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基于PLC的邮件分拣系统的设计.pdf

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基于PLC的邮件分拣系统的设计 nthe20thcentury。asaXXX。thePLC(programmable logiccontroller)haseoneofthethreepillarsofmodernindustrial XXX。whichisthebiggestadvantageofPLC。Asanewtypeof industrialcontroller。PLCisXXXindustry。chemicalindustry。 powerindustry。XXX。mechanicalprocessing。andfood processing。InordertoexplorethenofPLCinthemailsorting controlsystem。thisprojectwilluseS7-200PLCtostudythemail sortingsystem. Thedesignofthisprojectisandesignofthemailsorting system。anditscontrolcoredeviceisS7-200PLC。Theoverall designincludeshardwareandaredesign。Thehardwaredesignof thesystemmainlyachievesmailsorting。Thearedesignofthe systemcontrolsthenoftheentiresystemthroughPLC programming。ThemaincontrollerPLCanalyzestheedited program。andthenXXX. Keywords:relay。controlsystem。ladderdiagram。mail sorting ThePLC。alsoknownastheprogrammedcontroller。XXX developmentinthe20thcentury。Ithaseoneofthethreepillars ofmodernindustrialXXXPLCgraduallyreplacedthewidespread useofrelays。simplifiedcontrolcircuits。andimprovedsystem reliability。makingitthebiggestadvantageofthePLC。Thisnew typeofindustrialcontrollerhasawiderangeofnsinmanyareas。 includingthemetallurgicalindustry。chemicalindustry。power industry。XXX。machineryprocessing。andfoodprocessing. Inthisarticle。wewillexplorethenofthePLCintheXXX。 wewillfocusontheS7-200PLCcontrolsystemoftrafficlights。 ThissystemisanexcellentexampleofhowthePLCcanbeusedto improvetrafficflowandsafety. Tobegin。let'stakeacloserlookattheadvantagesofthe PLC。OneofthemainadvantagesisXXX-basedsystems。the PLCusesasingleprocessortocontrolallthensofthesystem。 Thisnotonlysimplifiesthewiringandcesthesizeofthecontrol。 butitalsomakesthesystemXXX. AnotheradvantageofthePLCisitsXXXprogramming languageusedinthePLCallowsforcomplexXXX。makingit XXX。thePLCcanbeXXX. Inthecaseofthetrafficlightscontrolsystem。theS7-200 PLCisusedtocontroltheXXXofthetrafficlights。Thissystem isXXXofthelightsbasedontrafficvolumeandpatterns。The S7-200PLCisprogrammedtomonitortrafficflowandadjust XXX。XXX.