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1、USBinIndustrialApplicationsForindustrialautomationusers,technologygivethandtakethaway.Ononehandadvancesinsemiconductorsandsoftwareresultinsmarterandmorecapablecomputersandmachines,makingthejobofautomatingaprocesseasierandmorerobust.Ontheotherhandthosesameadvancescanspelltrouble.Automat
2、ionproductshavelonglifetimesthataremeasuredindecadesandnotyears.Soadvancesintechnology一particularlyPCtechnology一maymeanthatautomationproductsandapplicationshavetochange,sometimespainfully.Thequestionforindustrialusersthenbecomeswhatchangeshouldbemade?Andwhatcanbedonetoavoidarepeatofthi
3、sprobleminthefuture?ConsiderthePC5sinternalbus,theelectricalpathwayused,inpart,forcommunicationwiththeoutsideworld.Atthistimeandforthatcase,AdvantechbelievestheanswertobothquestionsistheaptlynamedUniversalSerialBusorUSB.ThisbuschangeinindustrialPCsisaresultofchangesinthelargermarket.Cu
4、rrently,PCI-ExpressisonitswaytobecominganewbackplanestandardforPCs・Soautomationusersarefacedwiththeprospectofchanginghowtheirdevicesinterfacewithindustrialcomputers.Asanaddedtwist,embeddedprocessorboardsareincreasinglypopularandfrequentlytheseboardscomewithnoextendablebus,eitherPCI-Exp
5、ressbasedoronebasedonanotherstandard.Forexample,astudybyVentureDevelopmentCorp,ofNatick,Mass,predictedtheshareofshipmentsoflargerformfactorembeddedboards,thoselargerthan70squareinches,willdeclineby9.7percentfrom2004to2008whiletheoverallmarketgrowsbynearly12percentindollarvolumeshipment
6、soverthesametimeperiod.ThegrowthwillcomefromboardshavingonlyUSBportsandnoextendablebus.Anysolutiontothisbuspredicamentmustenablecommunicationthatishighspeed,deterministic,robust,andcapableofcoveringtheneededdistanee.Thesolutionalsomustbuilduponalonglivedstandardthatisuniversallyavailab
7、le.USBmeetstheserequirements.VirtuallyallindustrialcomputersshipwithmultipleUSBportsandthey'reonmanyotherindustrialdevicesaswell・USBhasthenecessaryspeedandmilliseconddeterminism,morethanenoughforalmostallindustrialusers.Withsomemodifications,particularlyintheareasofsecuringconnection
