中英文翻译--可编程控制器.doc

1PLCPLCnameinEnglishProgrammableLogicController,theChinesecalledtheprogrammablelogiccontroller,basedoncomputertechnologyisanewtypeofindustrialcontroldevices.Itusesaclassofprogrammablememory,foritsinternalstorageprocedures,theimplementationoflogicoperations,sequencecontrol,timing,countingandarithmeticoperations,suchasuser-orientedinstruction,anddigitaloranaloginput/outputcontrolofalltypesthemechanicalorproductionprocess.PLCisaprogrammablelogiccircuits,andhardwareisalsoaverystrongcombinationoflanguage,inthesemiconductorhasaveryimportantapplication,isaplacewheretheresemiconductorPLC.Itsmainfeaturesincludethefollowing:1.Highreliability,stronganti-interferenceabilityHighreliabilityofelectricalcontrolequipmentisthekeytoperformance.PLCasaresultoftheuseofmodernlarge-scaleintegratedcircuittechnology,strictproductionprocess,theinternalcircuittotakeanadvancedanti-jammingtechnology,withhighreliability.Forexample,theproductionoftheMitsubishiFseriesPLCMTBFofupto300,000hours.SomeuseofthePLCsCPUredundancyMTBFlongerworkinghours.FromthePLCcircuitofthemachine,theuseofPLCcontrolsystemconstitutes,andthesamesizeoftherelaycontactsystem,electricalwiringandtheswitchcontacthasbeenreducedtoafewhundredsoreventhousandths,faultwillbegreatlyreduced.Inaddition,PLChardwarefailurewithself-detection,failurealarminformationintime.Intheapplicationsoftware,theapplicationalsocanbeincorporatedintotheexternaldevicefaultself-diagnosisprocedure,thesysteminadditiontothecircuitoutsidethePLCandequipmenthasalsobeentheprotectionFaultself-diagnosis.Inthisway,theentiresystemwithextremelyhighreliabilityisnotstrange.2.Completepackage,perfectfunctionsandapplicabilityDevelopmentofPLC,haveformedlarge,mediumandsmallseriesproductsofallsizes.Ofallsizescanbeusedforindustrialcontroloccasions.Inadditiontothelogicalprocessingfunctions,themostmodernPLCequippedwithasophisticatedcomputingpowerdatacanbeusedinavarietyofdigitalcontrol.PLCinrecentyearsalargenumberoffunctionalunits,sothatpenetrationtothepositionofPLCcontrol,temperaturecontrol,CNCandotherindustrialcontrol.CoupledwithenhancedcommunicationscapabilitiesPLCandhuman-machineinterfacetechnology,theuseofPLCcontrolsystemcomposedofavarietyofveryeasily.3.Easytolearnandusebyengineeringstaffwelcomes2PLCasageneral-purposeindustrialcontrolcomputer,istheindustrialcontrolequipmentforindustrialandminingenterprises.Itinterfaceseasily,easyprogramminglanguageforengineeringandtechnicalstaff.Ladderlanguagegraphicsymbolsandexpressions,andveryclosetotherelaycircuit,onlyasmallamountofPLClogiccontrolcommandswitchcaneasilyachievethefunctionsoftherelaycircuit.Isnotfamiliarwithelectroniccircuits,computerprinciplesanddonotuseassemblylanguagetoengageinindustrialcontrolcomputerandopenedthedoor.4.Systemdesign,constructionworkinsmall,easymaintenance,easytotransformPLCconnectionwithstorageinplaceoflogiclogic,greatlyreducingthewiringandexternalcontrolequipmenttocontroldesignandconstructionofthecycleismuchshorter,atthesametimehasbecomeeasytomaintain.Moreimportantly,theequipmenthavebeenchangedsothatthesameproceduretochangetheproductionprocesspossible.Itissuitableformulti-variety,smallbatchproductionofoccasions.5.Smallsize,lightweight,lowenergyconsumptionToultra-smallPLCasanexample,thenewvarietiesproducedatthebottomofsizelessthan100mm,weightlessthan150g,justafewwattspowerconsumption.Duetosmallsizeeasilyintotheinternalmachinerytoachievetheidealofmechanicalandelectricalcontrolequipmentintegration.ThereasonwhywechoosetheabovereasonsPLC,itsbasicstructurecanbe?Fromthesub-structure,PLCisdividedintofixedandmodular(modular)two.FixedPLCincludingCPUboards,I/Oboard,displaypanel,memoryblocks,powerandsoon,intoacombinationoftheseelementsarenotremovableasawhole.ModularPLCincludingtheCPUmodule,I/Omodules,memory,powersupplymodules,backplane,orchassis,themodulescanbeconfiguredaccordingtocertainrulesofcombination.PLCsoftwaresystembythesystemproceduresanduserprogramcomposedoftwoparts.Systemprocedures,includingmonitoringprocedures,compiler,diagnosticprocedures,mainlyforthemanagementoftheentiremachine,programminglanguagewillbetranslatedintomachinelanguage,machinefaultdiagnosis.SystemsoftwareprovidedbythePLCmanufacturersandhasbeencuringintheEPROMcannotdirectlyaccessandintervention.Userprogramistheusercontrolatthescene,thePLCprogramminglanguageusedinthepreparationofapplications(thatis,logiccontrol)isusedtoachieveavarietyofcontrol.STEP7forSIMATICprogrammablelogiccontrollerofthestandardconfigurationandprogrammingsoftwarepackage,thatis,userprograms,weareusedtocarryoutSTEP7hardwareconfigurationandlogic3programming,logicprogramming,aswellasresultsoftheimplementationofonlinesurveillance.PLCcourseofdevelopmentintheindustrialproductionprocess,alargenumberofswitchestocontrolthevolumeoftheorder,whichinaccordancewiththetermsoftheorderofthelogicofaction,andinaccordancewiththelogicoftherelationshipbetweenthechaintoprotectthecontrolaction,andalargenumberofdiscretevolumedatacollection.Traditionally,thesefunctionsthroughpneumaticorelectricalcontrolsystemtoachieve.However,withadvancesinindustrialization,PLChascomeinawiderangeofapplications,anditsspecificapplicationofironandsteel,petroleum,chemical,electricpower,buildingmaterials,machinerymanufacturing,automobile,textile,transportation,environmentalprotectionandculturalentertainmentandotherindustries,theuseofmoreorlessswitchcanbesummarizedinthelogiccontrol,analogcontrol,motioncontrol,processcontrol,dataprocessing,communicationsandnetworking.21,PLCwillhavegreaterdevelopment.Fromatechnicalpointofview,thenewachievementsincomputertechnologywillbemoreprogrammablecontrollerusedinthedesignandmanufacturing,therewillbefaster,biggerstoragecapacity,intelligentspeciesemergedstronger；fromtheproductscaleofview,furthertothedirectionofultra-smallandlargedevelopment；fromthematchingofproducts,thevarietyofproductswillbemorerich,morecompletespecifications,theperfectman-machineinterface,acomprehensivecommunicationsequipmentwillbebetteradaptedtoavarietyofindustrialcontrolthedemandforplaces；fromthemarketpointofview,theproductionofmorevarietiesoftheirrespectiveproductsasinternationalcompetitionandtobreak,therewillbeafewbrandmonopolysituationintheinternationalmarket,therewillbeinternationalprogramminglanguage；fromthedevelopmentofthenetwork,theprogrammablecontrollersandotherindustrialcontrolcomputernetworkconstitutesalarge-scaleprogrammablelogiccontrollercontrolsystemisthedevelopmentdirectionoftechnology.Atpresent,computerdistributedcontrolsystemDCS(DistributedControlSystem)hasbeenalargenumberofprogrammablecontrollerapplications.Alongwiththedevelopmentofcomputernetworks,programmablecontrollers,asautomationandcontrolnetworksandinternationalnetworks,animportantpartinindustryandindustrialfieldsotherthanplayanincreasingrole.4可编程控制器PLC英文全称ProgrammableLogicController,中文全称为可编程逻辑控制器，是以计算机技术为基础的新型工业控制装置。它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算,顺序控制，定时，计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。PLC是可编程逻辑电路，也是一种和硬件结合很紧密的语言，在半导体方面有很重要的应用，可以说有半导体的地方就有PLC。其主要包括以下几个特点：1可靠性高，抗干扰能力强高可靠性是电气控制设备的关键性能。PLC由于采用现代大规模集成电路技术，采用严格的生产工艺制造，内部电路采取了先进的抗干扰技术，具有很高的可靠性。例如三菱公司生产的F系列PLC平均无故障时间高达30万小时。一些使用冗余CPU的PLC的平均无故障工作时间则更长。从PLC的机外电路来说，使用PLC构成控制系统，和同等规模的继电接触器系统相比，电气接线