The digital brains of modern facility automation.
Direct Digital Controllers (DDC) are microprocessor-based devices that read environmental data from sensors, process it using software logic, and precisely control HVAC and building equipment in real time to optimize energy efficiency and comfort.
Overview
A Direct Digital Controller (DDC) acts as a localized computer dedicated to building management. It continuously samples inputs (like temperature, pressure, and humidity) from a specific zone or piece of equipment. It then runs this data through pre-programmed control loops—most commonly PID (Proportional-Integral-Derivative) loops—and sends output commands to actuators, valves, and fans to maintain the exact desired conditions (setpoints).
DDCs are usually networked together, allowing facility managers to monitor, schedule, and troubleshoot an entire campus from a single centralized software interface.