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The advent of electromechanical controls in the 1970s, analog controls in the 1980s, direct digital control (DDC) in the 1990s, and complete building control integration in the 2000s has progressively offered building owners and facility managers powerful new options for reducing energy costs and improving occupant
15 Aug 2016 DDC is the current industry standard for the major control systems, such as HVAC control and is based on the use of microprocessors, software, and electronic control devices. The basic control system monitors field devices and sensors that are connected to controllers or directly to a system headend.
o. ASHRAE SPC 135, wwwbacnet.org/ o. BTL BACnet Testing Laboratory, wwwbacnetassociation.org/ o. ASHRAE Guideline 13-2000,Specifying Direct Digital Control Systems o. oBIX Open Building Information Exchange wwwobix.org/ o. OASIS: Organization for the Advancement of Structured Information.
3 May 2007 Conditioning Engineers (ASHRAE) have produced an interesting guideline which will be explored. ASHRAE Guideline 13-2000. ASHRAE developed a guideline in. 2000 entitled Specifying Direct Digital. Control Systems. They have a slightly different definition of a DDC: A DDC system is composed of both.
General: Reference NU Direct Digital Control (DDC) Standards for reference to Northwestern. University Standards for Building Automation (BAS), Building Management Systems (BMS),. Automatic Temperature Control (ATC) standards including control diagrams, sequences and equipment. B. The publications listed below
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. 1791 Tullie Circle NE, Atlanta, GA 30329 wwwashrae.org. Specifying Direct. Digital Control. Systems. Addendum a to ASHRAE Guideline 13-2000. Approved by the ASHRAE Standards Committee on June 25, 2005, and by the ASHRAE Board
17 Feb 2016 1.1 Description. A. General: The control system shall consist of a high-speed, peer-to-peer network of DDC controller and an operator interface. 1. Each individual DDC device will be natively BACnet and will be capable of communicating directly using the BACnet communications protocol with other
DDC takes a centralized network-oriented approach. All instrumentation is gathered by various analog and digital converters which use the network to transport these signals to the central controller. The centralized computer then follows all of its production rules (which may incorporate sense points anywhere in the
Guidelines on Application of Central Control and Monitoring Systems. DDC outputs. Most systems distribute the software to remote controllers to eliminate the need for continuous communication capability (stand-alone). The central workstation is primarily used to monitor the status of the system, store back-up copies of the
     

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