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1、译文标题PLC、工业PC与DCS的特点与趋势原文标题ThecharacteristicsandtrendsofPLC,DCSandindustrialPC作者Charles译名查尔斯国籍美国原文出处NutsandVolts29-07Agust.2008ThecharacteristicsandtrendsofPLC,DCSandindustrialPCABSTRACT:Atpresent,widelyusedinindustrialautomationsystemsofthethreelargeindustrialPC,DCSandPLC.Here
2、,fortheireconomicandtechnologicalstandardsanddevelopmenttrendsdescribed.KEYWORDS:PLCPCDCSautomationtrendsFirst,thecharacteristicsandApplicationofPLC1-PLCApplicationEarlyPLC(ProgrammableLogicController,PLC),mainlytoreplacerelaylogiccontroltoachieve・Withcomputertechnology,commun
3、icationstechnologyandtherapiddevelopmentofautomaticcontroltechnology,thePLCwillbethetraditionalrelaycontroltechnologyandtheemergingcomputertechnologyandcommunicationstechnologyintegration,withhighreliability,strongfunctionandflexible,Programmingsimple,easytouseandaseriesofadva
4、ntages,aswellasgoodperformanceoftheindustrialenvironmentandcontroltargetsofperformanceinindustrialproductioninawiderangeofapplications.1969,theUnitedStatesDigitalEcjuipmentCorporation(DEC)developedtheworld'sfirstprogrammablecontroller.Earlyseparationfromtheprogrammablecontroll
5、ercomponentsandsmallandmedium-sizedintegratedcircuitcomponent,themainfunctionpreviouslyperformedbytherelayiscompletedsequencecontrol,suchastiming.Theearly1970s,smallsize,strongfunctionandcheapermicroprocessorsusedPLC,makesthePLCfunctionhasbeenenhancedsignificantly.Intermsofhar
6、dware,inadditiontomaintainingitsoriginalswitchmodules,hasalsoincreasedthesimulationmodule,remoteI/Omodulesandspecialfunctionmodulesall.Intermsofsoftware,easytousePLCElectricstaffintheladderdiagramprogramminglanguage,inadditiontomaintainingtheoriginallogicfunctions,hasalsoincre
7、asedthearithmeticoperations,dataprocessingandtransmission,communicationsandself-diagnosticcapabilities.Inthe1980rs,thelate,asultra-large-scaleintegratedcircuittechnologyisdevelopingrapidly,microprocessormarketasharppricedrop,thePLCmakesthemicroprocessorsusedbythegeneralimprove
8、mentingrades.Furthermore,inordertofurtherimprovetheprocessing
