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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The new design upgraded the BAS system to a fully operational direct digital control (DDC) system with a Web-based graphical front end to provide increased monitoring capability, remote access and control.
Johnson Controls used personal environmental modules, highly integrated direct digital controls, as well as other technologies for an extensive renovation/new construction of its headquarters in 2009.
* Upgrade building controls, particularly by replacing pneumatic controls with direct digital control (DDC) technology.
While the transition from springs, diaphragms, and mercury switches to networked direct digital control (DDC) has been remarkable, the groundswell response to BACnet has revolutionized the building automation industry.
As part of the direct digital control system, the controls contractor installed the following equipment (Figure 1):
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.