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

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--PLC基础知识简介.doc

  • 资源星级:
  • 资源大小:43.00KB   全文页数:8页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--PLC基础知识简介.doc

1PLCelementaryknowledgesynopsisIntheautomatedcontroldomain,PLCisonekindofimportantcontroldevice.Atpresent,intheworldhasmorethan200factoriestoproducemorethan300varietiesPLCproduct,appliesintheautomobile23,thegrainprocessing16.4,chemistry/drugsmanufacture14.6,themetal/mine11.5,thepaperpulp/papermaking11.3andsoontheprofession.InordertomakefellowbeginnersconvenientlytounderstandPLC,thisarticletothePLCdevelopment,thebasicstructure,thedisposition,usingandsoontheelementaryknowledgemakesasynopsis.First,PLCdevelopmentcourseIntheindustrialproductionprocess,themassiveswitchesquantitysequentialcontrol,itcarriesonthesmoothmovementaccordingtothelogicalcondition,anddeferstothelogicalrelationstocarryonthechainlikeprotectionmovementthecontrol,andmassivedataacquisition.Inthetradition,thesefunctionsarerealizethroughairoperatedortheelectricitycontrolsystem.In1968AmericanGMgeneralautomobilethecompanyproposedthesubstitutioncontinuestheelectricitycontroldevicetherequest,thesecondyear,theAmericannumeralcompanydevelopedbasedontheintegratedcircuitandtheelectronictechnologycontroldevice,usedsequencedthemethodtoapplyforthefirsttimetotheelectricalcontrol,thiswasthefirstgenerationofprogrammableforewordcontroller,calledProgrammableControllerPC.AfterthepersonalcomputeriscalledPCtodevelop,inordertobeconvenient,alsoinordertoreflecttheprogrammablecontrollerthefunctioncharacteristic,theprogrammableforewordcontrollerchoosesanameisProgrammableLogicControllerPLC,now,stillfrequentlywascalledPLCPC.ThePLCdefinitionhasmanykinds.TheinternationalelectriciancommitteeIECtoPLCthedefinitionisTheprogrammablecontrollerisonekindofdigitaloperationoperationelectronicsystem,speciallyforappliesundertheindustryenvironmentdesigns.Itusestheprogrammableforewordthememory,usesfortocarryoutthelogicoperation,thesequentialcontrolinitsinternalstorage,fixedtime,countswithoperationtheandsoonarithmeticoperationinstruction,andthroughdigital,thesimulationinputandtheoutput,controlseachkindoftypethemachineryortheproductionprocess.Theprogrammableforewordcontrolleranditstherelatedequipment,allshouldaccordingtoeasyformawholewiththeindustrycontrolsystem,2iseasytoexpanditsfunctiontheprincipledesign.Onthecentury80stothe90sintermediatestages,arePLCdevelopthequickesttime,theyearlyratecontinuouslymaintenanceare3040.Inthistime,PLCintheprocessingsimulationquantityability,thedigitaloperationability,themanmachineconnectionabilityandthenetworkingcapabilityobtainsthelargescaleenhancement,PLCgraduallyenterstheprocesscontroldomain,substitutedincertainapplicationshasbeenatthedominantpositionintheprocesscontroldomaintheDCSsystem.PLChastheversatilitystrongly,theeasytooperate,theadaptionsurfacebroad,thereliabilityhigh,theantijammingabilitystrong,theprogrammingissimpleandsoonthecharacteristic.PLCintheindustrialautomationcontrolspeciallyisinthesequentialcontrolstatus,infuturewhichmayforesee,isunabletosubstitute.Second,PLCconstitutionFromthestructuretheminute,PLCdividesintothestationarytypeandthecombinedtypemoduletypetwokinds.StationaryPLCincludingtheCPUboard,theI/Oboard,demonstratedthekneadingboard,thememoryblock,thepowersourceandsoon,theseelementgroupssynthesizeanotdismantablewhole.ModuletypePLCincludingtheCPUmodule,theI/Omodule,thememory,thepowersourcemodule,theledgerwallortherack,thesemodulesmaydefertothecertainrulecombinationdisposition.Second,PLCconstitution.Third,CPUconstitutionCPUisthePLCcore,playsnervecentersrole,everytimewrapsPLCatleasttohaveCPU,itfunctionreceiveandstorageuserprogramanddatawhichentrustswithaccordingtothePLCsystemprogram,withscanningwaygatheringtheconditionorthedatawhichsendsbythesceneinputdevice,andstoresthestipulationintheregister,simultaneously,diagnosesthepowersourceandinthePLCinternalcircuitactivestatusandtheprogrammingprocessgrammaticalerrorandsoon.Afterentersthemovement,readsfromtheuserprogrammemorybythestriptakestheinstruction,thedutywhichstipulatedaccordingtotheinstructionproducesthecorrespondingcontrolsignalagainaftertheanalysis,directstherelatedcontrolcircuit.CPUmainlybythelogicunit,thecontroller,theregisterandrealizesthedata,thecontrolandtheconditionmainlineconstitutionwhichbetweenthemrelates,theCPUunitalsoincludestheperipherychip,themainlineconnectionandtherelatedelectriccircuit.Thememorymainlyusesinthestoredroutineandthedata,isthePLCessentialcompositionunit.Lookedlikeintheuser,nonessentialmultianalysisCPUinternalcircuit,butor3shouldhavetheenoughunderstandingtoeachpartofworkmechanism.TheCPUcontrollercontrolstheCPUwork,readsbyittakestheinstruction,theinterpretiveorderandcarriesouttheinstruction.Buttheworkrhythmbyshakesthesignalcontrol.Thelogicunitusesintocarryonthenumeralorthelogicoperation,worksunderthecontrollerdirection.Theregisterparticipationoperation,coexistsstorestheoperationtheintermediateresult,italsoisworksunderthecontrollerdirection.TheCPUspeedandthememorycapacityarethePLCimportantparameter,theyaredecidingthePLCworkingspeed,theIOquantityandthesoftwarecapacityandsoon,thereforeislimitingthecontrolscale.Fourth,I/OmodulePLCandtheelectricalreturnrouteconnection,isI/Ocompletesthroughtheinputoutputunit.TheI/OmoduleintegratedthePLCI/Oelectriccircuit,itsinputtemporarystoragedevicereflectioninputsignalcondition,outputpointreflectionoutputlatchcondition.TheloadmoduletransformstheelectricalsignalthedigitalsignaltoenterthePLCsystem,theoutputmoduleisopposite.I/OdividesintotheswitchquantityinputDI,switchquantityoutputDO,simulationquantityinputAI,simulationquantityoutputAOandsoonmodule.Theswitchquantityisrefershasandclosesor1and0twokindofconditionssignals,thesimulationquantityisonlyaquantitywhichreferscontinuouslychanges.CommonlyusedI/OclassifiesasfollowsSwitchquantityDividesequallyaccordingtothevoltagewater,has220VAC,110VAC,24VDC,dividesaccordingtotheisolationway,hastherelayisolationandthetransistorisolation.SimulationquantityDividesaccordingtothesignaltype,hastheelectriccurrent420mA,020mA,thevoltage010V,05V,1010Vandsoon,dividesaccordingtotheprecision,has12bit,14bit,16bitandsoon.BesidesabovegeneralI/O,butalsohasthespecialI/Omodule,likemoduleandsoonthermalresistance,thermoelement,pulse.AccordingtotheI/Opointsdeterminationmodulespecificationandthequantity,theI/Omodulemaybemanymaybefew,butitsbiggestnumberthebasicdispositionabilitywhichcanmanageCPU,namelybiggestledgerwallorrackKeyslotnumberlimit.Fifth,powersourcemoduleThePLCpowersourceusesinisthePLCvariousmodulesintegratedcircuitprovidestheworkpowersource.Atthesametime,somealsoprovides24Vforthe4inputcircuittheworkpowersource.ThemainsinputtypeincludesWhatthealternatingcurrentsupply220VACor110VAC,thedirectcurrentpowersupplyiscommonlyusedis24VAC.Sixth,ledgerwallorrackThemajoritymoduletypePLCuseledgerwallortherack,itsfunctionisOntheelectricity,realizesduringvariousmodulesrelation,enablesCPUtovisitontheledgerwallallmodules,onthemachinery,realizesduringvariousmodulesconnection,enablevariousmodulestoconstituteawhole.Seventh,PLCsystemotherequipment1st,programstheequipmentTheprogrammingisthePLCdevelopmentapplication,themonitormovement,theinspectionmaintainstheessentialcomponent,usesintoprogram,makessomehypothesestothesystem,monitorsthesystemworkingconditionwhichPLCandPLCcontrols,butitnotdirectlyparticipatesinthescenecontrolmovement.SmallprogrammingPLCgenerallyhasthegraspingprogramming,atpresentgenerallymovementprogrammingsoftwareactsastheprogrammingbythecomputer.2nd,manmachinecontactsurfaceThesimplestmanmachinecontactsurfaceistheindicatinglampandthebutton,atpresenttheliquidcrystalscreenortouchesscreenaformulawritingstyleoperatorterminalapplicationtobemoreandmorewidespread,movementconfigurationsoftwareactsasthemanmachinecontactsurfacebythecomputerextremelytopopularize.3rd,inputoutputdeviceUsesinpermanentlythememoryuserdata,likeEPROM,EEPROMreadingin,barcodemicroreader,inputsimulationquantitypotentiometer,printerandsoon.Eighth,PLCcorrespondencenetworkingDependsupontheadvancedindustrynetworktechnologytobeallowedrapidlyeffectivelytocollect,thetransmissionproducesandmanagesthedata.Therefore,thenetworkismoreandmoreremarkableintheautomatedsystemintegrationprojectimportance,evensomepeopleproposedthenetworkisthecontrollerviewpointview.PLChasthecorrespondencenetworkingthefunction,itcausesbetweenPLCandPLC,PLCandonbetweenthepositioncomputerandallthatintelligentequipmentcanexchangetheinformation,formsaunifiedwhole,therealizationdispersercommoncontrol.MostPLChastheRS232connection,butalsohassomeinsetshassupportsrespectivecorrespondenceagreementtheconnection.

注意事项

本文(外文翻译--PLC基础知识简介.doc)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5