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Butterfly valve actuator · BACnet points list
Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) BACnet points list
Updated 28 October 2026
The PR..-BAC-.. is a Belimo rotary actuator for butterfly valves with BACnet MS/TP on board. The BMS writes a % setpoint to AO 1 (0 up to the Max limit in AV 98) and reads position and status; two sensor inputs can be read over the bus. The setpoint can also come from a 0-10 V signal, chosen with SpSource.
This page lists 20 BACnet objects for the Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) — 8 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Belimo’s own free documentation, linked below.
- Manufacturer
- Belimo
- Model
- PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)
- Equipment
- Butterfly valve actuator
- Equipment type
- Valves & actuators
- BACnet objects
- 20 (8 writable)
- Transport
- BACnet MS/TP
- Firmware
- 08.03.0003 (application 03.04-0000)
- Default device instance
- 1
- Also known as
- PR..-BAC-.., Belimo PR actuator, PR BACnet
BMS integration notes: Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)
Leave MV 122 SpSource at Bus (the default) and command AO 1 SpRel. Read AI 1 position and BI 101 summary status. If a bus watchdog is set in AV 130, keep writing AO 1 (or MO 1) within that time.
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.
| Object | Name | Why | Access |
|---|---|---|---|
| AO 1 | SpRel | Valve setpoint, % (0 to Max, AV 98) | Command |
| MV 122 | SpSource | Must be Bus for AO 1 to take effect | Write |
| AI 1 | RelPos | Valve position feedback | Read |
| BI 101 | SummaryStatus | Overall OK / not OK alarm | Read |
Enable & remote start
MV 122 SpSource selects the setpoint: Bus (2, default) uses AO 1; Analog (1) follows the 0-10 V signal on wire 3. MO 1 Override can force Open, Close or a fixed Min/Mid/Max position.
Heartbeat & communication loss
AV 130 Bus Watchdog (0-3600 s, default 0 = off). When set, each write to AO 1 or MO 1 restarts the timer; on timeout the AO 1 priority array is cleared, the relinquish default applies, and MI 110 shows Bus Watchdog triggered. With SpSource = Analog only MO 1 writes are tracked.
Network setup
- MS/TP only: baud 9600, 19200, 38400 or 76800 (default 38400); address 0-127 (default 1).
- Device instance 0-4194302, default 1.
- Max 32 nodes without repeater; a 120 ohm termination is built in and set with the configuration tool (BI 99 shows it).
- Configure with the Belimo Assistant App.
Watch out for
- Persistent writable objects are not meant to be written on a regular basis.
- AO 1 is limited to 0 up to Max (AV 98, 30-100 %, default 100).
- Max 6 active COV subscriptions, lifetime up to 8 hours.
Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) 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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AImin | 1 | RelPos | Relative position | % | Read | |
| AI | 2 | AbsPos | Absolute position (degrees or mm, by actuator) | ° | Read | |
| AI | 6 | SpAnalog | Analog setpoint when SpSource is Analog | % | Read | |
| AI | 20 | Sens1Analog | Sensor 1 value when Sens1Type is Active | Read | ||
| AI | 21 | Sens2Analog | Sensor 2 value when Sens2Type is Active | Read | ||
| AOmin | 1 | SpRel | Bus setpoint, 0 to Max (AV 98) | % | Command | |
| AV | 98 | Max | Maximum setpoint, at least 30 % | % | Write | |
| AV | 130 | Bus Watchdog | Bus watchdog timeout, 0 = off | s | Write | |
| BI | 20 | Sens1Switch | Sensor 1 as switch input | Read | 0=Inactive, 1=Active | |
| BI | 21 | Sens2Switch | Sensor 2 as switch input | Read | 0=Inactive, 1=Active | |
| BI | 99 | BusTermination | 120 ohm bus termination enabled | Read | 0=Inactive, 1=Active | |
| BImin | 101 | SummaryStatus | Summary of MI 106 and MI 110 | Read | 0=OK, 1=Not OK | |
| MI | 100 | InternalActivity | Internal test running | Read | 1=None, 2=Test, 3=- | |
| MI | 106 | StatusActuator | Actuator status | Read | 1=OK, 2=Actuator cannot move, 3=Gear disengaged, 4=Mechanical travel increased | |
| MI | 110 | StatusDevice | Device status, incl. bus watchdog | Read | 1=OK, 2=Bus Watchdog triggered | |
| MO | 1 | Override | Override the setpoint with fixed positions | Command | 1=None, 2=Open, 3=Close, 4=Min_Vmin, 5=Mid_Vmid, 6=Max_Vmax | |
| MV | 120 | Command | Service command: test or status reset | Write | 1=None, 2=-, 3=Test, 4=Reset | |
| MVmin | 122 | SpSource | Setpoint source: analog wire 3 or bus AO 1 | Write | 1=Analog, 2=Bus | |
| MV | 220 | Sens1Type | Sensor 1 type | Write | 1=None, 2=Active, 3=Passive_1k, 4=Passive_20k, 5=Switch, 6=PT1000_C, 7=NI1000_C, 8=NTC10K_C, 9=PT10000_F, 10=NI1000_F, 11=NTC10K_F | |
| MV | 221 | Sens2Type | Sensor 2 type | Write | 1=None, 2=Active, 3=Passive_1k, 4=Passive_20k, 5=Switch, 6=PT1000_C, 7=NI1000_C, 8=NTC10K_C, 9=PT10000_F, 10=NI1000_F, 11=NTC10K_F |
No points match these filters.
Integration notes
- AbsPos reads in degrees on rotary actuators and mm on linear ones; degrees shown.
- Sensor analog values (AI 20/21) are in V, ohm, °C or °F depending on the sensor type, so no unit is shown.
- Sensor objects and the analog setpoint go Out_Of_Service when they do not apply to the selected sensor type or setpoint source.
- StatusActuator states marked * in the PICS (actuator cannot move, travel increased) stay set until reset with Command (MV 120) = Reset.
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 PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) 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 Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)
How many BACnet points does the Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) have?
This list has 20 BACnet objects: 5 analog inputs, 1 analog output, 2 analog values, 4 binary inputs, 3 multi-state inputs, 1 multi-state output, 4 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) BACnet points are writable?
8 of the 20 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.
Where is the official Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) BACnet documentation?
The source is BACnet PICS, Butterfly Valve Actuator PR..-BAC-.., revision 2020-05, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/BACnet/belimo_BACnet_Interface-description_PR_V3_4_en-gb.pdf.
What are the minimum BACnet points to integrate the Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)?
Start with AO 1 SpRel (Valve setpoint, % (0 to Max, AV 98)); MV 122 SpSource (Must be Bus for AO 1 to take effect); AI 1 RelPos (Valve position feedback); BI 101 SummaryStatus (Overall OK / not OK alarm).
How do I enable BMS control of the Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)?
MV 122 SpSource selects the setpoint: Bus (2, default) uses AO 1; Analog (1) follows the 0-10 V signal on wire 3. MO 1 Override can force Open, Close or a fixed Min/Mid/Max position.
Does the Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP) need a BACnet heartbeat or have a communication timeout?
AV 130 Bus Watchdog (0-3600 s, default 0 = off). When set, each write to AO 1 or MO 1 restarts the timer; on timeout the AO 1 priority array is cleared, the relinquish default applies, and MI 110 shows Bus Watchdog triggered. With SpSource = Analog only MO 1 writes are tracked.
How do I check these points on the real PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)?
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.
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Source: BACnet PICS, Butterfly Valve Actuator PR..-BAC-.. · rev. 2020-05. Object names, instances and units are reproduced as published; descriptions are our own.