What is a DDC controller?
By Bassirou Thiam, building automation engineer · Updated
A DDC (direct digital control) controller is the field device that reads sensors, runs the control sequence in software and drives actuators for a piece of equipment or a system: an air handler, a VAV box, a plant. It talks to other controllers and the front end over a network such as BACnet.
Field versus supervisory
Field controllers run one system each. Supervisory controllers sit above them, manage a group of trunks and connect them to the front end.
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Related
GlossaryWhat is a supervisory controller (JACE)?Definition of a supervisory controller in a BAS, such as a Niagara JACE: the device that manages field controllers and connects them to the front end.
GlossaryWhat is an I/O point in building automation?Definition of an I/O point in building automation: a physical input or output wired to a controller terminal, as counted in the points list.
GlossaryWhat is a BACnet PICS?Definition of a BACnet PICS, the Protocol Implementation Conformance Statement that lists the BACnet services and objects a device supports.