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Last download on: Fri Apr 28, 2017 02:47:24 AM
SCADA stands for Supervisory Control And DatarnAcquisition. As the name indicates, it is not a fullrncontrol system, but rather focuses on the supervisoryrnlevel. As such, it is a purely software package that isrnpositioned on top of hardware to which it is interfaced,rnin general via Programmable Logic Controllers (PLCs),rnor other commercial hardware modules
SCADA systems are widely used in industry forrnSupervisory Control and Data Acquisition of industrialrnprocesses. Companies that are members ofrnstandardisation committees (e.g. OPC, OLE for ProcessrnControl) and are thus setting the trends in matters of ITrntechnologies generally develop these systems. As arnmatter of fact, they are now also penetrating thernexperimental physics laboratories for the controls ofrnancillary systems such as cooling, ventilation, powerrndistribution, etc. More recently they were also appliedrnfor the controls of smaller size particle detectors suchrnas the L3 muon detector and the NA48 experiment, tornname just two examples at CERNrnSCADA systems have made substantial progressrnover the recent years in terms of functionality,rnscalability, performance and openness such that theyrnare an alternative to in house development even forrnvery demanding and complex control systems as thosernof physics experiments. This paper describes SCADArnsystems in terms of their architecture, their interface tornthe process hardware, the functionality and applicationrndevelopment facilities they provide. Some attention isrnpaid to the industrial standards to which they abide,rntheir planned evolution as well as the potential benefitsrnof their use
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