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1、外文翻译院（系）专业班级姓名学号指导教师Programmabledesignedforelectro・pneumaticsystemscontrollerJohnF.WakerlyThisprojectdealswiththestudyofelectro-pneumaticsystemsandtheprogrammablecontrollerthatprovidesaneffectiveandeasywaytocontrolthesequenceofthepneumaticactuatorsmovementandt
2、hestatesofpneumaticsystem.Theprojectofaspecificcontrollerforpneumaticapplicationsjointhestudyofautomationdesignandthecontrolprocessingofpneumaticsystemswiththeelectronicdesignbasedonmicrocontrollerstoimplementtheresourcesofthecontroller.1.1ntroductionTheautoma
3、tionsystemsthatuseelectro-pneumatictechnologyareformedmainlybythreekindsofelements:actuatorsormotors,sensorsorbuttonsandcontrolelementslikevalves.Nowadays,mostofthecontrolelementsusedtoexecutethelogicofthesystemweresubstitutedbytheProgrammableLogicController(P
4、LC).Sensorsandswitchesarepluggedasinputsandthedirectcontrolvalvesfortheactuatorsarepluggedasoutputs.Aninternalprogramexecutesallthelogicnecessarytothesequenceofthemovements,simulatesothercomponentslikecounter,timerandcontrolthestatusofthesystem.Withtheuseofthe
5、PLC,theprojectwinsagility,becauseitispossibletocreateandsimulatethesystemasmanytimesasneeded.Therefore,timecanbesaved,riskofmistakesreducedandcomplexitycanbeincreasedusingthesameelements.AconventionalPLC,thatispossibletofindonthemarketfrommanycompanies,offersm
6、anyresourcestocontrolnotonlypneumaticsystems,butallkindsofsystemthatuseselectricalcomponents.ThePLCcanbeveryversatileandrobusttobeappliedinmanykindsofapplicationintheindustryorevensecuritysystemandautomationofbuildings.Becauseofthosecharacteristics,insomeappli
7、cationsthePLCofferstomuchresourcesthatarenotevenusedtocontrolthesystem,electro-pneumaticsystemisoneofthiskindofapplication.TheuseofPLC，especiallyforsmallsizesystems,canbeveryexpensivefortheautomationproject.Analternativeinthiscaseistocreateaspecificcontrollert
8、hatcanoffertheexactlysizeandresourcesthattheprojectneeds[3，4].Thiscanbemadeusingmicrocontrollersasthebaseofthiscontroller.Thecontroller,basedonmicrocontroller,canbeveryspecificanda
