analog input 4VRead
AI51AI 5Spare analog input 5kΩRead
AO52VERT SASH1Vertical sash 1 positioninCommand
AO53VERT SASH2Vertical sash 2 positioninCommand
AOmin54FACE AREACalculated sash open areaft²Command
AO55CAL SASH POSSash position used for calibrationinCommand
BO56CAL SASH LOCSash sensor calibration position selectCommand0=MIN, 1=MAX
AO57CAL SASH NUMSash sensor number to calibrateCommand
AO58DMPR CMDExhaust damper drive command (-100 to 100)%Command
BO60AVS FAILMODEExhaust valve action if the air velocity sensor failsCommand0=HOLD, 1=OPEN
AO61EXH P GAINExhaust flow loop proportional gainCommand
AO62EXH I GAINExhaust flow loop integral gainCommand
AO63EXH D GAINExhaust flow loop derivative gainCommand
AO64FIXED AREAFixed open area always includedft²Command
AO65VERT WIDTH1Vertical sash 1 widthinCommand
AO66VERT WIDTH2Vertical sash 2 widthinCommand
AO67VSASH HGHT1Vertical sash 1 full heightinCommand
AO68VSASH HGHT2Vertical sash 2 full heightinCommand
AO69TRACK HEIGHTSash track heightinCommand
AO70BYPASS HGHTBypass opening heightinCommand
AO71BYPASS OPENBypass open setting%Command
AO72FAIL AREAFace area used if the sash sensor failsft²Command
AO73EXTERNAL AExternal face area added to the calculationft²Command
AO74MAX EXT AREAExternal area at full AI 3 signalft²Command
AO75MIN EXTVOLTSAI 3 voltage for zero external areaVCommand
BO78CAL EXH VLVStart exhaust air valve calibrationCommand0=NO, 1=YES
BO79EXH VLV STATExhaust valve calibration statusCommand0=CAL OK, 1=NOTCAL
AO80EXH MAXMaximum exhaust airflowcfmCommand
AO81EXH MINMinimum exhaust airflowcfmCommand
AO82EXH STPTActive exhaust airflow setpointcfmCommand
AO83FVEL STPTActive face velocity setpointfpmCommand
AOmin84OCC FV STPTFace velocity setpoint, occupiedfpmCommand
AOmin85UNOC FV STPTFace velocity setpoint, unoccupiedfpmCommand
AO86OCC LOW FVLow face velocity choice from the display buttonsfpmCommand
AO87OCC HIGH FVHigh face velocity choice from the display buttonsfpmCommand
AO88OCC DELAYDelay before switching to the unoccupied face velocitysCommand
AO89EXH SIG AO2Exhaust flow signal out on AO 2VCommand
AO90AO2 RANGEExhaust flow at 10 V on AO 2cfmCommand
AO91AO2 DEADBANDDeadband for the AO 2 flow signal%Command
AO92AO2 V MINMinimum AO 2 output voltageVCommand
BO94CAL AIRStart air velocity sensor calibrationCommand0=NO, 1=YES
AO95CAL SETUPCalibration setup codeCommand
AO96CAL TIMERHours between automatic calibrationshCommand
AI97AVS1 PRESSAir velocity sensor 1 pressureinH2ORead
AO98LOOP TIMEControl loop intervalsCommand
AO99ERROR STATUSController error status codeCommand
AO106DISPLAY WTDisplay smoothing weight%Command
AO107DISPLAY RESChange needed to update the displayfpmCommand
BO108BLANK DSPLYBlank the operator display panelCommand0=OFF, 1=ON
BO109LAMP TESTTest the display lampsCommand0=OFF, 1=ON
BO110ENG UNITSDisplay in English or SI unitsCommand0=ENG, 1=SI
AO118TABLE VOLTSVoltage value of the selected valve table pointVCommand
AO119TABLE FLOWAirflow value of the selected valve table pointcfmCommand
AO120V TABLE PTSelects a valve table point to view or editCommand
AO121HI LIMITFeedback loop high limit (not described in the guide)Command
AO122LO LIMITFeedback loop low limit (not described in the guide)Command
BO123EMER DI6Remote emergency purge input on DI 6Command0=OFF, 1=ON
BO124OPEN LOOPActuator runs open loop (no sensor)Command0=NO, 1=YES
AO126AVE FACE VELAveraged face velocity shown on the displayfpmCommand
BO127PPCL STATEPPCL program loaded or emptyCommand0=EMPTY, 1=LOADED
Object ID lookup: Siemens Fume Hood Controller 6742 point IDs by name

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)

How many BACnet points does the Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) have?

This list has 106 BACnet objects: 6 analog inputs, 66 analog outputs, 2 binary inputs, 32 binary outputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) BACnet points are writable?

98 of the 106 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done. The source has no read/write column, so this is inferred from object type.

Where is the official Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve) BACnet documentation?

The source is BACnet Programmable Fume Hood Controller Vertical Sash Configuration with Damper or Venturi Valve, Application 6741 and Application 6742, Application Note (140-1344), revision 2015-11-09, published free by Siemens at https://sid.siemens.com/api/khub/documents/jZXTMijdgHr2UijYRScCYw/content.

What are the minimum BACnet points to integrate the Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)?

Start with BO 20 OCC.UNOCC (OCC = occupied face velocity setpoint in use); AO 84 OCC FV STPT (Occupied face velocity setpoint, fpm); AO 85 UNOC FV STPT (Unoccupied face velocity setpoint, fpm); AO 4 FACE VEL (Calculated face velocity, fpm); AI 31 EXH VOL (Measured hood exhaust airflow, cfm); AO 54 FACE AREA (Sash open area, ft²); BO 5 LOW ALM (Low flow alarm); BO 6 HIGH ALM (High flow alarm); BO 7 EMER ALM (Emergency purge alarm); BO 8 GEN FAILURE (General failure (sensor or hardware)).

How do I enable BMS control of the Siemens BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)?

No enable point: the controller runs its sequence once STARTUP MODE (AO 21) is 0. OCC.UNOCC (BO 20) picks the occupied or unoccupied face velocity setpoint; the guide drives it from DI 2.

How do I check these points on the real BACnet Programmable Fume Hood Controller - Application 6742 (Vertical Sash with Venturi Valve)?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Siemens BACnet points lists

Source: BACnet Programmable Fume Hood Controller Vertical Sash Configuration with Damper or Venturi Valve, Application 6741 and Application 6742, Application Note · 140-1344 · rev. 2015-11-09. Object names, instances and units are reproduced as published; descriptions are our own.