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VAV compact controller (damper drive with flow sensor) · BACnet points list

Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) BACnet points list

Updated 12 November 2026

Short answer

The G..B181.1E/BA is a VAV damper actuator with a built-in differential pressure sensor and controller that runs on BACnet MS/TP. The BMS writes a 0-100 % setpoint (relative volume flow in VAV mode, position in Pos mode) and reads actual flow, position and pressure. All VAV, backup and bus settings are BACnet objects too.

This page lists 41 BACnet objects for the Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) — 23 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
OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)
Equipment
VAV compact controller (damper drive with flow sensor)
Equipment type
VAV boxes & fan coils
BACnet objects
41 (23 writable)
Transport
BACnet MS/TP
Firmware
Not stated
Also known as
GDB181.1E/BA, GLB181.1E/BA, G..B181.1E/BA, GDB181, GLB181, S55499-D506, S55499-D168, S55499-D169
Source document
VAV Compact Controller BACnet MS/TP G..B181.1E/BA - Basic Documentation · A6V10695831 · rev. 2021-12-20
Download CSV 41 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 OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)

Integration in brief

Set OperatingMode (MV 3) to VAV and write the volume flow setpoint, 0-100 % of the Vmin-Vmax range, to AO 0. Read AI 1/AI 2 for actual flow and AI 0 for position. Set BackupMode and BackupTimeout so the box goes to a safe position if the BMS stops talking.

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 0SetpointFlow setpoint (VAV) or position (Pos), 0-100 %Command
AI 1ActualFlow RelativeActual flow, % of VmaxRead
AI 2ActualFlow AbsoluteActual flow, m³/hRead
AI 0ActualPositionDamper position, %Read
BI 1BackupMode EnteredBackup mode entered (communication lost)Read
BI 2Device JammedActuator jammedRead

Enable & remote start

MV 3 OperatingMode selects VAV (flow control) or Pos (position control); AO 0 is read in that mode's meaning.

Heartbeat & communication loss

With BackupMode (MV 5) set to Backup Position or Keep Still, the actuator enters backup mode when no communication arrives within BackupTimeout (PIV 0, default 900 s); BI 1 shows it. Backup is disabled by default.

Network setup

Watch out for

Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) 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.

41 of 41 shown
Type
Other
Access
Show
Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) BACnet Points List
DescriptionStates
AOmin0SetpointVolume flow (VAV) or position setpoint, 0-100 %%Command
AImin0ActualPositionActuator position, 0-100 %%Read
AImin1ActualFlow RelativeActual volume flow, % of Vmax%Read
AImin2ActualFlow AbsoluteActual volume flow, 0-60,000m³/hRead
AI3ActualPressureMeasured differential pressure, 0-500PaRead
MV0OverrideControlRemote override commandWrite1=Off, 2=Open, 3=Close, 4=Stop, 5=GoToMin, 6=GoToMax
MV1ActCommandActuator commandWrite1=Ready, 2=Reserved, 3=Selftest, 4=ReInitDevice, 5=RemoteReset
MV2DirectionOpening directionWrite1=CW, 2=CCW
MV3OperatingModeControl modeWrite1=VAV, 2=Pos
MV4AdaptiveModePosition range modeWrite1=Absolute, 2=Adaptive
MV5BackupModeAction on loss of communicationWrite1=Backup Position, 2=Keep Still, 3=Disabled
AV0BackupPositionBackup position, 0-100 %, default 0%Write
PIV0BackupTimeoutCommunication timeout before backup mode, default 900sWrite
AV1MinPositionMinimum position, default 0 %%Write
AV2MaxPositionMaximum position, default 100 %%Write
AV3VnValueVn value (flow factor), 0.77-3.16, default 1.00Write
AV4VnomNominal volume flow of the box, default 100m³/hWrite
AV5VminScaleVmin, -20 to 100 % of Vnom, default 0%Write
AV6VmaxScaleVmax, 0-120 % of Vnom, default 100%Write
PIV1AltitudeLevelElevation above sea level, default 500mWrite
PIV2RunTime ActuatorActuator running time, 150 ssRead
MV6UnitSwitchFlow unitWrite1=m3/h, 2=l/s
PIV3MSTP -AddressMS/TP MAC address, 0-128, default 1Write
PIV4DevObj-ID-BaseDevice object ID base, default 10000Write
PIV5MaxMasterMax Master, 1-127, default 127Write
MV7BaudrateMS/TP baud rateWrite1=auto, 2=9600, 3=19200, 4=38400, 5=57600, 6=76800, 7=115200
BV0BusTerminationBuilt-in bus terminationWrite0=Off, 1=On
MV8Bus Config. CommandApply or discard new bus settingsWrite1=Ready, 2=Load, 3=Discard
BI0LocalOverrideLocal override activeRead0=inactive, 1=active
BImin1BackupMode EnteredBackup mode active (communication lost)Read0=inactive, 1=active
BImin2Device JammedActuator jammedRead0=inactive, 1=active
BI3NominalLife-timeExceededNominal lifetime exceededRead0=inactive, 1=active
BI4Invalid ConfigurationInvalid configurationRead0=inactive, 1=active
MI0Pressure SensorStatePressure sensor stateRead1=No error, 2=Connection fault, 3=Comm. fault
MI1SelftestStatusSelf-test resultRead1=Not tested, 2=Selftest failed, 3=Selftest passed
MI2AdaptionStateAdaptation stateRead1=Adaption not done, 2=Adaption done, 3=Adaption in progress
PIV6Cumulated UptimeTotal powered timesRead
PIV7Cumulated Running TimeTotal motor running timesRead
PIV8Counter RepositioningRepositioning countRead
PIV9CounterPower UpPower-up countRead
PIV10CounterDevice JamJam countRead
Object ID lookup: Siemens G..B181.1E/BA 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 OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) 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 OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)

How many BACnet points does the Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) have?

This list has 41 BACnet objects: 4 analog inputs, 1 analog output, 7 analog values, 5 binary inputs, 1 binary value, 3 multi-state inputs, 9 multi-state values, 11 positive integer values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) BACnet points are writable?

23 of the 41 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 OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) BACnet documentation?

The source is VAV Compact Controller BACnet MS/TP G..B181.1E/BA - Basic Documentation (A6V10695831), revision 2021-12-20, published free by Siemens at https://sid.siemens.com/r/A6V10695831.

What are the minimum BACnet points to integrate the Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)?

Start with AO 0 Setpoint (Flow setpoint (VAV) or position (Pos), 0-100 %); AI 1 ActualFlow Relative (Actual flow, % of Vmax); AI 2 ActualFlow Absolute (Actual flow, m³/h); AI 0 ActualPosition (Damper position, %); BI 1 BackupMode Entered (Backup mode entered (communication lost)); BI 2 Device Jammed (Actuator jammed).

How do I enable BMS control of the Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)?

MV 3 OperatingMode selects VAV (flow control) or Pos (position control); AO 0 is read in that mode's meaning.

Does the Siemens OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA) need a BACnet heartbeat or have a communication timeout?

With BackupMode (MV 5) set to Backup Position or Keep Still, the actuator enters backup mode when no communication arrives within BackupTimeout (PIV 0, default 900 s); BI 1 shows it. Backup is disabled by default.

How do I check these points on the real OpenAir G..B181.1E/BA VAV compact controller (GDB181.1E/BA, GLB181.1E/BA)?

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: VAV Compact Controller BACnet MS/TP G..B181.1E/BA - Basic Documentation · A6V10695831 · rev. 2021-12-20. Object names, instances and units are reproduced as published; descriptions are our own.