direct digital control


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direct digital control

[də¦rekt ¦dij·əd·əl kən′trōl]
(control systems)
The use of a digital computer generally on a time-sharing or multiplexing basis, for process control in petroleum, chemical, and other industries.
References in periodicals archive ?
Direct digital controls were introduced incrementally in the latter half of the 1980s.
All remaining three-way control valves were converted to two-way direct digital control.
Tenders are invited for interface new direct digital control system: includes new controller and all components needed for hvac control system upgrade; provide necessary software for programming, monitoring and alarm notification of ddc system; provide building static pressure transmitter and exhaust fan start/stop relay for the existing exhaust fan.
Users of building direct digital control (DDC) systems do not care about what communications technologies are used by the industry.
There is no doubt that direct digital control (DDC) has transformed the HVAC industry.
4 Install A New Direct Digital Control (Ddc) System That Will Include Carbon Dioxide Monitoring.
Tenders are invited for supply and install one (1) new wireless trane tracer web-based direct digital control (ddc) facility management and temperature control system to operate two (2) existing trane dx rooftop units (rtu1 and rtu2).
For Doan, networked direct digital control (DDC) is summed up as "peace of mind," since the control system is always the last one in the building.