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1、PLCcontroladvantageAnycontrolsystemfromconcepttoenterfactoryworkhavetoundergofourstages.PLCsystemineachstagehasadvantage.Thefirststageisdesignedtoplantneeds,studyandformulatecontrolstrategy,thetraditionaloperatingplatformdesignandmanufacturemustbefinishedbeforeindesign.PLCsyst
2、emjustneedisavagueaboutthesizeofthemachinemayideaandI/Onumberofrequirements(muchinputandoutputinterface).Inthisphaseinputandoutputchipverycheap,socanabuilt-inverysoundreservecapacity,itallowsusedtosupplementomissionforfutureexpansionprojectandprepareit.Secondly,thetraditionald
3、esignschemeis,everyjobisa"oncemoldings"theinevitablecausedengineeringdelaysandincreasecosts.APLCsystemsusethesimpleststandardbolttogether.InsuchaconnectionnextbeganwritingPLCprogram(oratleasttheprogramcodes)writedetailed.Thenextstageistoinstall,installationisakindofcomplicated
4、andexpensivework,suchastheinstallsensors,actuators,limitswitchsystemandthehostofconnection.DistributedPLCsystemsuseseriallinkstypepre-compiled,testinginterfacecanbesimplifiedinstallithavecomeatahugecostadvantage.PLCprogrammostinthisstagefinish.Finallycommissioning,andthisiswha
5、tistheadvantageofPLCrealwereexcavatedpart.Withoutanyequipmentinthefirstwouldworknormally.Suchishumannature,there'ssomeomissions.Andthetraditionalsystemchanges,comparedthetime-consumingandexpensivePLCdesignerprovidedsystembuilt-inbackupmemoryreserves,spareI/Oandsomesparemuchcor
6、ecable,mostofthechangestocanbequicklyandrelativelycheapcompleted,anotherbenefitisthatallchangesPLChasrecords,programdeguggingandmodifywon'tbecauseunrecordedlost.Thisisaregularsystemoftenhappensintheproblem.Thereisanadditionalfifthstage,maintenance,oncestartedwork,andhandoverth
7、eproductionhasproducedmaintenance.Allequipmentallhaveweaknesses,mostequipmentinthewrongmodespentmuchoftheirtime.PLCsystemprovidesaverypowerfultooltohelpdiagnosefailure.PLC的控制优势任何控制系统从概念到进入工厂工作都要经历四个阶段。PLC系统在每一个阶段都有优势。第一个阶段是设计，对工厂的需要进行研究和制定控制策略，传统的运行平台的设计和制造必须在设计进行前完成。PLC系统仅仅需要
8、的是一个模糊的关于机器的可能大小的想法和I/O数量的要求（多少输入和输出接口）。在这个阶段输入和输出芯片十分便宜，所以可以
