Smoke exhaust fan control principle diagram to fire control valve to DDC control what do you mean?
DDC (Direct, Digital, Control) direct digital controller. The composition of the DDC system usually consists of a central control device (centralized control computer, color monitor, keyboard, printer, uninterruptible power supply, communication interface, etc.) the DDC controller, communication network, and the corresponding sensors, actuators, valves and other components.
The DDC here is equivalent to a small (local) host, which is responsible for receiving and feedback signals of fire dampers, and linkage to the fire control center.
