文档介绍：该【PLC英文文献+翻译 】是由【文艺人生】上传分享，文档一共【17】页，该文档可以免费在线阅读，需要了解更多关于【PLC英文文献+翻译 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。PLC英文文献+翻译自动化专业本科毕业设计英文翻译学院(部):专业班级:学生姓名:指导教师:,-puter,,highreliability,anti-interferencecapability;Second,programmingvisual,simple;Third,adaptabilitygood;Fourthfunctionalimprovements,:HistoryofPLControllers(PLC),,havebeenwidelyusedinindustryincludingmanufacturingsystems,transportationsystems,chemicalprocessfacilities,,thePLCreplacedthehardwiredlogicwithsoft-wiredlogicorso-calledrelayladderlogic(RLL),aprogramminglanguagevisuallyresemblingthehardwiredlogic,andreducedtherebytheconfigurationtimefrom6monthsdownto6days[MoodyandMorley,1999].eintoplace,PLCbasedcontrolwillremainthetechniquetowhichthemajorityofindustrialapplicationswilladhereduetoitshigherperformance,lowerprice,,accordingtoastudyonthePLCmarketofFrostandSullivan[1995],anincreaseoftheannualsalesvolumeto15millionPLCperyearwiththehardwarevalueofmorethan8billionUSdollarshasbeenpredicted,,RichardEMorley,fairlyconsidersthePLCmarketasa5-,theprogrammingofPLCbasedcontrolsystemsisstillverymuchrelyingontrial-and-,,asinglewoodpeckercoulddestroycivilization.”Particularly,,reducingthescantimeoftheladderlogicisstillanissueinindustrysothatlow-,paredtootherdomains,forinstance,VLSIdesign,-,thereby,,,,impellingtheneedforasystematicdesignmethodology,plexityinlarge--leveldescriptionbasedonstatetransitionmodelsthattreatautomationcontrolsystemsasdiscreteeventsystems,astepwisedesignprocess,,thatis,reducingprogramminganddebuggingtimeandtheirvariation,increasingflexibilityoftheautomationsystems,:nowofPLCFromthestructureisdividedintofixedPLCandModulePLC,thetwokindsofPLCincludingCPUboard,I/Oboard,displaypanel,memoryblock,power,,I/Omodules,memory,thepowermodules,bottomoraframe,,adetailedanalysisoftheCPU'sinternalunnecessary,,byitreadsCPUinstruction,,,umberandsoftwarecapacity,(CPU)-bitmicrocontrollerssuchas8051,andnowtheseare16-and32-’ontrollersbyJapanesemakers,SiemensinEuropeancontrollers,,ontrollers,programexecution,memoryoperation,(todaymostlyimplementedinFLASHtechnology)“1”oras“0”inaspecificmemorybit/,timevalue,(usualway),butalsothroughmanualprogrammers(consoles).’,(ontrollerstoensureexecutiononlyofgoodprograms).ontrollerpossessesvarioususefuloptionssuchas:forcedswitchingonandoffofthesysteminput/outputs(I/Olines),,namesofinputoroutputdevices,mentsthatcanbeusefulwhenfindingerrors,(andnotjustapersonwhodevelopedthesystem),’,.“pure”:PLCdesigncriteriaedeficienciesinthetraditionalwayofprogrammingmanufacturingcontrolsystems,,equivalently,-,,well-odegeneration-ontrollerscanreduceprogramminglead-,,systemsarecharacterizedbyproductandprocessinnovation,ecustomer--time,therefore,,,%[IEC60848,1999;IEC-61131-3,1993;IEC61499,1998;ISO15745-1,1999]havebeenformedtofixanddisseminatestate-of-the-artdesignmethods,,andwillprovidemethodstomakelarge-,itwillimprovesoftwarequalityandreliabilityandwillberelevanttosystemshighsecuritystandards,especiallythosehavinghazardousimpactontheenvir