What B-LSC Is
A BACnet device profile is a standardized capability level: a checklist of things a device must be able to do before it can wear the label. B-LSC (BACnet Life Safety Controller) is defined in Annex L of ANSI/ASHRAE 135-2024 (clause L.5.2) as a controller for life-safety systems: it generates life-safety event notifications and processes the silence and reset operations an operator performs on its life-safety points.
The checklist items are BACnet Interoperability Building Blocks (BIBBs), each a named unit of capability such as “generate life-safety notifications” (AE-LS-B). B-LSC is a B-role device: it answers requests and originates the alarms a supervisory system displays. A device documents its claim in its PICS (Protocol Implementation Conformance Statement); to verify a claim, ask for the PICS and check the profile line.
Where It’s Used
B-LSC fits a controller managing fire and life-safety points that must annunciate to a building system.
- Fire and smoke-control controllers. A device monitoring life-safety points and reporting alarm, supervisory, and trouble conditions to the head end (the central BMS server).
- Life-safety annunciation. A controller whose events drive a graphic or annunciator, and which accepts operator silence and reset commands.
- Integrated safety points. Life-safety inputs a building controller must surface as BACnet life-safety objects rather than plain binary points.
Required Services
The table below is the exhaustive service set required by the B-LSC BIBBs. Initiates means the device sends the request or notification; Executes means the device receives and acts on it (responding, for confirmed services). BIBB codes encode the same split: a -A BIBB is the initiating side, a -B BIBB the executing side. A - means the profile does not require that direction; a device may still support it.
| Capability area | Service | Required by BIBB | Initiates | Executes |
|---|---|---|---|---|
| Data sharing | ReadProperty | DS-RP-B | - | Yes |
| Data sharing | ReadPropertyMultiple | DS-RPM-B | - | Yes |
| Data sharing | WriteProperty | DS-WP-B | - | Yes |
| Data sharing | WritePropertyMultiple | DS-WPM-B | - | Yes |
| Data sharing | SubscribeCOV | DS-COV-B | - | Yes |
| Data sharing | ConfirmedCOVNotification | DS-COV-B | Yes | - |
| Data sharing | UnconfirmedCOVNotification | DS-COV-B | Yes | - |
| Alarm and event management | LifeSafetyOperation | AE-LS-B | - | Yes |
| Alarm and event management | ConfirmedEventNotification | AE-LS-B | Yes | - |
| Alarm and event management | UnconfirmedEventNotification | AE-LS-B | Yes | - |
| Alarm and event management | AcknowledgeAlarm | AE-ACK-B | - | Yes |
| Alarm and event management | GetEventInformation | AE-INFO-B | - | Yes |
| Device and network management | Who-Is | DM-DDB-A, DM-DDB-B | Yes | Yes |
| Device and network management | I-Am | DM-DDB-A, DM-DDB-B | Yes | Yes |
| Device and network management | Who-Has | DM-DOB-B | - | Yes |
| Device and network management | I-Have | DM-DOB-B | Yes | - |
| Device and network management | DeviceCommunicationControl | DM-DCC-B | - | Yes |
| Device and network management | TimeSynchronization ¹ | DM-TS-B | - | Yes |
| Device and network management | UTCTimeSynchronization ¹ | DM-UTC-B | - | Yes |
| Device and network management | ReinitializeDevice | DM-RD-B | - | Yes |
The life-safety rows depend on hosted objects. The AE-LS-B requirement means the device hosts Life Safety Point and Life Safety Zone objects that originate its notifications and receive the silence and reset operations.
¹ The profile requires one of the two time-synchronization services, not both. (Protocol_Revision is a readable property of the device’s Device object.)
Related Profiles
| Profile | How it differs from B-LSC |
|---|---|
| B-ALSC | Advanced Life Safety Controller: adds internal scheduling and an Event Log |
| B-BC | Building Controller: the general controller, without the life-safety event model |
| B-LSAP | Life Safety Annunciator Panel: the operator-side profile that displays these events |
What Chipkin Provides
The CAS BACnet Stack implements the BIBB set the B-LSC profile requires, including the life-safety event model and the silence and reset operations. Talk to us about building or integrating a B-LSC device on the stack.