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外文翻译--工业控制与PLC.doc

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外文翻译--工业控制与PLC.doc

IndustrialControlandPLCIndustrialcontrolautomationtechnologyisanapplicationofcontroltheory,instrumentation,computersandotherinformationtechnology,industrialproductionprocessesfordetection,control,optimization,scheduling,managementanddecisionmaking,toincreaseproduction,improvequality,reduceconsumption,toensurethesafetyThepurposeoftheintegratedtechnology,includingindustrialautomationsoftware,hardwareandsystemsinthree.Industrialcontrolautomationtechnologyasthe20thcentury,theareaofmodernmanufacturingtechnology,oneofthemostimportant,themainsolutiontotheissueofproductivityandconsistency.Althoughtheautomationsystemitselfdoesnotdirectlycreateeffective,butitsproductionprocesstoenhancetheroleofobvious.Chinasindustrialautomationcontrolthepathofdevelopmentaretheintroductionofcompletesetsofequipmenttocarryoutdigestionandabsorptionatthesametime,andthenthedevelopmentandapplicationofasecond.Chinasindustrialcontrolautomationtechnology,industriesandapplicationshavealotofdevelopment,Chinasindustrialcomputersystemsindustryhasbeenformed.Atpresent,industrialcontrolautomationtechnologyistheintelligent,networkbasedandintegrateddirection.TomicroPLC,network,PCandopendevelopmentAlongperiodoftime,PLCinindustrialcontrolautomationhasalwaysbeenthemainbattlefieldofthefieldforawiderangeofautomationcontrolequipmenttoprovidehighlyreliablecontrol,DCSandindustrialPCwithatrendofthethree.Atthesametime,PLCalsosufferfromtheimpactofothertechnologyproducts,especiallyindustrialimpactofPC.Currently,thePLCmanufacturersaroundtheworldabout200,producingover300kindsofproducts.PLCisstillabroad,thedomesticmarketproducts,suchasSiemens,Modicon,AB,OMRON,Mitsubishi,GEproducts.Afteryearsofdevelopment,thedomesticmanufacturersPLCabout30,butthereisnolargescaleproductioncapacityandbrandnameproducts,itcanbesaidPLChasnotyetformedinourmanufacturingindustry.PLCapplicationinChinaisveryactive,theapplicationofawiderangeofindustries.Expertsestimatethatin2000thedomesticmarketsalesofPLCfor1520millionunitsofwhichabout90ofimports,about2535billionyuan,anannualgrowthrateofabout12.Estimatedthatin2005thedemandforNationalPLCwillreachabout250,000units,about3545billionyuan.PLCmarketisalsoreflectedinthestateoftheworldsmanufacturingsector,fellsharplyafter2000.However,inaccordancewiththeAutomationResearchCorpforecasts,despitetheglobaleconomicdownturn,PLCmarketwillrecover,itisestimatedthattheglobalPLCmarketin2000for7.6billionU.S.dollars,bytheendof2005to7.6billionU.S.dollarswillreturnandcontinuetoincreaseslightly.Miniaturization,networking,PCbasedPLCandopennessarethemaindirectionsoffuturedevelopment.PLCbasedautomationintheearly,PLCbulkyandexpensive.However,inrecentyears,microPLClessthan32I/Ohasoccurred,thepriceonlyafewhundredeuros.WiththesoftPLCSoftPLCcontrolconfigurationsoftwaretofurtherimproveanddevelop,isequippedwithsoftPLCconfigurationsoftwareandPCbasedcontrolofthemarketsharewillgraduallyincrease.Atpresent,thefieldofprocesscontrol,oneofthebiggesttrendsistheexpansionofEthernettechnology,PLCisnoexception.PLCisnowagrowingnumberofsuppliersprovidingEthernetinterface.Itisbelievedthat,PLCwillcontinuetoopenthedirectionofthetransferofcontrolsystems,especiallyPCbasedindustrialcontrolsystems.SourceIndustrialNetworkSmallsize,diversification,PCandopenthefuturedevelopmentdirectionofDCS.DCSiscurrentlyasmallmarketsharehasbeengraduallyandPLC,industrialPC,FCSsharing.Firstofall,thefuturemaybesmallscaleDCSsystemwiththeintegrationofthesethree,andsoftDCStechnologywillfirstbedevelopedsmallscaleDCS.PCbasedcontrolwillbemorewidelyusedinsmallandmediumsizedprocesscontrol,theDCSwillalsobevendorshavebeenofferingPCbasedsmallscaleindustrialDCSsystems.OpentotheDCSsystematthesametimetwowayupwardanddownwardextensionoftheproductionprocessfromfielddataacrosstheenterprisewithinthefreeflowofinformationtechnologyandcontroltechnology,seamlesslyintegratedtocontrolthedirectionofthedevelopmentofmonitoringandcontrol.Informationtechnologyindustryisdefinedasindustrialproduction,management,businessprocess,throughtheinformationinfrastructure,inanintegratedplatformofinformationacquisition,informationtransmission,informationprocessingandcomprehensiveutilizationofsuchinformation.Todevelopasaresultofindustrialautomationistospeedupthetransformationoftraditionalindustriestoupgradeandimprovetheoverallqualityofenterprises,improvethecountrysoverallnationalstrength,adjustingtheindustrialstructure,toinvigoratelargeandmediumsizedenterprises,therapidandeffectivewaysandmeans,thestatewillcontinuethroughtheimplementationofaseriesofhightechindustryofindustrialprocessautomationofspecial,usinginformationtechnologytostimulateindustrializationandthepromotionofindustrialautomationtechnologytofurtherdevelopandstrengthentechnologicalinnovation,toachieveindustrializationandeconomicdevelopmenttosolvetheunderlyingproblem,tofurtherimprovetheoverallqualityofthenationaleconomyandoverallnationalstrength,thedevelopmentbyleapsandbounds.Todevelopasaresultofindustrialautomationistospeedupthetransformationoftraditionalindustriestoupgradeandimprovetheoverallqualityofenterprises,improvethecountrysoverallnationalstrength,adjustingtheindustrialstructure,toinvigoratelargeandmediumsizedenterprises,therapidandeffectivewaysandmeans,thestatewillcontinuethroughtheimplementationofaseriesofhightechindustryofindustrialprocessautomationofspecial,usinginformationtechnologytostimulateindustrializationandthepromotionofindustrialautomationtechnologytofurtherdevelopandstrengthentechnologicalinnovation,toachieveindustrializationandeconomicdevelopmenttosolvetheunderlyingproblem,tofurtherimprovetheoverallqualityofthenationaleconomyandoverallnationalstrength,thedevelopmentbyleapsandbounds.工业控制与PLC工业控制自动化技术是一种运用控制理论、仪器仪表、计算机和其它信息技术,对工业生产过程实现检测、控制、优化、调度、管理和决策,达到增加产量、提高质量、降低消耗、确保安全等目的的综合性技术,主要包括工业自动化软件、硬件和系统三大部分。工业控制自动化技术作为20世纪现代制造领域中最重要的技术之一,主要解决生产效率与一致性问题。虽然自动化系统本身并不直接创造效益,但它对企业生产过程有明显的提升作用。我国工业控制自动化的发展道路,大多是在引进成套设备的同时进行消化吸收,然后进行二次开发和应用。目前我国工业控制自动化技术、产业和应用都有了很大的发展,我国工业计算机系统行业已经形成。目前,工业控制自动化技术正在向智能化、网络化和集成化方向发展。PLC在向微型化、网络化、PC化和开放性方向发展长期以来,PLC始终处于工业控制自动化领域的主战场,为各种各样的自动化控制设备提供非常可靠的控制方案,与DCS和工业PC形成了三足鼎立之势。同时,PLC也承受着来自其它技术产品的冲击,尤其是工业PC所带来的冲击。目前,全世界PLC生产厂家约200家,生产300多种产品。国内PLC市场仍以国外产品为主,如Siemens、Modicon、AB、OMRON、三菱、GE的产品。经过多年的发展,国内PLC生产厂家约有三十家,但都没有形成颇具规模的生产能力和名牌产品,可以说PLC在我国尚未形成制造产业化。在PLC应用方面,我国是很活跃的,应用的行业也很广。专家估计,2000年PLC的国内市场销量为1520万套(其中进口占90左右),约2535亿元人民币,年增长率约为12。预计到2005年全国PLC需求量将达到25万套左右,约3545亿元人民币。PLC市场也反映了全世界制造业的状况,2000后大幅度下滑。但是,按照AutomationResearchCorp的预测,尽管全球经济下滑,PLC市场将会复苏,估计全球PLC市场在2000年为76亿美元,到2005年底将回到76亿美元,并继续略微增长。微型化、网络化、PC化和开放性是PLC未来发展的主要方向。在基于PLC自动化的早期,PLC体积大而且价格昂贵。但在最近几年,微型PLC(小于32I/O)已经出现,价格只有几百欧元。随着软PLC(SoftPLC)控制组态软件的进一步完善和发展,安装有软PLC组态软件和PCbased控制的市场份额将逐步得到增长。

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