DDC stands for which term in building automation?

DDC stands for which term in building automation?

• A. Direct digital controller (DDC)
• B. Digital data controller
• C. Distributed device controller
• D. Dynamic data controller

Answer: (A)

Direct Digital Controller refers to a device that uses a microprocessor to perform control calculations digitally and directly interfaces with sensors and actuators. In building automation, this is the standard term for controllers that read inputs like temperature, humidity, and pressure, run control algorithms (such as PID), and send commands to actuators like dampers and valves. The digital processing enables programmability, complex logic, and network communication (for example over BACnet or LonWorks), offering more precise and flexible control than older pneumatic or purely analog systems. The other phrases aren’t the established BAS term, so they aren’t used to describe this function.

Direct Digital Controller refers to a device that uses a microprocessor to perform control calculations digitally and directly interfaces with sensors and actuators. In building automation, this is the standard term for controllers that read inputs like temperature, humidity, and pressure, run control algorithms (such as PID), and send commands to actuators like dampers and valves. The digital processing enables programmability, complex logic, and network communication (for example over BACnet or LonWorks), offering more precise and flexible control than older pneumatic or purely analog systems. The other phrases aren’t the established BAS term, so they aren’t used to describe this function.