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1、外文翻譯資料PLCintheicestoragecentralair-conditioningsystemofcontrol1IntroductionInPLCin30yearswhichdeveloped,itpassesthroughdevelopsunceasingly,alreadycouldunifysimulatesI/O,thenetworkcorrespondsaswellasusesnewprogrammingstandardlikeIEC61131-3.However,engineersonlymustusedigitalI/
2、OandfewsimulationsI/Onumberaswellassimpleprogrammingskillonpotential80%industrialapplication.PLChasbeenwidelyusedinallindustrialsectors.Accordingto"TheUnitedStatesmarketinformation"WorldPLCandsoftwaremarketreport,in1995theglobalsoftwarePLCanditseconomiesofscaleofabout5billion
3、USdollars[5].Aselectronictechnologyandthedevelopmentofcomputertechnology,Becauseusestraditionalthetooltobepossibletosolve80%industrialapplication,likethisintenselyneedstohavelowcostsimplePLC;ThuspromotedthelowcostminiaturePLCgrowth,ithastheusefultrapezoidallogicalprogrammingd
4、igitalI/O.However,thishasalsocreatedthediscontinuityinthecontroltechnology,ontheonehand80%applicationneedtousethesimplelowcostcontroller,butontheotherhandother20%applicationthenhavesurpassedthefunctionwhichthetraditioncontrolsystemcanprovide.Engineerisdevelopingthese20%applic
5、ationtoneedtohavethehighercirculationspeed,theseniorcontrolalgorithm,themoresimulationsfunctionaswellascanwellandtheenterprisenetworkintegration.In80andthe90's,thesemustdevelop"20%application"engineershadconsideredusesPCintheindustrycontrol.PCprovidesthesoftwarefunctionmaycar
6、ryouttheseniortask,providestherichprogrammingandtheuserenvironment,andthePCCOTSpartenablescontrolengineerthetechnologywhichdevelopsunceasinglytouseinotherapplications.Thesetechnologiesincludingfloatingpointprocessor;HighspeedI/Omainline,likePCIandethernet;Fixeddatamemory;soft
7、waredevelopmentkit.MoreoverPCalsocanprovidetheincomparableflexibility,highlyeffectivesoftwareaswellasseniorlowcosthardware.Icethermalstorageairconditioningisthecentralpowergridcouldberedundant-nighticeelectricityintheformofcoldstorage,inthedaytimepeakhours17外文翻譯資料ofelectricit
8、ytoprovideair-conditioningservicesmeltingice.Asmostpartsofourcountry