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时间:2018-11-09
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1、2012届毕业设计说明书外文文献翻译院、部:电气与信息工程学院学生姓名:指导教师:职称副教授专业:班级:完成时间:PLCTheoryAndApplicationsAprogrammablelogiccontroller,PLC,orprogrammablecontrollerisasmallcomputerusedforautomationofreal-worldprocesses,suchascontrolofmachineryonfactoryassemblylines.ThePLCusually
2、usesamicroprocessor.Theprogramcanoftencontrolcomplexsequencingandiswrittenbyskilledengineers.Theprogramisstoredinbattery-backedmemoryand/orEEPROMS.Definitionis:adigitalelectroniccomputeroperatingsystemspecificallydesignedforusingintheindustrialenvironme
3、nt.Itadoptsacategoryprogrammablememoryforitsinternalstorageprocedures,theimplementationofthelogicaloperations,sequencecontrol,timing,countingandarithmeticoperationssuchasuser-orientedinstructions,andthroughdigitaloranaloginput/outputcontrolvarioustypeso
4、fmachineryorproductionprocesses.1PLCDevelopmentCourseInindustrialproductionprocesses,alargenumberofswitchesinordertocontrolitinalogicalsequenceofmovesconditions,andinaccordancewiththelogicofrelationschainprotectionmovement’scontrol,andalargenumberofdisc
5、retevolumedatacollection.Traditionally,thesefunctionsareachievedthroughpneumaticorelectricalcontrolsystem.1968U.S.GM(GeneralMotors)companyreplacedfollowingelectricalcontroldevices,thesecondyear,theU.S.companyhasdevelopedanumberofintegratedcircuitsandele
6、ctronictechnology-basedcontroldevices,thefirstuseofthemeansoftheproceduresappliedtotheelectricalcontrol,andthisisthefirstgenerationprogrammablecontrollersaidProgrammableController(PC)ThefunctionalityofthePLChasevolvedovertheyearstoincludetypicalrelaycon
7、trol,sophisticatedmotioncontrol,processcontrol,distributedcontrolsystemsandcomplexnetworking.Personalcomputer(PCforshort)hasbeendeveloped,inordertofacilitate,butalsotoreflectthefunctionalcharacteristicsofprogrammablecontrollers.Programmablecontrollerisn
8、amedProgrammableLogicController(PLC),nowPCisoftencalledPLC.2ProgrammableControllerBasicTenetsPLCisbasedoncomputers,andappliestoindustrialmotorcontrollingworksite.Itoriginatedfromrelaycontroldevices,butitdoesrelaydevices,thephysic
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