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Zone valve actuator · BACnet points list
Belimo CQ24A-BAC CQ zone rotary actuator BACnet points list
Updated 12 November 2026Unofficial source
The CQ24A-BAC is a small rotary actuator for Belimo CQ zone valves with a built-in BACnet MS/TP interface. The BMS writes a 0-100 % position setpoint to AO 1 and reads back relative and absolute position, a summary status and a device status. An override object can force the actuator open, closed or to maximum.
This page lists 10 BACnet objects for the Belimo CQ24A-BAC CQ zone rotary actuator — 5 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Belimo’s documentation hosted by BACnet International catalog, not by Belimo itself, so treat it as unofficial.
- Manufacturer
- Belimo
- Model
- CQ24A-BAC CQ zone rotary actuator
- Equipment
- Zone valve actuator
- Equipment type
- Valves & actuators
- BACnet objects
- 10 (5 writable)
- Transport
- BACnet MS/TP
- Firmware
- Application 01.05.0001, firmware 09.00.0000
- Default device instance
- 1
- Also known as
- CQ24A-BAC, CQ Zone Rotary Actuator, Belimo CQ BACnet, ZoneTight CQ actuator
- Source document
- CQ24A-BAC CQ Zone Rotary Actuator - Protocol Implementation Conformance Statement and BACnet object description · CQ BACnet PICS V01.05.0001 · rev. 2018-12-12 (unofficial copy, hosted by BACnet International catalog)
Reference only, provided as-is: verify against Belimo’s current documentation and the live device before use. Not official Belimo information. Terms of use.
BMS integration notes: Belimo CQ24A-BAC CQ zone rotary actuator
Write the position setpoint to AO 1 and read AI 1 for feedback. Watch BI 101 for a general problem and MI 110 for a bus watchdog trip. If AV 130 is set, the BMS must refresh the setpoint within the timeout.
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 | Position setpoint, 0-100 % | Command |
| AI 1 | RelPos | Position feedback, % | Read |
| MI 110 | StatusDevice | Shows when the bus watchdog has tripped | Read |
| BI 101 | SummaryStatus | General status, 1 = not OK | Read |
Heartbeat & communication loss
AV 130 BusWatchdog sets the bus timeout in seconds (0 turns it off; the document gives 120 s as the parameterised default). MI 110 reports 'Bus Watchdog triggered' when it expires.
Network setup
- BACnet MS/TP master, 9600-115200 baud, default 38400.
- Default device instance 1.
- Parameterised with the Belimo Assistant App.
- Max_Master is writable (1-127); writing 0 is raised to 1.
Watch out for
- Writes outside an analog object's range are clamped silently.
- No segmentation.
Belimo CQ24A-BAC CQ zone rotary actuator 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 | ° | Read | |
| AOmin | 1 | SpRel | Relative position setpoint | % | Command | |
| AV | 98 | Max | Maximum position limit (30-100 %) | % | Write | |
| AV | 130 | BusWatchdog | Bus watchdog timeout, 0 = off | s | Write | |
| BImin | 101 | SummaryStatus | Summary status | Read | 0=OK, 1=Not OK | |
| MI | 100 | InternalActivity | Internal activity | Read | 1=None, 2=None, 3=Adaption, 4=Synchronization | |
| MImin | 110 | StatusDevice | Device status | Read | 1=OK, 2=Bus Watchdog triggered | |
| MO | 1 | Override | Override control | Command | 1=None, 2=Open, 3=Close, 4=None, 5=None, 6=Max | |
| MV | 120 | Command | Start a function (adaption, synchronization) | Write | 1=None, 2=Adaption, 3=None, 4=Synchronization |
No points match these filters.
Object ID lookup: Belimo CQ24A-BAC CQ zone rotary actuator point IDs by name
Integration notes
- Out-of-range writes to analog objects are clamped to the range limits without an error.
- The default of AV 98 Max is not a fixed number; the document says the motor control defines it.
- Up to 6 active COV subscriptions.
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 CQ24A-BAC CQ zone rotary actuator 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 CQ24A-BAC CQ zone rotary actuator
How many BACnet points does the Belimo CQ24A-BAC CQ zone rotary actuator have?
This list has 10 BACnet objects: 2 analog inputs, 1 analog output, 2 analog values, 1 binary input, 2 multi-state inputs, 1 multi-state output, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo CQ24A-BAC CQ zone rotary actuator BACnet points are writable?
5 of the 10 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 CQ24A-BAC CQ zone rotary actuator BACnet documentation?
Belimo does not publish it on its own website. This list comes from CQ24A-BAC CQ Zone Rotary Actuator - Protocol Implementation Conformance Statement and BACnet object description (CQ BACnet PICS V01.05.0001), revision 2018-12-12, a copy hosted by BACnet International catalog at https://www.bacnetinternational.net/catalog/manu/belimo%20automation%20ag/CQ%20BACnet%20PICS%20V01.05.0001.pdf. Ask Belimo or its representative for the current revision.
What are the minimum BACnet points to integrate the Belimo CQ24A-BAC CQ zone rotary actuator?
Start with AO 1 SpRel (Position setpoint, 0-100 %); AI 1 RelPos (Position feedback, %); MI 110 StatusDevice (Shows when the bus watchdog has tripped); BI 101 SummaryStatus (General status, 1 = not OK).
Does the Belimo CQ24A-BAC CQ zone rotary actuator need a BACnet heartbeat or have a communication timeout?
AV 130 BusWatchdog sets the bus timeout in seconds (0 turns it off; the document gives 120 s as the parameterised default). MI 110 reports 'Bus Watchdog triggered' when it expires.
How do I check these points on the real CQ24A-BAC CQ zone rotary actuator?
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: CQ24A-BAC CQ Zone Rotary Actuator - Protocol Implementation Conformance Statement and BACnet object description · CQ BACnet PICS V01.05.0001 · rev. 2018-12-12. Object names, instances and units are reproduced as published; descriptions are our own.