What does DDC stand for?

What does DDC stand for?

• A. Digital Direct Control
• B. Direct Data Control
• C. Direct Digital Control
• D. Dual Digital Control

Answer: (C)

Direct Digital Control is a building-automation term for a control system where a digital controller directly processes sensor inputs (like temperature, pressure, or damper positions) and sends commands to actuators. Direct means the controller acts directly on the process without intermediate analog loops; Digital means the processing happens in a processor, allowing programming, logic, and precise calculations. Control indicates it’s a feedback setup that uses measured values to adjust outputs toward a desired setpoint. This approach is common in HVAC and building management because digital controllers can run complex logic or PID routines, log data, and communicate with other systems. The other phrasings aren’t standard terminology for this concept.

Direct Digital Control is a building-automation term for a control system where a digital controller directly processes sensor inputs (like temperature, pressure, or damper positions) and sends commands to actuators. Direct means the controller acts directly on the process without intermediate analog loops; Digital means the processing happens in a processor, allowing programming, logic, and precise calculations. Control indicates it’s a feedback setup that uses measured values to adjust outputs toward a desired setpoint. This approach is common in HVAC and building management because digital controllers can run complex logic or PID routines, log data, and communicate with other systems. The other phrasings aren’t standard terminology for this concept.