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1、外文翻译资料PLCintheicestoragecentralair-conditioningsystemofcontrol1IntroductionInPLCin30yearswhichdeveloped,itpassesthroughdevelopsunceasingly,alreadycouldunifysimulatesI/O,thenetworkcorrespondsaswellasusesnewprogrammingstandardlikeIEC61131-3.However,engineersonlymustusedigita
2、lI/OandfewsimulationsI/Onumberaswellassimpleprogrammingskillonpotential80%industrialapplication.PLChasbeenwidelyusedinallindustrialsectors.Accordingto"TheUnitedStatesmarketinformation"WorldPLCandsoftwaremarketreport,in1995theglobalsoftwarePLCanditseconomiesofscaleofabout5b
3、illionUSdollars[5].Aselectronictechnologyandthedevelopmentofcomputertechnology,Becauseusestraditionalthetooltobepossibletosolve80%industrialapplication,likethisintenselyneedstohavelowcostsimplePLC;ThuspromotedthelowcostminiaturePLCgrowth,ithastheusefultrapezoidallogicalpro
4、grammingdigitalI/O.However,thishasalsocreatedthediscontinuityinthecontroltechnology,ontheonehand80%applicationneedtousethesimplelowcostcontroller,butontheotherhandother20%applicationthenhavesurpassedthefunctionwhichthetraditioncontrolsystemcanprovide.Engineerisdevelopingth
5、ese20%applicationtoneedtohavethehighercirculationspeed,theseniorcontrolalgorithm,themoresimulationsfunctionaswellascanwellandtheenterprisenetworkintegration.In80andthe90's,thesemustdevelop"20%application"engineershadconsideredusesPCintheindustrycontrol.PCprovidesthesoftwar
6、efunctionmaycarryouttheseniortask,providestherichprogrammingandtheuserenvironment,andthePCCOTSpartenablescontrolengineerthetechnologywhichdevelopsunceasinglytouseinotherapplications.Thesetechnologiesincludingfloatingpointprocessor;HighspeedI/Omainline,likePCIandethernet;Fi
7、xeddatamemory;softwaredevelopmentkit.MoreoverPCalsocanprovidetheincomparableflexibility,highlyeffectivesoftwareaswellasseniorlowcosthardware.Icethermalstorageairconditioningisthecentralpowergridcouldberedundant-nighticeelectricityintheformofcoldstorage,inthedaytimepeakhour
8、s16外文翻译资料ofelectricitytoprovideair-conditioningservicesmeltingice.Asmostpartsofourcountry
