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Fan-powered VAV terminal unit controller · BACnet points list

Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) BACnet points list

Updated 6 November 2026

Short answer

Application 6657 runs a series fan-powered VAV box whose fan speed is set by a 0-10 V signal (FAN AOV1), with up to three stages of electric heat and optional baseboard radiation, on a Siemens BACnet PTEC controller over BACnet MS/TP. Instead of DAY.NGT it uses an analog MODE point: 0 shutdown, 10 unoccupied, 20 demand reduction, 30 standby, 60 occupied. Fan airflow follows tables picked by BOX SIZE, and each heat stage needs a set fan airflow before it starts.

This page lists 110 BACnet objects for the Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) — 96 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 PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)
Equipment
Fan-powered VAV terminal unit controller
Equipment type
VAV boxes & fan coils
BACnet objects
110 (96 writable)
Transport
BACnet MS/TP
Firmware
Newer than revision Bx40
Also known as
PTEC 6657, Application 6657, App 6657, 550-492PA, Siemens ECM series fan VAV, variable speed series fan VAV
Source document
BACnet PTEC Controller VAV 0 to 10V Series Fan and 3-Stage Electric Heat, Application 6657, Application Note · 140-1158 · rev. 2016-11-18
Download CSV 110 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 PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)

Integration in brief

Address the controller on the BACnet MS/TP trunk (manually or with auto addressing). The BMS sets the operating mode with MODE (AO 3), writes the occupied setpoints and VAV AHU (BO 61), and reads room temperature, primary airflow, fan airflow, heat stage status and the flow temperature alarm.

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
AO 3MODEMode: 0 off, 10 unocc, 20 EDR, 30 standby, 60 occCommand
AO 6OCC CLG STPTOccupied cooling setpoint, °FCommand
AO 7OCC HTG STPTOccupied heating setpoint, °FCommand
BO 61VAV AHUAir handler running; written by the field panelCommand
BO 5HEAT.COOLCurrent mode: HEAT or COOLCommand
AI 4ROOM TEMPSpace temperatureRead
AI 35AIR VOLUMEMeasured primary airflow, cfmRead
AO 33FAN FLOWSeries fan airflow command, cfmCommand
BO 43HEAT STAGE 1Electric heat stage 1 on/offCommand
BO 62FLOW TEMPSupply air not cooling the roomCommand

Enable & remote start

Occupancy and operating mode come from MODE (AO 3), not DAY.NGT: 0 = shutdown, 10 = unoccupied, 20 = electrical demand reduction, 30 = standby, 60 = occupied. UNOCC OVRD (BO 21) shows a temporary occupied override from the room unit button.

Sensors & values from the BMS

VAV AHU (BO 61) must be commanded by the field panel (PPCL) to tell the box whether the central air handler is on; the application only reads it. VENT DMD MIN (AO 107) sets the occupied ventilation minimum airflow.

Network setup

Watch out for

Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) 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.

110 of 110 shown
Type
Access
Show
Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) BACnet Points List
DescriptionStates
AO1CTLR ADDRESSController MS/TP addressCommand
AO2APPLICATIONApplication number running in the controllerCommand
AOmin3MODEOperating mode code (0, 10, 20, 30 or 60)Command
AImin4ROOM TEMPRoom temperature from the room unit°FRead
BOmin5HEAT.COOLCurrent heating/cooling modeCommand0=COOL, 1=HEAT
AOmin6OCC CLG STPTOccupied cooling setpoint°FCommand
AOmin7OCC HTG STPTOccupied heating setpoint°FCommand
AO8UOC CLG STPTUnoccupied cooling setpoint°FCommand
AO9UOC HTG STPTUnoccupied heating setpoint°FCommand
BI10DI 5Digital input 5Read0=OFF, 1=ON
AO11RM STPT MINLowest setpoint allowed from the room unit°FCommand
AO12RM STPT MAXHighest setpoint allowed from the room unit°FCommand
AI13RM STPT DIALSetpoint from the room unit dial or keypad°FRead
BO14STPT DIALUse the room unit setpoint dialCommand0=NO, 1=YES
AI15AI 3Spare analog input 3%Read
BO16FAN MODESeries fan CONST (fixed) or VARI (variable) in occupied modeCommand0=VARI, 1=CONST
AO17FLOW ENDHeating loop % where airflow reaches maximum%Command
BO18WALL SWITCHWall switch connected to DI 2Command0=NO, 1=YES
BI19DI OVRD SWRoom unit night override buttonRead0=OFF, 1=ON
AO20OVRD TIMENight override durationhCommand
BO21UNOCC OVRDUnoccupied override statusCommand0=OCC, 1=UNOCC
AO22FLOW 2 STARTHeating loop % where the second fan ramp starts%Command
AO23FLOW 1 ENDHeating loop % where the first fan ramp ends%Command
BI24DI 2Digital input 2Read0=OFF, 1=ON
BI25DI 3Digital input 3Read0=OFF, 1=ON
AO26ALARM TIMEDelay before a warning or alarm is setminCommand
AO27STG 1 TIMEStage 1 on time before stage 2 may startsCommand
AO28STG 2 TIMEStage 2 time used for stagingsCommand
AO30LOW FLOWAirflow shortfall used by the flow alarm%Command
AO31BOX SIZEBox size or custom fan table selectCommand
AO32CLG FLOW MAXMaximum airflow in coolingcfmCommand
AOmin33FAN FLOWFan airflow commandcfmCommand
AO34HTG FLOW MAXMaximum airflow in heatingcfmCommand
AImin35AIR VOLUMEMeasured airflowcfmRead
AO36FLOW COEFFAirflow pickup correction coefficientCommand
AO37FLO LO VOLTSFan signal voltage for FLO LOVCommand
AO38FLO HI VOLTSFan signal voltage for FLO HIVCommand
AO39FLO LOLowest airflow the fan can producecfmCommand
BI40DI 4Digital input 4Read0=OFF, 1=ON
BO41DO 1Digital output 1Command0=OFF, 1=ON
BO42DO 2Digital output 2Command0=OFF, 1=ON
BOmin43HEAT STAGE 1Electric heat stage 1 outputCommand0=OFF, 1=ON
BO44HEAT STAGE 2Electric heat stage 2 outputCommand0=OFF, 1=ON
BO45HEAT STAGE 3Electric heat stage 3 outputCommand0=OFF, 1=ON
BO46BASE DO6Baseboard radiation output on DO 6Command0=OFF, 1=ON
BI47DI 6Digital input 6Read0=OFF, 1=ON
AO48DMPR COMDDamper position command%Command
AO49DMPR POSDamper position (calculated)%Command
AI50AUX TEMPAuxiliary temperature input°FRead
AO51MTR1 TIMINGMotor 1 full-stroke timesCommand
AO52FLOW 2 ENDHeating loop % where the second fan ramp ends%Command
AO53FLOW 3 STARTHeating loop % where the third fan ramp starts%Command
AI54AI 5Spare analog input 5°FRead
AO55FAN FLO MOREFan airflow step for the third heat stagecfmCommand
AO56DMPR ROT ANGDamper rotation angleCommand
AO57STG 3 TIMEStage 3 time used for stagingsCommand
AO58MTR SETUPMotor enable/reverse setup (additive code)Command
AO59DO DIR. REVDigital output direction reverse (additive code)Command
BO60WARMUPMorning warm-up activeCommand0=OFF, 1=ON
BOmin61VAV AHUAir handler running (set from the field panel)Command0=OFF, 1=ON
BOmin62FLOW TEMPSupply air not cooling the room alarmCommand0=NORMAL, 1=ALARM
AO63CLG P GAINCooling loop proportional gainCommand
AO64CLG I GAINCooling loop integral gainCommand
AO65TEMP LLIMITUnoccupied low room temperature limit°FCommand
AO66FAN AOV1Fan speed signal on AO 1VCommand
AO67HTG P GAINHeating loop proportional gainCommand
AO68HTG I GAINHeating loop integral gainCommand
AO69TEMP HLIMITUnoccupied high room temperature limit°FCommand
AO70AOV 2Analog output 2 (0-10 V)VCommand
AO71FAN TIMETime for the fan to ramp from minimum to maximumsCommand
AO72FLOW I GAINFlow loop integral gainCommand
AO73HTG DBANDHeating deadband for baseboard radiation°FCommand
AO74MORN DBANDMorning warm-up / cool-down deadband°FCommand
AO75FLOWAirflow as percent of maximum%Command
AO76CTL FLOW MINActive minimum airflowcfmCommand
AO77CTL FLOW MAXActive maximum airflowcfmCommand
AO78CTL TEMPTemperature the controller is controlling to°FCommand
AO79CLG LOOPOUTCooling loop output%Command
AO80HTG LOOPOUTHeating loop output%Command
AO81AVG HEAT OUTAverage auxiliary heat output%Command
AO82FAN FLOW MINFan airflow minimumcfmCommand
AO83FAN FLOW MIDFan airflow mid pointcfmCommand
AO84FAN FLO HMAXFan airflow maximum in heatingcfmCommand
AO85FAN FLO CMAXFan airflow maximum in coolingcfmCommand
AO86SWITCH TIMEMinimum time before heat/cool switchoverminCommand
AO87FLO HIHighest airflow the fan can producecfmCommand
AO88STAGE COUNTNumber of electric heat stagesCommand
AO89STAGE TIMEElectric heat cycle timeminCommand
AO90SWITCH DBANDTemperature deadband for heat/cool switchover°FCommand
AO91AOV 3Analog output 3 (0-10 V)VCommand
AO92CTL STPTActive control setpoint°FCommand
AO93FLOW STPTAirflow setpoint, percent%Command
BO94CAL AIRStart air velocity sensor calibrationCommand0=NO, 1=YES
AO95CAL SETUPCalibration setup codeCommand
AO96CAL TIMERHours between automatic calibrationshCommand
AO97DUCT AREAInlet duct area for airflow calculationft²Command
AO98LOOP TIMEControl loop intervalsCommand
AO99ERROR STATUSController error status codeCommand
AO102RMTMP OFFSETRoom temperature calibration offset°FCommand
BO103DO 7Digital output 7Command0=OFF, 1=ON
BO104DO 8Digital output 8Command0=OFF, 1=ON
AO106NGT FLOW MINMinimum airflow at nightcfmCommand
AO107VENT DMD MINVentilation demand minimum airflowcfmCommand
AO109CLG FLOW MINMinimum airflow in coolingcfmCommand
AO110STPT SPANRoom unit setpoint adjustment span°FCommand
AO121DEW POINTRoom dew point°FCommand
AO124SENSOR SELRoom unit / sensor select code (additive)Command
AI125RM CO2Room CO2ppmRead
AI126RM RHRoom relative humidity%Read
BO127PPCL STATEPPCL program loaded or emptyCommand0=EMPTY, 1=LOADED
Object ID lookup: Siemens PTEC 0-10 V Series Fan VAV 6657 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 PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) 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 PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)

How many BACnet points does the Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) have?

This list has 110 BACnet objects: 8 analog inputs, 78 analog outputs, 6 binary inputs, 18 binary outputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) BACnet points are writable?

96 of the 110 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 PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat) BACnet documentation?

The source is BACnet PTEC Controller VAV 0 to 10V Series Fan and 3-Stage Electric Heat, Application 6657, Application Note (140-1158), revision 2016-11-18, published free by Siemens at https://sid.siemens.com/api/khub/documents/ZGXr6lxf8pBzb_NlatPUDg/content.

What are the minimum BACnet points to integrate the Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)?

Start with AO 3 MODE (Mode: 0 off, 10 unocc, 20 EDR, 30 standby, 60 occ); AO 6 OCC CLG STPT (Occupied cooling setpoint, °F); AO 7 OCC HTG STPT (Occupied heating setpoint, °F); BO 61 VAV AHU (Air handler running; written by the field panel); BO 5 HEAT.COOL (Current mode: HEAT or COOL); AI 4 ROOM TEMP (Space temperature); AI 35 AIR VOLUME (Measured primary airflow, cfm); AO 33 FAN FLOW (Series fan airflow command, cfm); BO 43 HEAT STAGE 1 (Electric heat stage 1 on/off); BO 62 FLOW TEMP (Supply air not cooling the room).

How do I enable BMS control of the Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)?

Occupancy and operating mode come from MODE (AO 3), not DAY.NGT: 0 = shutdown, 10 = unoccupied, 20 = electrical demand reduction, 30 = standby, 60 = occupied. UNOCC OVRD (BO 21) shows a temporary occupied override from the room unit button.

Can the BMS supply sensor values to the Siemens BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)?

VAV AHU (BO 61) must be commanded by the field panel (PPCL) to tell the box whether the central air handler is on; the application only reads it. VENT DMD MIN (AO 107) sets the occupied ventilation minimum airflow.

How do I check these points on the real BACnet PTEC VAV Controller - Application 6657 (VAV 0-10 V Series Fan and 3-Stage Electric Heat)?

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 PTEC Controller VAV 0 to 10V Series Fan and 3-Stage Electric Heat, Application 6657, Application Note · 140-1158 · rev. 2016-11-18. Object names, instances and units are reproduced as published; descriptions are our own.