What a BMS typically does
Building automation commonly supervises HVAC equipment, temperatures, pressures, schedules, alarms, plant sequences, meters and other building-service points. Industrial sites may also have separate process-control systems with different ownership and operational priorities.
BMS vs CMMS
| BMS/BAS | CMMS/EAM |
|---|---|
| Real-time or near-real-time equipment state | Work history and maintenance workflow |
| Control sequences and setpoints | Planning, labor, parts and scheduling |
| Alarms and trends | Asset record and lifecycle context |
| Operator control | Maintenance authorization and closeout |
Useful integration patterns
A high-value integration may create a maintenance notification after a persistent or qualified alarm, link the technician back to a BMS trend, or synchronize asset identifiers. Sending every transient alarm to the CMMS usually produces noise rather than useful work.
Controls optimization
Scheduling, setpoints, simultaneous heating/cooling, sensor calibration and sequence logic can strongly affect comfort and energy. Changes should be documented and tested because a “small” control change can affect multiple zones or equipment stages.
Connected building systems are OT
NIST's OT-security guidance covers programmable systems that monitor or change the physical environment; building automation can fall within that broader OT context. Facilities teams therefore need coordination with IT/security for inventory, network boundaries, remote access and change control.