PLC物料自动分拣系统毕业设计外文文献翻译

pplications.HYet,themajorityofvendorswesurveyeddon'tlikethe"PCinvasion11willposeaproblemforthem.MostsaidthatPLCsandPCsareenoughapartinarchitecturethattheywillusuallydothecontrol.TheydorftfeelthatPCswilltakejobsfromPLCsjustbecausePLCI/OmodulescannowbeconnectedtoPCs;theybelievethissimplymeansthatPLCsandPCswillbeabletosharethesamedata."puterJsaysRichRyan,”andaprogrammablecontroller.TherearehardwareconstructsbuiItintoalmosteverymanufacturedprogrammablecontrollertodaythatcustomizethehardwaretorunladderlogicandtosolvemachinecode・"Onefundamentaldifferencehecitesiscalledstateofthemachine.Ryan:"Whenyoushutthemachineoff,orinteiTuptthecycle,oryoujumptoanotherspotinthecycle,programmablecontrollersinhcrentlyrememberthestateofthemachine:whatthetimerswere,whatthecounterswere,putersdon'tinherentlydothat.”