全文预览已结束
下载本文档
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
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
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,对用户上传分享的文档内容本身不做任何修改或编辑,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。
最新文档
- 防晒服行业消费者偏好调研分析报告
- 低碳经济背景下产业转型策划报告
- 初中期中考试总结18篇
- 上半年幼儿园工作总结15篇
- 跨部门沟通协调机制建立与优化计划
- 人教版四年级数学上册《 整十数除两、三位数的笔算》
- 2022-2023年度陕西省安全员之C1证(机械安全员)能力测试试卷A卷附答案
- 企业会计制度及税法的差异分析
- 企业会计核算的相关性原则
- 企业捐赠税收优惠研究
- 奥数班五年级下册第15讲-等高模型进阶课件
- (医学)儿童生长发育迟缓教学课件
- 设计基础高职PPT完整全套教学课件
- 木模工安全操作规程
- 对外投资合作国别(地区)指南 -加纳
- 2023年护理学期末复习-急危重症护理学(本护理)考试历年高频试卷精华版题库(含答案)
- 烧结砖瓦行业企业分级管控绩效
- 2023学年完整公开课版《轻松考试》
- 四川2023年兴业银行成都分行社会招聘(412)考试参考题库含答案详解
- 《机械基础》课后习题答案
- 住院精神疾病患者攻击行为预防-2023中华护理学会团体标准
评论
0/150
提交评论