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ThelatestDevelopmentofPLC1IntroductionForalongtime,PLCwillalwaysbeinthefieldofindustrialautomationandcontrolthemainbattlefieldforavarietyofautomatedcontrolequipmenttoprovideaveryreliablecontrolapplications.Themainreasonisthatitcanprovidefortheautomationcontrolapplicationssafe,reliableandrelativelyperfectsolutionforthecurrentindustrialenterprisesinautomationneeds,Ontheotherhand,PLCmustalsorelyonothernewtechnologiestodealwithshrinkingmarketsharegraduallybroughtaboutbytheimpact,inparticularthePCindustrybroughtaboutbytheimpact.PLCneedtoaddresstheproblemstillistheintroductionofnewtechnology,thesystemofopenandprices.PLCtechnologyexhibitionistheultimatetrendthatpeoplearestillthefocusofcontroversy.MostpeoplethinkPLCwillcontinuetolosemarketshare;Whatismore,inthefaceofindustrialPC,PLCwillbesteptowardsdeath,buttherearesomepeoplebelievethatsomespecialindustrialapplicationsforthePLCwillcontinuetoprovideacertainmarketshare.Intheglobalindustrialcomputer—controlledareas,andre—openaroundtheopenprocesscontrolsystem,openprocesscontrolsoftware,datacommunicationprotocolandopeningup,enormouschangeshavetakenplacealmosteverywherePLC,butthistrendmaynotcontinuetodevelop.withthesoftPLC(SoftPLC)configurationcontrolsoftwaretechnologyandthebirthoffurtherimprovementanddevelopment,installationandconfigurationsoftwareisSoftPLCPC—basedindustrialcontrolsystem’smarketshareisgraduallygrowing,thefactthattraditionalsuppliersintermsofideologyPLCHaveplaceinthedramaticchange,theymustfacethereality,thetraditionalPLCtechnologydevelopmentandraisingmoreopentomakeahigh—profile.Thecontrolsoftware,thisisthecoreofPLCcontroller,PLCprovidersareavailabletoindustrialusersofopenprogrammingconfigurationtools,butalsoforindustrialuserswasverypositive.Inaddition,opencommunicationnetworktechnologyhasbeenabreakthrough,theresultisthePLCintoamoreopenindustrialcontrolindustries.2openandPC—basedindustrialcontrolPLCmanufacturershavestartedwatchingPC—basedindustrialcontroltechnologybroughtaboutbythepowerfulimpact.SomeexpertsevenbelievethatthenewbusinessbroughtaboutbynewtechnologyandopentechnicalspecificationswillbeburiedtraditionalPLC.PLCmanufacturersthat,althoughintheindustrialfieldinstallationofalargenumberofPLCcontrolequipment,buttheystillneedtheJointControlsoftwarecompaniestodeveloptheirownPC—basedindustrialprocesscontrolsoftware.ItistruethatafewyearsagointheindustrialsceneobviouslythereisamixoftheoldandthenewPLC,industrialusershavetolearnedtotheoldandnewknowledge,learningandevenlearnfromeachother.ThemajorityofPLCmanufacturersforindustrialusersprovideonlyasoftlogicandaplatform.Inthehigh—endapplications,itisdifficulttodistinguishbetweenPLCcontrolsystemandindustrialPCcontrolsystemthedifferencebetween,becauseitbothfollowedthesametypesofmicroprocessorsandmemorychips.Playtheimageofananalogy,ifyouforgettheindustrialPCliteralmeaningofthosewordsthentheboxcanobservedthatthemoreitisthecomplexityofthosebasicskillsandthemixtureofthesetechnologiestobeeffectiveincombinationtocontrolsystem.Inaddition,theadoptionofthereasonsforthecontrolsystemfunctionsontheonehandistheneedforintegration,ontheotherhandalsobecausesomeindustrialuserstofunctionduetoexcessivelydemanding.Ifwecangiveahighdegreeofattention,wecangetmoreofthebasictechnicalknowledge,PLCmanufacturerstofocusonsystemfunctions,whileindustrialuserswillfocusonsystemapplicationsPeoplecanseethatthefurthertrendofdevelopmentistofurtherintegratemorefunctionstoacontrolbox.Asaresultsequencecontrolandprocesscontrolsuchincidentswillbeusedfunctionalapproachtodealwith,liketheotherspotscanalsosharecontrolofthecontrolstructuretothesamesystem.ItisbelievedPLCtechnologywillcontinuetoopenthedirectionoftransfercontrolparticular,thePC-basedindustrialcontrolsystems.ThelateradditiontotheflexibilitythantraditionalPLChasdistinctadvantages,butalsohasotheradvantages,suchasthesystemcanbeshortenedtohitthemarketcycle,lowersystemcostofinvestment,improvethebottomfromthefactorytothecorporateofficeautomationefficiencyofdataflowofinformationAndsoon.OnindustrialPCcontrolsystemforreal-timeresponsehasbeenverygoodsolution,perhapsthemainthingisstillhiddenbehindintechnology,butthelackofcorrespondingtrackrecord.ThePLCspeaking,thestrengthofoneofitsmainfeatures,thisisalreadyaconsiderablenumberoftrackrecordstoverify.IndustrialuserswillstilltreatverycarefullyPLC,theyaredifferentfromthePLCforthetechnicaltests.Intheuseofanewtechnology,industrialusersneedconsiderthequestionofhowmuchistaketherisk,andtheneedtoconsidertheirbusinessactivitiescanbringthenumberofopportunitiesandbenefits.However,industrialusersarenotcompletelybelievethatopen-controlsystembroughtaboutbythebenefits.Withthefurtherdevelopmentoftechnology,theybegantograduallyreducetheseideasandconcepts.Industrialusersarebalancedbytheintroductionofnewtechnologyandtheriskstotheirbusinessactivitiesbroughtaboutbytheproceedsfromthefuturedecision-makinginordertoprovideeffectiveprotection.IndustrialPCtechnologyoffersmanyfeaturestoenhancethePLCfeatures,includingcontainingdigitalvideoandhigh-speedfloating-pointcoprocessor.AlthoughMicr