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Fire damper actuator interface · BACnet points list
Belimo BKN230-24-MOD fire damper communication and power unit BACnet points list
Updated 12 November 2026Unofficial source
The BKN230-24-MOD plugs into AC 230 V, feeds DC 24 V to one fire damper actuator and puts it on BACnet MS/TP or Modbus RTU (chosen by DIP switch). A smoke detector can be wired straight to it. The BMS opens and closes the damper through MO 1 and reads position, power use and three status objects for actuator faults, device faults and smoke/temperature trips.
This page lists 13 BACnet objects for the Belimo BKN230-24-MOD fire damper communication and power unit — 4 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
- BKN230-24-MOD fire damper communication and power unit
- Equipment
- Fire damper actuator interface
- Equipment type
- Valves & actuators
- BACnet objects
- 13 (4 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0.1
- Also known as
- BKN230-24-MOD, BKN230-24-MOD-BAC, BKN230, Belimo BKN230 BACnet, Schako BKN230, 71589-00002
- Source document
- BKN230-24-MOD technical data sheet (Communication and power supply unit for motorised fire dampers) · 71589-00002.F · rev. 2018-05-03 (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 BKN230-24-MOD fire damper communication and power unit
Set the MS/TP address and baud by DIP switch, then command the damper with MO 1 (Open/Close) and read AI 1 for position. Map BI 101 as the general alarm and MI 111 for smoke or temperature trips. If AV 130 is non-zero, keep rewriting MO 1 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 |
|---|---|---|---|
| MO 1 | Override | Damper command: 2 = open, 3 = close | Command |
| AI 1 | RelPos | Damper position, % | Read |
| MI 111 | StatusTripping | Smoke detector or temperature sensor tripped | Read |
| MI 106 | StatusActuator | Actuator fault (blocked, disconnected, overcurrent) | Read |
| BI 101 | SummaryStatus | General status, 1 = not OK | Read |
Enable & remote start
With no command or no bus connected, the damper stays in its safety position. A wire bridge between terminals 1 and 4 opens it locally without a BMS.
Heartbeat & communication loss
AV 130 BusWatchdog (default 300 s, 0 = off) watches writes to MO 1. If MO 1 isn't rewritten in time, its priority array is cleared and the relinquish default applies; MI 110 shows BusWatchdog triggered.
Network setup
- DIP switches set baud (9600-76800), termination, BACnet or Modbus, and the MS/TP MAC address 0-127.
- Device instance = AV 121 (default 1000) + MAC address.
- Up to 64 active COV subscriptions.
Watch out for
- Actuator, device and tripping faults (except a bus watchdog trip) latch until reset with MV 120 = 4 or the test button.
- After local override (terminals 1+4), a stored smoke detector fault must be reset with the test button before the damper runs.
Belimo BKN230-24-MOD fire damper communication and power unit 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 damper position | % | Read | |
| AI | 2 | AbsPos | Absolute damper position | ° | Read | |
| AI | 130 | BusWatchdogCountdown | Time left on the bus watchdog | s | Read | |
| AI | 131 | ActPowerConsumption | Power consumption | W | Read | |
| AV | 121 | OffsetDeviceID | Device instance offset; instance = offset + MAC | Write | ||
| AV | 130 | BusWatchdog | Bus watchdog timeout, 0 = off (default 300) | s | Write | |
| BImin | 101 | SummaryStatus | Summary of MI 106, MI 110 and MI 111 | Read | 0=OK, 1=Not OK | |
| MOmin | 1 | Override | Damper open/close command | Command | 1=None, 2=Open, 3=Close | |
| MV | 120 | Command | Start test or reset; returns to None | Write | 1=None, 2=-, 3=Test, 4=Reset | |
| MI | 100 | InternalActivity | Shows a bus-started test run | Read | 1=None, 2=Test | |
| MImin | 106 | StatusActuator | Actuator fault status | Read | 1=OK, 2=Actuator cannot move, 3=-, 4=-, 5=Actuator disconnected, 6=Actuator too much current | |
| MI | 110 | StatusDevice | Device status | Read | 1=OK, 2=BusWatchdog triggered, 3=InternalError | |
| MImin | 111 | StatusTripping | Smoke detector and temperature sensor status | Read | 1=OK, 2=Smoke Detector triggered, 3=Temperature Sensor triggered, 4=Smoke Detector & Temp Sensor triggered |
No points match these filters.
Object ID lookup: Belimo BKN230-24-MOD fire damper communication and power unit point IDs by name
Integration notes
- The device instance is AV 121 OffsetDeviceID (default 1000) plus the DIP-switch MAC address; it can't be written through the Device object.
- If a smoke or temperature alarm trips, the damper moves to its safety position (closed) on its own.
- MO 1 shows Overridden while the local test button is active and Out of service while terminals 1 and 4 are bridged for local control.
- The same document also has a Modbus RTU register map; only the BACnet objects are listed here.
- Object names for AI 130 and AI 131 wrap onto two lines in the table; they are given here without the break.
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 BKN230-24-MOD fire damper communication and power unit 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 BKN230-24-MOD fire damper communication and power unit
How many BACnet points does the Belimo BKN230-24-MOD fire damper communication and power unit have?
This list has 13 BACnet objects: 4 analog inputs, 2 analog values, 1 binary input, 4 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 BKN230-24-MOD fire damper communication and power unit BACnet points are writable?
4 of the 13 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 BKN230-24-MOD fire damper communication and power unit BACnet documentation?
Belimo does not publish it on its own website. This list comes from BKN230-24-MOD technical data sheet (Communication and power supply unit for motorised fire dampers) (71589-00002.F), revision 2018-05-03, a copy hosted by BACnet International catalog at https://www.bacnetinternational.net/catalog/manu/belimo%20automation%20ag/PICS%20-%20bkn230-24-mod_datasheet_en-gb.pdf. Ask Belimo or its representative for the current revision.
What are the minimum BACnet points to integrate the Belimo BKN230-24-MOD fire damper communication and power unit?
Start with MO 1 Override (Damper command: 2 = open, 3 = close); AI 1 RelPos (Damper position, %); MI 111 StatusTripping (Smoke detector or temperature sensor tripped); MI 106 StatusActuator (Actuator fault (blocked, disconnected, overcurrent)); BI 101 SummaryStatus (General status, 1 = not OK).
How do I enable BMS control of the Belimo BKN230-24-MOD fire damper communication and power unit?
With no command or no bus connected, the damper stays in its safety position. A wire bridge between terminals 1 and 4 opens it locally without a BMS.
Does the Belimo BKN230-24-MOD fire damper communication and power unit need a BACnet heartbeat or have a communication timeout?
AV 130 BusWatchdog (default 300 s, 0 = off) watches writes to MO 1. If MO 1 isn't rewritten in time, its priority array is cleared and the relinquish default applies; MI 110 shows BusWatchdog triggered.
How do I check these points on the real BKN230-24-MOD fire damper communication and power unit?
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: BKN230-24-MOD technical data sheet (Communication and power supply unit for motorised fire dampers) · 71589-00002.F · rev. 2018-05-03. Object names, instances and units are reproduced as published; descriptions are our own.