外文翻译--应用于电气系统的可编程序控制器 英文版.pdf

Archive of Applied Mechanics 74(2005) 489-508@Springer-Verlag 2005 DOI10.1007/s00419-004-0363-4 designedfor systems Programmable controller Cheded,L Al-Mulla,Maan UniversityofAustralia Technical Thisprojectdealswiththestudyofelectro-pneumaticsystemsand theprogrammablecontrollerthatprovidesaneffectiveandeasywayto controlthesequenceofthepneumaticactuatorsmovementandthestates ofpneumaticsystem.Theprojectofaspecificcontrollerforpneumatic applicationsjointhestudyofautomationdesignandthecontrol processingofpneumaticsystemswiththeelectronicdesignbasedon microcontrollerstoimplementtheresourcesofthecontroller. 1. Introduction Theautomationsystemsthatuseelectro-pneumatictechnologyare formedmainlybythreekindsofelements:actuatorsormotors,sensors orbuttonsandcontrolelementslikevalves.Nowadays,mostofthe controlelementsusedtoexecutethelogicofthesystemwere substitutedbytheProgrammableLogicController(PLC). Sensorsand switchesarepluggedasinputsandthedirectcontrolvalvesforthe actuatorsarepluggedasoutputs.Aninternalprogramexecutesallthe logicnecessarytothesequenceofthe movements,simulatesother componentslikecounter,timerandcontrolthestatusofthesystem. WiththeuseofthePLC, theprojectwinsagility,becauseitis possibletocreateandsimulatethesystemasmanytimesasneeded. Therefore,timecanbesaved,riskofmistakesreducedandcomplexity canbeincreasedusingthesameelements. A conventionalPLC, thatispossibletofindonthemarketfrommany companies,offersmanyresourcestocontrolnotonlypneumaticsystems, butallkindsofsystemthatuseselectricalcomponents.ThePLC canbe veryversatileandrobusttobeappliedinmanykindsofapplicationin theindustryorevensecuritysystemandautomationofbuildings. Becauseofthosecharacteristics,insomeapplicationsthePLC offerstomuchresourcesthatarenotevenusedtocontrolthesystem, electro-pneumaticsystemisoneofth