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电气自动化专业英语(第3版)全套PPT课件.ppt

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ExerciseUnit7EXERCISE1ChoosethebestaccessoriesofProgrammableLogicController(PLC)accordingtotheinformationgiven.1.C2.E3.A4.D5.BUnit7ExerciseEXERCISE2TranslatethefollowingphrasesintoChineseorEnglish.1.assemblyline______________2.____________可编程序逻辑控制器3.CNCmachine_______________4.____________电源5.relaycontact_______________6.____________多端输入7.photosensor_______________8.____________交流功率装配线PLC数控机床继电器触点光传感器nominalvoltagemultipleinputsACpowerUnit7ReadingBProgrammableLogicController(II)ProgrammingaPLC(STEP7-Micro/WIN32STEP)7-Micro/WINisthesoftwareusedwiththeS7-200PLCtocreateauserprogram.TheprogramsconsistofanumberofinstructionsthatmustbearrangedinalogicalordertoobtainthedesiredPLCoperation.STEP7-MicroWINprogrammingsoftwarecanberunofflineoronline.Off-lineprogrammingallowstheusertoedittheprogramandperformanumberofmaintenancetasks.OnlineprogrammingrequiresthePLCtobeconnectedtotheprogrammingdevice.BasicLadderLogicSymbolsPLCladderlogicconsistsofacommonlyusedsetofsymbolsthatrepresentinstructions.UnderstandingthesebasicsymbolsisessentialtounderstandingPLCoperation.Unit7ContactsTwoofthemostcommonprogrammingfunctionsarethenormallyopen(NO)contactandthenormallyclosed(NC)contact.Symbolically,powerflowsthroughthesecontactswhentheyareclosed.Thenormallyopencontactisclosedwhentheinputoroutputstatusbitcontrollingthecontactis1.Thenormallyclosedcontactisclosedwhentheinputoroutputstatusbitcontrollingthecontactis0(Figure7-4).CoilsCoilsrepresentrelaysthatareenergizedwhenpowerflowstothem.Whenacoilisenergized,itcausesacorrespondingoutputtoturnonbychangingthestateofthestatusbitco

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