外文翻译--开发与PLC功能和网络等效的虚拟仪器.doc外文翻译--开发与PLC功能和网络等效的虚拟仪器.doc

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英文原文JOURNALOFSOFTWAREENGINEERINGANDAPPLICATIONS,2011,4,172180DOI104236/JSEA201143019PUBLISHEDONLINEMARCH2011HTTP//WWWSCIRPORG/JOURNAL/JSEADEVELOPMENTOFEQUIVALENTVIRTUALINSTRUMENTSTOPLCFUNCTIONSANDNETWORKSMOHAMMADAKALIA,TARIQMYOUNES,MOHAMMADABUZALATAMECHATRONCISENGINEERINGDEPARTMENT,FACULTYOFENGINEERINGTECHNOLOGY,ALBALQAAPPLIEDUNIVERSITY,AMMAN,JORDANEMAILMAKALALIA2000YAHOOCOM,TARIQMOGHOTMAILCOM,ABUZALATAYAHOOCOMRECEIVEDFEBRUARY20TH,2011;REVISEDMARCH5TH,2011;ACCEPTEDMARCH10TH,2011ABSTRACTTHISRESEARCHISACONTINUATIONTOOURWORKWHICHWASPUBLISHEDIN1EIGHTDIFFERENTTIMINGVISAREDESIGNEDANDTESTEDTHESEINCLUDEONDELAY,OFFDELAY,SINGLESHOT,RETRIGGERABLEMONOSTABLE,ANDACCUMULATIVESOFTWAREBASEDTIMERSUSINGHARDWAREPROGRAMMABLECOUNTER/TIMERCHIPDAQSTC24BITANDPCIMIO16E1DAQBOARD,ANOTHERTWOPRECISETIMERSAREDESIGNEDATTHEENDOFTHEPAPER,FORILLUSTRATIONPURPOSES,ANELECTROPNEUMATICDRIVESYSTEMWASDEVELOPEDANDCONTROLLEDUTILIZINGDESIGNEDONDELAYTIMERSVIFUNCTIONSRESULTSOFEXPERIMENTSHOWCOMPLETECOINCIDENCEBETWEENTHEPLCBASEDCONTROLANDVIRTUALPLCBASEDPROGRAMRESULTSKEYWORDSPLC,VIRTUALPLC,LABVIEW,PROGRAMMABLETIMERS1INTRODUCTIONINOURWORK“DESIGNOFAVIRTUALPLCUSINGLABVIEW”WEHAVESHOWNHOWITISPOSSIBLETOCREATELABVIEWVISWHICHREPRESENTPLCFUNCTIONSANDNETWORKSWECOMPAREDBETWEENPCBASEDANDPLCBASEDCONTROLSYSTEMS,ANDCAMETOTHEFACTTHATBOTHSYSTEMSARECONTINUOUSLYDEVELOPINGINTHESAMEDIRECTIONINORDERTOOBTAINBETTERPROGRAMMABILITY,CONNECTIVITYANDCOMMUNICATIONINTERFACINGATTHETIMEBEINGTHEPCBASEDDCSSARESUITEDFORINDUSTRIALAPPLICATIONSTHEYAREROBUSTANDTHEYEASILYWORKINANOPENARCHITECTUREMODE,WHILEPLCSAREEQUIPPEDWITHSPECIFICMMISOFTWAREANDPSEUDOSTANDARDCOMMUTATIONSOFTWAREALSOWEHAVESHOWNTHATINORDERTOIMPROVETHEPROGRAMMABILITYOFPACS,WEPRACTICALLYBROUGHTTHEPLCTOTHECOMPUTERUTILIZINGBYTHATNUMEROUSADVANTAGESOFCOMPUTERSSUCHASMULTITASKING,UNLIMITEDMEMORY,HIGHSPEEDANDTHEPOSSIBILITYOFCREATINGUNLIMITEDNUMBEROFPROGRAMMABLEOBJECTSSUCHASCOUNTERS,TIMERS,SHIFTREGISTERSANDOTHERSBECAUSEOFTHELIMITEDSIZEOFPREVIOUSWORK,WEWERENOTABLETOCOVEROTHERIMPORTANTVISWHICHMAYBEUSEDALSOASTHEANALOGOFPLCFUNCTIONSINTHISPAPERWESHALLDEVELOPDIFFERENTTYPESOFPROGRAMMABLETIMERSUSINGLABVIEWSOFTWARE2ANDNIDAQBOARDHARDWAREALSOTHELABVIEWBASICFUNCTIONSTHATPROVIDETIMINGONMILLISECONDLEVELARETHE“WAIT”AND“WAITFORNEXTMSMULTIPLE”VISBOTHAREBASEDONTHESAMEUNDERLYINGMECHANISMMOSTAPPLICATIONSWORKCOMFORTABLYWITHAVAILABLELABVIEWMEASUREMENTSTHATRESOLVEMILLISECONDS,ANDMANYMOREOPERATEWITHSECONDRESOLUTION34AFEWAPPLICATIONSDEMANDSUBMILLISECONDRESOLUTIONANDRESPONSETIME,WHICHISPROBLEMATICDUEPRIMARILYTOOPERATINGSYSTEMANDNOTALABVIEWLIMITATION5IFTHEAPPLICATIONREQUIRESHIGHERACCURACYORRESOLUTIONTHANTHEBUILTINTIMINGFUNCTIONSCANSUPPLY,THENONEWILLHAVETOUSESOMEADDITIONALHARDWARE,SUCHASNIDAQBOARDSORANEXTERNALCLOCK6NIBOARDSHAVETWO24BITCOUNTERCHIPSANDSEVERALONBOARDCLOCKSTHATCANBECOUNTEDTOPRODUCEACCURATETIMINGINTERVALSWITHTHEDAQCOUNTERTIMERVIS,ONECANCONFIGURETHEONBOARDVERSATILEHARDWAREFORAVARIETYOFTASKSINCLUDINGTHEACCURATEGENERATIONOFTIMEDPULSES,COUNTINGEVENTS,ANDTHEMEASUREMENTOFPERIODSANDFREQUENCIESTHECOUNTEROUTPUTGENERATESAPULSEWHENAPREPROGRAMMEDTERMINALCOUNTTCISREACHEDTHEPULSEMAYBEUSEDFORSEQUENCINGPURPOSESSIMILARHARDWAREBASEDTIMINGMAYBEPERFORMEDUSINGWINDOWSAPIFUNCTION“QUERYPERFORMANCECOUNTER”THISFUNCTIONLOOKSATAHIGHRESOLUTIONSYSTEMHARDWARECOUNTERTHATRUNSATAPPROXIMATELY12MHZOR08MICROSECONDCOUNTTHEACTUALRESOLUTION,ONCEWEACCOUNTFORTHEDELAYINCALLINGTHEFUNCTION,WILLBECONSIDERABLYLESS,BUTSTILLFARBETTERTHANONEMILLISECONDCONCERNINGREALTIMEOPERATINGSYSTEMSRTOS,THEYAREDESIGNEDTORUNASINGLEPROGRAMWITHVERYPRECISETIMINGTHEYCANALLOWTORUNLOOPSWITHNEARLYTHESAMETHINGEACHITERATIONTYPICALLYWITHINMICROSECONDSTIMINGFORHARDRTOSSCANBEPERFORMEDUSINGTHEDAQCARD’SINTERNALCLOCK,GIVINGBETTERACCURACYTHANSOFTWARETIMINGFUNCTIONS7ATTHETIMEBEING,SOMEHARDWAREPLATFORMSFEATUREANONBOARDFPGA,THATMAYBEPROGRAMMEDUSINGLABVIEWFPGAMODULENICOMACTRIOANDSINGLEBOARDRIOAREEXAMPLESTHEDEFAULTCLOCKRATEOFLABVIEWFPGAIS40MHZGENERALFPGATIMINGVIS2MAYGENERATEONECLOCKPERIODONESHOTPULSEORMEASURETHEPERIOD,PULSEWIDTH,ACCUMULATEPERIODOVERASPECIFIEDNUMBEROFPULSESANDCOUNTPULSESOVERASPECIFIEDPERIODOFTIMENEVERTHELESSFPGAVISDONOTINCLUDEREADYONDELAYTIMERS,OFFDELAYTIMERSANDMOMOSTABLERETRIGGERABLETIMERSWHICHFINDEXTENSIVEAPPLICATIONSINPLCSEQUENTIALCONTROLPROGRAMSBUILDINGONTHEABOVE,THETARGETOFTHISWORKISTOILLUSTRATETHEDESIGNOFDIFFERENTTYPESOFTIMINGVISUSINGLABVIEWSOFTWAREINORDERTOBEUSEDASPROGRAMMINGELEMENTSINVIRTUALPLCPROGRAMS2ONDELAYTIMER1ONDELAYTIMER1FIGURE1SHOWSTHEFRONTPANELANDTHEBLOCKDIAGRAMCOMPONENTSOFASOFTWAREBASEDONDELAYTIMERTHELOOPITERATIONISINDICATEDINSECONDSBECAUSETHELOOPITERATIONSTARTSFROMZERO,THEINCREMENTFUNCTIONISADDEDINORDERTOSTARTITATONESINCETHEWAITICONHAS100MSDELAYBETWEENEVERYTWOITERATIONSAFACTOROF10ISMULTIPLIEDBYTIMERPREASSIGNEDVALUE,INORDERTOMEASURETHETIMEDELAYINSECONDSAFTERTHEAPPLICATIONOFENABLESIGNALITTAKESSOMEDELAYTIMEINTERVALFORTHEEQUALFUNCTIONTOHAVEATRUESTATEATTHEOUTPUTIFTHEINPUTSIGNALISDISABLED,THETIMEROUTPUTINSTANTLYCHANGESTOLOWSTATE2ONDELAYTIMER2THECOMPONENTSOFTHEVIARESHOWNINTHEBLOCKDIAGRAM,FIGURE2INITIALLYTHEINPUTSIGNALISNOTENABLEDANDTHEFALSECASEISACTIVATEDTHEOUTPUTOFSELECTICONWILLBEZERO,WHICHISLOWERTHANTHETIMERPRESETVALUE,ANDASARESULTOFTHATTHEOUTPUTOFTHETIMERISOFFWHENTHEINPUTSIGNALISENABLEDTHETRUECASEISEXECUTEDANDTHESELECTICONWILLOUTPUTTHEVALUETHATCOMESFORMTHEOUTPUTOFTHECASESTRUCTURETHEINITIALVALUEOFTHEITERATIONLOCALVARIABLEISZERO,THENITWILLBEINCREMENTEDAFTERADELAYCAUSEDBYTHEWAITICON,ANDTHENCOMPAREDBYTIMERPRESETVALUEWHENTHEOUTPUTOFTHECOMPARISONFUNCTIONISTRUE,THEOUTPUTOFTHETIMERBECOMESHIGHWHENTHEENABLEINPUTSIGNALBECOMESLOW,THEOUTPUTOFTHETIMERBECOMESLOWSIMULTANEOUSLYINTHISVI,THECHECKINGOFTHECASESTRUCTUREISCONTINUOUSATASCANRATEEQUALTOONEMILLISECOND,WHICHISACCEPTEDFORMANYAPPLICATIONS(A)(B)CFIGURE1ONDELAYTIMER1,ATHEBLOCKDIAGRAM;BTHEFRONTPANEL;CSUBICON3OFFDELAYTIME1OFFDELAYTIMER1THEFRONTPANELANDBLOCKDIAGRAMARESHOWNINFIGURE3THEWHILELOOPANDOTHERVICOMPONENTSARELOCATEDINSIDETHEFALSECASEOFTHECASESTRUCTURETHETRUECASEHASALOCALVARIABLEOFTHETIMEROUTPUT,WHICHISWIREDTOTHESELECTORTERMINALTHEENABLEINPUTSIGNALISCONNECTEDTOTHESELECTORTERMINALOFTHEFALSECASE2OFFDELAYTIMER2THEBLOCKDIAGRAMISGIVENINFIGURE4WHENTHEINPUTISENABLEDTHETRUECASEISACTIVATEDANDTHESELECTICONWILLBESELECTEDTOZEROINTHISCASETHEOUTPUTOFTHECOMPARISONFUNCTIONISFALSEANDTHETIMEROUTPUTISTRUEWHENTHEINPUTSIGNALISDISABLEDTHEFALSECASEEXECUTES,ANDTHESELECTICONISSELECTEDTOTHEVALUETHATCOMESFROMTHEOUTPUTOFTHECASESTRUCTUREWHENTHEOFFDELAYTIMEINTERVALELAPSESTHEOUTPUTOFTHECOMPARISONFUNCTIONISTRUEANDTHETIMEROUTPUTISFALSEA
编号:201311171617307191    类型:共享资源    大小:3.83MB    格式:DOC    上传时间:2013-11-17
  
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