可编程控制器原理及其应用外文文献翻译-其他专业

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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