外文文献译文_免费下载外文文献译文设计(论文)题目:专业与班级:电气工程及其自动化1004班学生姓名:马聪指导教师:郑长海2013年11月5日ThedevelopmentandfutureofPLCPart1PLCoverviewProgrammablecontrolleristhefirstinthelate1960sintheUnitedStates,ontroller(ontroller),timing,sequencenumber,,flexible,genericandotheradvantagesandrelaycontrolsystemsimpleandeasytooperate,,-1970s,thePLChasbeenwidelyusedasacentralprocessingunitmicroprocessor,importexportmoduleandtheexternalcircuitsareused,large-scaleintegratedcircuitsevenwhenthePLCisnolongertheonlylogical(IC)judgmentfunctionsalsohavedataprocessing,(IEC)standardspromulgatedprogrammablecontrollerforprogrammablecontrollerdraftmadethefollowingdefinition:putersoperatingsystem,,usedtoimplementlogicintheirinternalstorageoperations,sequencecontrol,timing,countingandarithmeticoperations,suchasoperatinginstructions,andthroughdigitalandanaloginputandoutput,,andindustrialcontrolsystemseasilylinkedtoformawhole,,isanon-contactequipment,,-puter,(PLC),,havebeenwidelyusedinindustryincludingmanufacturingsystems,transportationsystems,chemicalprocessfacilities,,thePLCreplacedthehardwiredlogicwithsoft-wiredlogicorso-calledrelayladderlogic(RLL),aprogramminglanguagevisual
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