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VAV terminal unit controller · BACnet points list

Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) BACnet points list

Updated 28 October 2026

Short answer

Application 6680 runs a single-duct VAV box on a Siemens BACnet PTEC controller over BACnet MS/TP. It modulates the supply damper for cooling and one or two modulating heating devices (0-10 V or floating) for heating, with airflow and heat sequenced in series, parallel or overlapping. It can also monitor room CO2 and a supply air temperature; HC.ENDIS sets heating only, cooling only or auto changeover.

This page lists 103 BACnet objects for the Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) — 89 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 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)
Equipment
VAV terminal unit controller
Equipment type
VAV boxes & fan coils
BACnet objects
103 (89 writable)
Transport
BACnet MS/TP
Firmware
Newer than revision Bx40
Also known as
PTEC 6680, Application 6680, App 6680, 550-499PA, Siemens VAV CO2 monitoring
Source document
BACnet PTEC Controller VAV with CO2 Monitoring and AOV or Floating Point Heating, Application 6680, Application Note · 140-1154 · rev. 2014-07-17
Download CSV 103 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)

Integration in brief

Address the controller on the BACnet MS/TP trunk (manually or with auto addressing), then release the box to application control. The BMS commands occupancy with DAY.NGT (BO 29) and the day setpoints, and reads room temperature, airflow, damper and heating device position, room CO2 and the error status.

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 29DAY.NGTDAY = occupied, NIGHT = unoccupiedCommand
AO 6DAY CLG STPTOccupied cooling setpoint, °FCommand
AO 7DAY HTG STPTOccupied heating setpoint, °FCommand
BO 5HEAT.COOLCurrent mode: HEAT or COOLCommand
AI 4ROOM TEMPSpace temperatureRead
AI 35AIR VOLUMEMeasured box airflow, cfmRead
AO 49DMPR POSDamper position, %Command
AO 101MODHTG1 POSHeating device 1 position, %Command
AI 3RM CO2Room CO2, ppmRead
AO 99ERROR STATUSController error codeCommand

Enable & remote start

Occupancy is DAY.NGT (BO 29). With a wall switch on DI 2 and WALL SWITCH (BO 18) = YES, the switch sets it; standalone with no switch the controller stays in day mode; on a network the field panel or BMS commands DAY.NGT. NGT OVRD (BO 21) shows a temporary night override from the room unit button.

Sensors & values from the BMS

VENT DMD MIN (AO 123) can be reset by the field panel (IAQ/DCV programs) or PPCL to raise the occupied minimum airflow. Switchover on supply air temperature needs PPCL to command HEAT.COOL (BO 5).

Network setup

Watch out for

Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) 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.

103 of 103 shown
Type
Access
Show
Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) BACnet Points List
DescriptionStates
AO1CTLR ADDRESSController MS/TP addressCommand
AO2APPLICATIONApplication number running in the controllerCommand
AImin3RM CO2Room CO2ppmRead
AImin4ROOM TEMPRoom temperature from the room unit°FRead
BOmin5HEAT.COOLCurrent heating/cooling modeCommand0=COOL, 1=HEAT
AOmin6DAY CLG STPTDay (occupied) cooling setpoint°FCommand
AOmin7DAY HTG STPTDay (occupied) heating setpoint°FCommand
AO8NGT CLG STPTNight (unoccupied) cooling setpoint°FCommand
AO9NGT HTG STPTNight (unoccupied) heating setpoint°FCommand
AO10CO2 SCALECO2 sensor scaling (ppm at full scale)ppmCommand
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
AO16FLOW STARTHeating loop % where airflow starts to rise%Command
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
BO21NGT OVRDNight override statusCommand0=DAY, 1=NIGHT
AO22REHEAT STARTHeating loop % where reheat starts%Command
AO23REHEAT ENDHeating loop % where reheat is at full output%Command
BI24DI 2Digital input 2Read0=OFF, 1=ON
BI25DI 3Digital input 3Read0=OFF, 1=ON
BI26DI 4Digital input 4Read0=OFF, 1=ON
BI27DI 5Digital input 5Read0=OFF, 1=ON
BI28DI 6Digital input 6Read0=OFF, 1=ON
BOmin29DAY.NGTDay/night (occupancy) modeCommand0=DAY, 1=NIGHT
AO31CLG FLOW MINMinimum airflow in coolingcfmCommand
AO32CLG FLOW MAXMaximum airflow in coolingcfmCommand
AO33HTG FLOW MINMinimum airflow in heatingcfmCommand
AO34HTG FLOW MAXMaximum airflow in heatingcfmCommand
AImin35AIR VOLUMEMeasured airflowcfmRead
AO36FLOW COEFFAirflow pickup correction coefficientCommand
AO37MODHTG2 COMDModulating heat 2 command%Command
AO38AOV2Analog output 2 (0-10 V)VCommand
AO39AOV2 OPENAOV2 voltage at openVCommand
AO40AOV2 CLOSEAOV2 voltage at closedVCommand
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
BO46DO 6Digital output 6Command0=OFF, 1=ON
AI47AUX TEMP AI4Auxiliary temperature input on AI 4°FRead
AO48DMPR COMDDamper position command%Command
AOmin49DMPR POSDamper position (calculated)%Command
AO51MTR1 TIMINGMotor 1 full-stroke timesCommand
AO52MODHTG1 COMDModulating heat 1 command%Command
AO54AOV3Analog output 3 (0-10 V)VCommand
AO56DMPR ROT ANGDamper rotation angleCommand
AO58MTR SETUPMotor enable/reverse setup (additive code)Command
AO59DO DIR. REVDigital output direction reverse (additive code)Command
AO60AOV1Analog output 1 (0-10 V)VCommand
AO61AOV1 OPENAOV1 voltage at openVCommand
AO62AOV1 CLOSEAOV1 voltage at closedVCommand
AO63CLG P GAINCooling loop proportional gainCommand
AO64CLG I GAINCooling loop integral gainCommand
AO65CLG D GAINCooling loop derivative gainCommand
AO66TEMP OFFSETRoom temperature calibration offset°FCommand
AO67HTG P GAINHeating loop proportional gainCommand
AO68HTG I GAINHeating loop integral gainCommand
AO69HTG D GAINHeating loop derivative gainCommand
AO72FLOW I GAINFlow loop integral gainCommand
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
BO81DO 7Digital output 7Command0=OFF, 1=ON
AI82AUX TEMP AI5Auxiliary temperature input on AI 5°FRead
AO85SWITCH LIMITLoop output below which mode may switch%Command
AO86SWITCH TIMEMinimum time before heat/cool switchoverminCommand
BO87CAL MODULECalibration module installedCommand0=NO, 1=YES
AO88MODHTG COUNTNumber of modulating heating devicesCommand
BO89DO 8Digital output 8Command0=OFF, 1=ON
AO90SWITCH DBANDTemperature deadband for heat/cool switchover°FCommand
AO91HC.ENDISHeat/cool enable: 1 heat, 2 cool, 3 bothCommand
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
AOmin99ERROR STATUSController error status codeCommand
AOmin101MODHTG1 POSModulating heat 1 position%Command
AO102MTR2 TIMINGMotor 2 full-stroke timesCommand
AO103MHTG1 ROTANGModulating heat actuator 1 rotation angleCommand
AO104MODHTG2 POSModulating heat 2 position%Command
AO105MTR3 TIMINGMotor 3 full-stroke timesCommand
AO106MHTG2 ROTANGModulating heat actuator 2 rotation angleCommand
AO107MODHTG FLOWAirflow % needed before heating is enabled%Command
AO113CO2 CONFIGCO2 sensor source select codeCommand
AO120DEW POINTRoom dew point°FCommand
AO121STPT SPANRoom unit setpoint adjustment span°FCommand
AO122NGT FLOW MINMinimum airflow at nightcfmCommand
AO123VENT DMD MINVentilation demand minimum airflowcfmCommand
BO124PPCL STATEPPCL program loaded or emptyCommand0=EMPTY, 1=LOADED
AO126SENSOR SELRoom unit / sensor select code (additive)Command
AI127RM RHRoom relative humidity%Read

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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) 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 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)

How many BACnet points does the Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) have?

This list has 103 BACnet objects: 8 analog inputs, 73 analog outputs, 6 binary inputs, 16 binary outputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) BACnet points are writable?

89 of the 103 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 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat) BACnet documentation?

The source is BACnet PTEC Controller VAV with CO2 Monitoring and AOV or Floating Point Heating, Application 6680, Application Note (140-1154), revision 2014-07-17, published free by Siemens at https://sid.siemens.com/api/khub/documents/sBKap71mqEhMpYTbfYEmCg/content.

What are the minimum BACnet points to integrate the Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)?

Start with BO 29 DAY.NGT (DAY = occupied, NIGHT = unoccupied); AO 6 DAY CLG STPT (Occupied cooling setpoint, °F); AO 7 DAY HTG STPT (Occupied heating setpoint, °F); BO 5 HEAT.COOL (Current mode: HEAT or COOL); AI 4 ROOM TEMP (Space temperature); AI 35 AIR VOLUME (Measured box airflow, cfm); AO 49 DMPR POS (Damper position, %); AO 101 MODHTG1 POS (Heating device 1 position, %); AI 3 RM CO2 (Room CO2, ppm); AO 99 ERROR STATUS (Controller error code).

How do I enable BMS control of the Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)?

Occupancy is DAY.NGT (BO 29). With a wall switch on DI 2 and WALL SWITCH (BO 18) = YES, the switch sets it; standalone with no switch the controller stays in day mode; on a network the field panel or BMS commands DAY.NGT. NGT OVRD (BO 21) shows a temporary night override from the room unit button.

Can the BMS supply sensor values to the Siemens BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)?

VENT DMD MIN (AO 123) can be reset by the field panel (IAQ/DCV programs) or PPCL to raise the occupied minimum airflow. Switchover on supply air temperature needs PPCL to command HEAT.COOL (BO 5).

How do I check these points on the real BACnet PTEC VAV Controller - Application 6680 (VAV with CO2 Monitoring, AOV or Floating Reheat)?

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 with CO2 Monitoring and AOV or Floating Point Heating, Application 6680, Application Note · 140-1154 · rev. 2014-07-17. Object names, instances and units are reproduced as published; descriptions are our own.