2016届电子信息工程学院外文文献及译稿外文文献题目:ontroller姓名:梁学文学号:201203024305专业班级:自动化B123院(部):电子信息工程学院指导教师:ontroller,PLC,puterusedforautomationoftypicallyindustrialelectromechanicalprocesses,suchascontrolofmachineryonfactoryassemblylines,amusementrides,,,extendedtemperatureranges,immunitytoelectricalnoise,-backed-upornon-"hard"real-timesystemsinceoutputresultsmustbeproducedinresponsetoinputconditionswithinalimitedtime,,control,sequencing,posedofrelays,camtimers,drumsequencers,anddedicatedclosed-,theprocessforupdatingsuchfacilitiesfortheyearlymodelchange-overwasverytimeconsumingandexpensive,,beinggeneral-purposeprogrammabledevices,,andstringentoperatingenvironmentalcontrolfortemperature,cleanliness,-:itwouldtoleratetheshop-floorenvironment,itwouldsupportdiscrete(bit-form)inputandoutputinaneasilyextensiblemanner,itwouldnotrequireyearsoftrainingtouse,;ordingtothenatureoftheprocess.[1]Sincemanyindustrialprocesseshavetimescaleseasilyaddressedbymillisecondresponsetimes,modern(fast,small,reliable)electronicsgreatlyfacilitatebuildingreliablecontrollers,-Matic(theautomatictransmissiondivisionofGeneralMotors)issuedarequestforproposalsforanelectronicreplacementforhard-wiredrelaysystemsbasedonawhitepaperwrittenbye
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