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VAV terminal unit controller · BACnet points list

Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) BACnet points list

Updated 28 October 2026

Short answer

Application 6600 runs a cooling-only single-duct VAV box on a Siemens BACnet PTEC controller over BACnet MS/TP. The cooling loop resets the airflow setpoint between the cooling minimum and maximum, and the flow loop modulates the supply air damper to hold it. The air handler has to supply cool air; there is no heating sequence.

This page lists 79 BACnet objects for the Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) — 64 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 6600 (VAV Cooling Only)
Equipment
VAV terminal unit controller
Equipment type
VAV boxes & fan coils
BACnet objects
79 (64 writable)
Transport
BACnet MS/TP
Firmware
Newer than revision Bx40
Also known as
PTEC 6600, Application 6600, App 6600, 550-495PA, Siemens VAV cooling only
Source document
BACnet PTEC Controller Terminal Box (VAV) - Cooling Only, Application 6600, Application Note · 140-1161 · rev. 2014-10-27
Download CSV 79 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 6600 (VAV Cooling Only)

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 cooling setpoint, and reads room temperature, airflow, damper position 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
AI 4ROOM TEMPSpace temperatureRead
AI 35AIR VOLUMEMeasured box airflow, cfmRead
AO 49DMPR POSDamper position, %Command
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 105) is a ventilation minimum airflow; in day mode the controller uses the larger of it and CLG FLOW MIN as the active minimum.

Network setup

Watch out for

Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) 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.

79 of 79 shown
Type
Access
Show
Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) BACnet Points List
DescriptionStates
AO1CTLR ADDRESSController MS/TP addressCommand
AO2APPLICATIONApplication number running in the controllerCommand
AO3RMTMP OFFSETRoom temperature calibration offset°FCommand
AImin4ROOM TEMPRoom temperature from the room unit°FRead
AOmin6DAY CLG STPTDay (occupied) cooling setpoint°FCommand
AO8NGT CLG STPTNight (unoccupied) cooling setpoint°FCommand
BI10DI 6Digital input 6Read0=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
AI15AUX TEMP AI5Auxiliary temperature input on AI 5°FRead
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
BI24DI 2Digital input 2Read0=OFF, 1=ON
BI25DI 5Digital input 5Read0=OFF, 1=ON
BOmin29DAY.NGTDay/night (occupancy) modeCommand0=DAY, 1=NIGHT
AO31CLG FLOW MINMinimum airflow in coolingcfmCommand
AO32CLG FLOW MAXMaximum airflow in coolingcfmCommand
AImin35AIR VOLUMEMeasured airflowcfmRead
AO36FLOW COEFFAirflow pickup correction coefficientCommand
AO37MTR3 COMDMotor 3 position command%Command
AO38MTR3 POSMotor 3 position (calculated)%Command
AO39MTR3 TIMINGMotor 3 full-stroke timesCommand
BI40DI 4Digital input 4Read0=OFF, 1=ON
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
BI47DI 3Digital input 3Read0=OFF, 1=ON
AO48DMPR COMDDamper position command%Command
AOmin49DMPR POSDamper position (calculated)%Command
AI50AI 4Spare analog input 4°FRead
AO51MTR1 TIMINGMotor 1 full-stroke timesCommand
AO52MTR2 COMDMotor 2 position command%Command
AO53MTR2 POSMotor 2 position (calculated)%Command
AI54AI3Spare analog input 3%Read
AO55MTR2 TIMINGMotor 2 full-stroke timesCommand
AO56DMPR ROT ANGDamper rotation angleCommand
AO58MTR SETUPMotor enable/reverse setup (additive code)Command
AO59DO DIR. REVDigital output direction reverse (additive code)Command
AO63CLG P GAINCooling loop proportional gainCommand
AO64CLG I GAINCooling loop integral gainCommand
AO65CLG D GAINCooling loop derivative gainCommand
AO66AOV 1Analog output 1 (0-10 V)VCommand
AO70AOV 2Analog output 2 (0-10 V)VCommand
AO71FLOW P GAINFlow loop proportional gainCommand
AO72FLOW I GAINFlow loop integral gainCommand
AO73FLOW D GAINFlow loop derivative gainCommand
AO74FLOW BIASFlow loop bias%Command
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
BO87CAL MODULECalibration module installedCommand0=NO, 1=YES
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
AOmin99ERROR STATUSController error status codeCommand
BO102DO 7Digital output 7Command0=OFF, 1=ON
BO103DO 8Digital output 8Command0=OFF, 1=ON
AO104NGT FLOW MINMinimum airflow at nightcfmCommand
AO105VENT DMD MINVentilation demand minimum airflowcfmCommand
AO106STPT SPANRoom unit setpoint adjustment span°FCommand
AI121DEW POINTRoom dew point°FRead
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

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 6600 (VAV Cooling Only) 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 6600 (VAV Cooling Only)

How many BACnet points does the Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) have?

This list has 79 BACnet objects: 9 analog inputs, 49 analog outputs, 6 binary inputs, 15 binary outputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only) BACnet points are writable?

64 of the 79 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 6600 (VAV Cooling Only) BACnet documentation?

The source is BACnet PTEC Controller Terminal Box (VAV) - Cooling Only, Application 6600, Application Note (140-1161), revision 2014-10-27, published free by Siemens at https://sid.siemens.com/api/khub/documents/YP5_S7nt6mBKv8uyYgXd1w/content.

What are the minimum BACnet points to integrate the Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only)?

Start with BO 29 DAY.NGT (DAY = occupied, NIGHT = unoccupied); AO 6 DAY CLG STPT (Occupied cooling setpoint, °F); AI 4 ROOM TEMP (Space temperature); AI 35 AIR VOLUME (Measured box airflow, cfm); AO 49 DMPR POS (Damper position, %); AO 99 ERROR STATUS (Controller error code).

How do I enable BMS control of the Siemens BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only)?

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 6600 (VAV Cooling Only)?

VENT DMD MIN (AO 105) is a ventilation minimum airflow; in day mode the controller uses the larger of it and CLG FLOW MIN as the active minimum.

How do I check these points on the real BACnet PTEC VAV Controller - Application 6600 (VAV Cooling Only)?

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 Terminal Box (VAV) - Cooling Only, Application 6600, Application Note · 140-1161 · rev. 2014-10-27. Object names, instances and units are reproduced as published; descriptions are our own.