1、IndustrialControlandPLCIndustrialcontrolautomationtechnologyisanapplicationofcontroltheory/instrumentation/computersandotherinformationtechnology/industrialproductionprocessesfordetection/control/optimization/scheduling/managementanddecision-making/toincreaseproduction/improvequality/reduceconsumpti
2、on/toensurethesafetyThepurposeoftheintegratedtechnology/includingindustrialautomationsoftware/hardwareandsystemsinthree/Industrialcontrolautomationtechnologyasthe20thcentury/theareaofmodernmanufacturingtechnology/oneofthemostimportant/themainsolutiontotheissueofproductivityandconsistency/Althoughthe
3、automationsystemitselfdoesnotdirectlycreateeffective/butitsproductionprocesstoenhancetheroleofobvious/Chinasindustrialautomationcontrolthepathofdevelopmentaretheintroductionofcompletesetsofequipmenttocarryoutdigestionandabsorptionatthesametime/andthenthedevelopmentandapplicationofasecond/Chinasindus
4、trialcontrolautomationtechnology/industriesandapplicationshavealotofdevelopment/Chinasindustrialcomputersystemsindustryhasbeenformed/Atpresent/industrialcontrolautomationtechnologyistheintelligent/network-basedandintegrateddirection/Tomicro-PLC/network/PCandopendevelopmentAlongperiodoftime/PLCinindu
5、strialcontrolautomationhasalwaysbeenthemainbattlefieldofthefieldforawiderangeofautomationcontrolequipmenttoprovidehighlyreliablecontrol/DCSandindustrialPCwithatrendofthethree/Atthesametime/PLCalsosufferfromtheimpactofothertechnologyproducts/especiallyindustrialimpactofPC/Currently/thePLCmanufacturer
6、saroundtheworldabout200/producingover300kindsofproducts/PLCisstillabroad/thedomesticmarketproducts/suchasSiemens/Modicon/AB/OMRON/Mitsubishi/GEproducts/Afteryearsofdevelopment/thedomesticmanufacturersPLCabout30/butthereisnolarge-scaleproductioncapacityandbrand-nameproducts/itcanbesaidPLChasnotyetfor
7、medinourmanufacturingindustry/PLCapplicationinChinaisveryactive/theapplicationofawiderangeofindustries/Expertsestimatethatin2000thedomesticmarketsalesofPLCfor15(20millionunits(ofwhichabout90%ofimports)/about25(35billionyuan/anannualgrowthrateofabout12%/Estimatedthatin2005thedemandforNationalPLCwillr
8、eachabout250/000units/about35(45billionyuan/PLCmarketisalsoreflectedinthestateoftheworldsmanufacturingsector/fellsharplyafter2000/However/inaccordancewiththeAutomationResearchCorpforecasts/despitetheglobaleconomicdownturn/PLCmarketwillrecover/itisestimatedthattheglobalPLCmarketin2000for7/6billionU/S
9、/dollars/bytheendof2005to7/6billionU/S/dollarswillreturnandcontinuetoincreaseslightly/Miniaturization/networking/PC-basedPLCandopennessarethemaindirectionsoffuturedevelopment/PLC-basedautomationintheearly/PLCbulkyandexpensive/However/inrecentyears/micro-PLC(lessthan32I/O)hasoccurred/thepriceonlyafew
10、hundredeuros/WiththesoftPLC(SoftPLC)controlconfigurationsoftwaretofurtherimproveanddevelop/isequippedwithsoft-PLCconfigurationsoftwareandPC-basedcontrolofthemarketsharewillgraduallyincrease/Atpresent/thefieldofprocesscontrol/oneofthebiggesttrendsistheexpansionofEthernettechnology/PLCisnoexception/PL
11、CisnowagrowingnumberofsuppliersprovidingEthernetinterface/Itisbelievedthat/PLCwillcontinuetoopenthedirectionofthetransferofcontrolsystems/especiallyPC-basedindustrialcontrolsystems/(Source/IndustrialNetwork)Smallsize/diversification/PCandopenthefuturedevelopmentdirectionofDCS/DCSiscurrentlyasmallmar
12、ketsharehasbeengraduallyandPLC/industrialPC/FCSsharing/Firstofall/thefuturemaybesmall-scaleDCSsystemwiththeintegrationofthesethree/andsoftDCStechnologywillfirstbedevelopedsmall-scaleDCS/PC-basedcontrolwillbemorewidelyusedinsmallandmedium-sizedprocesscontrol/theDCSwillalsobevendorshavebeenofferingPC-
13、basedsmall-scaleindustrialDCSsystems/OpentotheDCSsystematthesametimetwo-wayupwardanddownwardextensionoftheproductionprocessfromfielddataacrosstheenterprisewithinthefreeflowofinformationtechnologyandcontroltechnology/seamlesslyintegratedtocontrolthedirectionofthedevelopmentofmonitoringandcontrol/Info
14、rmationtechnologyindustryisdefinedasindustrialproduction/management/businessprocess/throughtheinformationinfrastructure/inanintegratedplatformofinformationacquisition/informationtransmission/informationprocessingandcomprehensiveutilizationofsuchinformation/Todevelopasaresultofindustrialautomationist
15、ospeedupthetransformationoftraditionalindustriestoupgradeandimprovetheoverallqualityofenterprises/improvethecountrysoverallnationalstrength/adjustingtheindustrialstructure/toinvigoratelargeandmedium-sizedenterprises/therapidandeffectivewaysandmeans/thestatewillcontinuethroughtheimplementationofaseri
16、esofhigh-techindustryofindustrialprocessautomationofspecial/usinginformationtechnologytostimulateindustrializationandthepromotionofindustrialautomationtechnologytofurtherdevelopandstrengthentechnologicalinnovation/toachieveindustrializationandeconomicdevelopmenttosolvetheunderlyingproblem/tofurtheri
17、mprovetheoverallqualityofthenationaleconomyandoverallnationalstrength/thedevelopmentbyleapsandbounds/Todevelopasaresultofindustrialautomationistospeedupthetransformationoftraditionalindustriestoupgradeandimprovetheoverallqualityofenterprises/improvethecountrysoverallnationalstrength/adjustingtheindu
18、strialstructure/toinvigoratelargeandmedium-sizedenterprises/therapidandeffectivewaysandmeans/thestatewillcontinuethroughtheimplementationofaseriesofhigh-techindustryofindustrialprocessautomationofspecial/usinginformationtechnologytostimulateindustrializationandthepromotionofindustrialautomationtechn
19、ologytofurtherdevelopandstrengthentechnologicalinnovation/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、
20、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
21、，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、A-B、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15(20万套
22、（其中进口占90%左右），约25(35亿元人民币，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35(45亿元人民币。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PC-based控制的市场份额将逐步得到增长。
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