BACnet/IP: A Packet-Level Study of Objects, Priority Arrays, and Event Services
Industrial Control Systems (ICS) have traditionally relied on protocols that expose operational state through registers, coils, or cyclic polling mechanisms. BACnet follows a fundamentally different design philosophy.
Rather than representing automation systems as collections of memory locations, BACnet models an installation as a distributed object database. Sensors, actuators, schedules, alarms, trend logs, and even the controller itself are represented as standardized objects, each exposing a collection of typed properties that define configuration, operational state, and runtime behavior.
That architectural decision influences every layer of the protocol.
Application services no longer operate against register addresses, but against object instances and individual properties. Command execution is mediated through a sixteen-level priority arbitration model instead of simple value overwrites. Network communication extends beyond standard UDP messaging through the BACnet Virtual Link Layer (BVLL), enabling broadcast distribution and routing across IP subnets. At the application layer, clients may abandon traditional polling altogether in favor...
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