Decentralized Logic in KNX Building Automation
KNX Building Automation is an OSI-based open standard for commercial and residential control. Unlike centralized systems, KNX utilizes a "Decentralized Topology," meaning there is no single "brain" or server that can fail and disable the entire building.
The system communicates over a "Twisted Pair" (TP) bus, Powerline, or IP network. Each device (sensor, actuator, or switch) has its own microprocessor. When a sensor (e.g., a CO2 monitor) detects a threshold breach, it broadcasts a "Group Address" telegram onto the bus. Any actuator programmed to listen to that address (e.g., a window motor) then executes the command. This architecture allows for extreme "Scalability" and "Interoperability," as products from different manufacturers can exist on the same bus and communicate seamlessly.