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1、TalksonthedevelopmentalandoutlookofPLCXIAXue-ming,JIAYing-bu(NorthernMach-ElectionVocationalSchool,Zhangjiakou075000,China)Abstract：Withthedevelopmentofcorporatedcircuitsandtechniqueofcomputers,the-fifth-generationPLChascomeintobeingDuetotheadvantagesofstablility,reliability,cheapprice,fullfunc
2、tions,convenienttouseandeasytooperateandmaintenance,ithasbeenwidelyused.WiththenetworkofPLC,Itwillbeusedmorewidely.Keywords：PLC,Development,Market,Interface1PLCdevelopmentandthemarketsituation1.1ThehistoryofthedevelopmentofPLC1968GeneralMotorsCorporationproposedtoreplacerelaycontroldevicerequir
3、ements,thenextyeardigitalequipmentcompanydevelopedthefirstgenerationofprogrammablecontroller,thecompanyassemblylinerequirements.Enteredthe1970sinthe20thcentury,withthedevelopmentofmicroelectronicstechnology,particularlyusingmicroprocessorPLC,Thiscontrollerisnotconfinedtothelogicoftheoperation,h
4、asfurtherstrengthenedthefunctionalintegration,nowthefifthgenerationofPLCproducts.Inthe1980stothemid-1990s,thePLCisthefastest-growingperiod,theannualgrowthratehasbeenmaintainedat30%~40%.AsPLCHandlingcapacityandnetworksimulationfunctionsoftheprogress,DCSdivertingpartofthegradualmonopolizationofth
5、emarketandsewagetreatmentindustries,butduetotheemergenceofindustrialPC.Inrecentyearsinparticularfieldbustechnologydevelopment,IPCandFCSalsodivertingpartofthePLCmarket.SoPLCgrowthrateinrecentyears,hasgraduallysloweddown.1.2ChinaPLCmarketApplicationofthePLC,Chinaisveryactiveinrecentyearsintothene
6、wyearabout100,000setsofPLCproducts,withannualsalesofthreebillionyuan,andapplicationindustryarequiteextensive.PLCdomesticproductionofabout30plants,butdidnotbecomeafull-scaleproductioncapacityandbrand-nameproductsThereissomeimitation,componentassemblyor"label"meansofproduction,ThereforewecansayPL
7、CinChinahasnotformedmanufacturingindustries.Asaprinciple,technicalandtechnologicalnodifficultyincutting-edgetechnologyproducts,aslongastheeffortistocreatethemanufacturingindustries.Productsinthemarketpotentialisenormous,notonlyino
