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1、西安科技大学毕业设计（论文）外文翻译题目 PLC系统的功能院、系(部) 机械工程学院专业及班级 机械设计制造及其自动化姓名 指导教师 7.5PLCSystemFunctionssystemhasadvancedtobecomeanopenPLCsystemthatcanmeetthefollowingrequirements:1.Portability:ThePLCprogramcanbeoperatedandisreusableregardlessofPLCsystemandmaker.2.Conne
2、ctivity:Communication(datatransmission)betweenPLCsystemswhosemakersaredifferentshouldbeguaranteed.3.Standardization:Theuserinterfaceandprogramminglanguageareunifiedregardlessofsystemandmaker.Forexample,thePLCsystemsandprogramminglanguagesmentionedinpreviou
3、ssectionsarenotcompatiblewithothersystemsandlanguagesthatothermakersprovide.Therefore,usersshouldlearnthemaker’sownprogramminglanguages.ItisalsoverydifficultforthirdpartiestounderstandandmodifyPLCprograms.Inaddition,whenanewfunctionisadded,itisalmostimposs
4、ibletoguaranteesuccessfulexecutionwithinaspecifiedtime.Toovercometheseproblems,theactivityforstandardizingprogrammingenvironmentsforindustrialautomationequipmentwasstartedandtheIEC,(InternationalElectromechanicalCommission),establishedIEC1131-3in1993.Thest
5、andardIEC1131,istheinternationalstandardforPLC,consistingoffivepartsandIEC1131-3isoneofthepartsofwhichIEC1131iscomposed.1.IEC1131-1:PLCGeneralinformation.2.IEC1131-2:Equipmentandtestrequirements3.IEC1131-3:PLCprogramminglanguage4.IEC1131-4:Userguidelines5.
6、IEC1131-5:CommunicationsIEC1131-3istheinternationalstandardforprogrammablecontrollerprogramminglanguages.Itspecifiesthesyntax,semanticsanddisplayforthefollowingsuiteofPLCprogramminglanguages:1)Ladderdiagram(LD),2)SequentialFunctionCharts(SFC),3)FunctionBlo
7、ckDiagram(FBD),4)StructuredText(ST),and5)InstructionList(IL).IfweuseIEC1131-3toeditaPLCprogram,itispossibletoobtainthefollowingadvantages:1.Becausesyntaxandsemanticsareunified,itispossibletogenerateaprogramthatcanbeoperatedonallmakers’systemsandtheprogramc
8、anbeexecutedregardlessofmaker.2.Itiseasytomaintaintheprogram.3.Becausethestandardsupportsthestructuredprogrammingmethod,anycomplexprogramcanbeeditedineasilyunderstandableandstructuredformatandcaneasilybemaint
