Glossary
BMS (Building Management System)
Plain-Language Definition
A computer-based control system that monitors and manages a building's mechanical, electrical, and plumbing systems including HVAC, lighting, fire alarm, and access control.
Technical Context
A BMS (also called BAS — Building Automation System) integrates multiple building services into a single monitoring and control platform. It typically uses BACnet or Modbus protocols to communicate with field devices (sensors, actuators, controllers). Modern BMS platforms provide web-based dashboards, alarm management, trend logging, and energy reporting. A properly commissioned BMS can reduce energy consumption by 10-30% through optimised scheduling, setpoint management, and demand-based control. Key performance indicators include alarm response time, system availability (target >99.5%), and energy use intensity trend.
Why It Matters
A BMS is the nerve centre of building operations. Without one, HVAC systems run on fixed schedules regardless of occupancy, faults go undetected until equipment fails, and energy waste is invisible. For due diligence, the presence, age, and capability of the BMS significantly affects operating costs and maintainability.
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