会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

外文翻译--PLC的特点.doc外文翻译--PLC的特点.doc -- 5 元

宽屏显示 收藏 分享

资源预览需要最新版本的Flash Player支持。
您尚未安装或版本过低,建议您

PLCCharacteristicPLCEnglishfulltitleProgrammableLogicController,Chinesefulltitleastheprogrammablelogicalcontroller,thedefinitionisOnekindofdigitaloperationoperationselectronicsystem,fordesignsspeciallyintheindustryenvironmentapplication.Itusesakindofprogrammablememory,usesinitsinternallystoredprogram,theactuatinglogicoperation,thesequentialcontrol,fixedtime,countingandarithmeticoperationandsoonfaceusersinstruction,andthroughdigitaleithersimulationtypeinput/outputcontroleachtypemachineryorproductionprocess.PLCcharacteristic2.1reliabilityishigh,antijammingability.dependingonthenatureistheelectriccontrolequipmentsessentialperformance.BecausePLCusesthemodernlargescaleintegratedcircuittechnology,usedthestricttechniqueofproductionmanufacture,theinternalcircuithasadoptedtheadvancedantijammingtechnology,hadtheveryhighreliability.ForexampletheMitsubishiCorporationproducesFseriesPLCmeantimebetweenfailurereachesashighasfor300,000hours.SomeuseredundancyCPUPLCaveragetroublefreeoperatingtimeislonger.FromthePLCoutsidetheaircraftelectriccircuit,usesthePLCconstitutioncontrolsystem,compareswiththesamelevelscalefollowingtheelectricalpickoffsystem,theelectricalwiringandtheswitchcontactreducedtoseveralhundredsevenseveralthousands1,thebreakdownalsogreatlyreduces.Inaddition,PLChasthehardwarefaultselfmeasuringability,presentswhenthebreakdownmaysendoutthewarninginformationpromptly.Intheapplicationsoftware,theapplicationmayalsoenrolltheperipherycomponentsbreakdownfromthediagnosticprogram,causesinthesystemalsoobtainsthebreakdownbesidesthePLCelectriccircuitandtheequipmentfromthediagnosisprotection.Thus,theoverallsystemhastheextremelyhighreliabilityalsonottofeelstrange.2.2necessarycomplete,thefunctionisperfect,serviceable.PLCdevelopstoday,hadalreadyformedthelarge,mediumandsmalleachscaleserializedproduct.Mayuseineachscaletheindustrialcontrolsituation.Besidesthelogicalprocessingfunction,modernPLCmostlyhastheconsummationdataoperationability,mayuseineachkindofnumericalcontroldomain.InrecentyearsthePLCfunctionunitemergedmassively,causesPLCtoseepthepositioncontrol,thetemperaturecontrol,CNCandsooneachindustrialcontrol.InadditionthePLCtrafficcapacitysenhancementandthemanmachinecontactsurfacetechnologysdevelopment,usesPLCtocomposeeachkindofcontrolsystembecomesveryeasy.2.3easytostudyeasilytouse,thedepthiswelcometheengineersandtechnicians.PLCtakesthegeneralindustrialcontrolcomputer,isfacesIndustrialandminingestablishmentslabortocontroltheequipment.Itsconnectioniseasy,theprogramminglanguageacceptseasyfortheengineersandtechnicians.Thetrapezoidalchartlanguagesgraphicssymbolandtheturnofexpressionandtherelaycircuitdiagramisquiteclose,onlyusesPLCthefewswitchquantitylogicalcontrolinstructiontobepossibletorealizetherelayelectriccircuitsfunctionconveniently.Fornotthefamiliarelectroniccircuit,didnotunderstandthecomputerprincipleandtheassemblylanguagepersonusesthecomputertobeengagedintheindustrialcontroltoopengateoftheconvenience.the2.4systemsdesign,theconstructionworkloadaresmall,maintainconveniently,easytotransform.PLCreplacesthewiringlogicwiththestoredlogic,reducedthecontroldeviceexteriorwiringgreatly,causescontrolsystemdesignandtheconstructioncycleisthereductiongreatly,simultaneouslymaintainsalsobecomeseasy.Causestheidenticalequipmentpossiblytobecomemoreimportantlyafterthealterprocedurechangeproductionprocess.Thisverysuitablemultivarieties,smallbatchproductionsituation.the2.5volumeissmall,theweightislight,theenergyconsumptionislow.TakesubminiaturePLCastheexample,recentlyproducedthevarietybasesizeissmallerthan100mm,theweightissmallerthan150g,thepowerlossonlycountsthetile.Becausethevolumesmallveryeasytoloadinthemachinery,realizestheintegrationofmachineryidealcontroldevice.Sincelong,PLCisintheindustrialautomationcontroldomainthroughoutthemainbattlefield,hasprovidedtheveryreliablecontrolapplicationforvariousautomationcontroldevice.Itcanprovidesafereliableandthequiteperfectsolutionfortheautomatedcontrolapplication,suitsinthecurrentIndustrialenterprisetotheautomatedneed.Sincethe1980s,asaresultofthecomputertechnologyandmicroelectronictechnologysrapidlyexpand,theenormousimpetusPLCdevelopment,thePLCfunctionwhichcausedstrengtheneddaybyday.IfPLCmaycarryonthesimulationquantitycontrol,thepositioncontrolandthePIDcontrolandsoon,easytorealizetheflexiblemanufacturesystem.ThelongdistancecorrespondencefunctionrealizescausesPLCevenmorepowerful.Atpresent,intheadvancedcountries,PLChasbecometheindustrialcontrolthestandardequipment,hascoveredallIndustrialenterprisenearlyusingthesurface.PLCisonekindofsolidstateelectronicinstallation,itusestheprocedurewhichstorestocontrolmachinesmovementorthecraftworkingprocedure.PLCisusesfortosubstitutefortraditionaltheblackwhitecontrol,compareswithit,PLCismoreoutstandingthanintheperformancetheblackwhitecontrollogic,thereliabilityisspeciallyhigh,thedesignconstructioncycleisshort,thedebuggingrevises,moreoverthevolumetobesmallconveniently,thepowerlossislow,theusemaintenanceisconvenient.Therefore,thisarticlehasstudiedbasedontheprogrammablecontrollerPLCelectricmotorsynthesismonitoringandprotectivesystemsmethod.Makestheelectricmotormovementthethreephaseasynchronousmachine.Becausethethreephaseasynchronousmotorrotorsrotationalspeedislowerthantherotaryfieldtherotationalspeed,therotorwindinghastherelativemotionwiththemagneticfield,buttheinducedemfandtheelectriccurrent,andhavetheelectromagnetismtorquewiththemagneticfieldinteraction,realizestheenergyevolution.Compareswiththesinglephaseasynchronousmotor,thethreephaseasynchronousmotorperformancecharacteristicisgood,andmaysaveeachmaterial.Thecrookedsubstructuresdifference,thethreephaseasynchronousmotormaydivideintothecagetypeandwindthreadthetypetwokinds.Thecagetyperotorsasynchronousmotorstructureissimple,themovementisreliable,theweightislight,thepricewascheap,obtainedthewidespreadapplication,itsmajorobjectwasthevelocitymodulationdifficulty.Theregulatingrheostatresistancemayimproveelectricmotorsstartingabilityandadjustelectricmotorsrotationalspeed.Thethreephaseasynchronousmotorwillchangethevoltagenottochangetherotationalspeed,commonlyusedchangesthenumberofpolepairs.Changesthethreephasepowersourcesfrequency.Changesliding,abovetwocommonvelocitymodulationmethod.Thechangenumberofpolepairsneedstolookthattheelectricalmachineryiswhetherappropriate,ifinwerediodeselectricalmachinerycannotchange,afteranotherwasthechange,itsoutputcorrespondinglywillalsochange,wasnotthesteplesschange.Thechangeslidingusescopespeaksthedot,onlyuses,incomparesthehighefficiencytowindthreadontheelectricalmachinery,thesmallelectricalmachinerysrotordoesnotwindthread,changedtherotorinducedemfthefrequencytochangeelectricmotorsrotationalspeed.Moreoverthesimplethemeansarechangeintotheelectricmotortheslipperydifferenceelectricalmachinery,mightthesteplessspeedregulation,becauseinthevelocitymodulationprocess,theelectricalmachineryrotationalspeedwasinvariable,likethisoutputtherotationalspeedtobepossibletomovehasnotaffectedverylowlytotheelectricalmachinery.PLC的特点PLC英文全称ProgrammableLogicController,中文全称为可编程逻辑控制器,定义是一种数字运算操作的电子系统,专为在工业环境应用而设计的。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的特点2.1可靠性高,抗干扰能力强。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,电气接线及开关接点已减少到数百甚至数千分之一,故障也就大大降低。此外,PLC带有硬件故障自我检测功能,出现故障时可及时发出警报信息。在应用软件中,应用者还可以编入外围器件的故障自诊断程序,使系统中除PLC以外的电路及设备也获得故障自诊断保护。这样,整个系统具有极高的可靠性也就不奇怪了。2.2配套齐全,功能完善,适用性强。PLC发展到今天,已经形成了大、中、小各种规模的系列化产品。可以用于各种规模的工业控制场合。除了逻辑处理功能以外,现代PLC大多具有完善的数据运算能力,可用于各种数字控制领域。近年来PLC的功能单元大量涌现,使PLC渗透到了位置控制、温度控制、CNC等各种工业控制中。加上PLC通信能力的增强及人机界面技术的发展,使用PLC组成各种控制系统变得非常容易。2.3易学易用,深受工程技术人员欢迎。PLC作为通用工业控制计算机,是面向工矿企业的工控设备。它接口容易,编程语言易于为工程技术人员接受。梯形图语言的图形符号与表达方式和继电器电路图相当接近,只用PLC的少量开关量逻辑控制指令就可以方便地实现继电器电路的功能。为不熟悉电子电路、不懂计算机原理和汇编语言的人使用计算机从事工业控制打开了方便之门。2.4系统的设计、建造工作量小,维护方便,容易改造。
编号:201311171104085680    大小:37.00KB    格式:DOC    上传时间:2013-11-17
  【编辑】
5
关 键 词:
教育专区 外文翻译 精品文档 外文翻译
温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
0条评论

还可以输入200字符

暂无评论,赶快抢占沙发吧。

当前资源信息

4.0
 
(2人评价)
浏览:9次
英文资料库上传于2013-11-17

官方联系方式

客服手机:13961746681   
2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   

相关资源

相关资源

相关搜索

教育专区   外文翻译   精品文档   外文翻译  
关于我们 - 网站声明 - 网站地图 - 友情链接 - 网站客服客服 - 联系我们
copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5