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1、现场总线profibus技术问答(FieldbusProfibusTechnologyQ&A)CAMETAninthvolume97PROFIBUSfieldbustechnologyquestionansweringtechnologyontheauthor:Mt.DennisvanBoomaisgeneralmanagerofHollandPROCENTECCorporationManagcr,engagedinPROFIBUStechnologyfor14years・Inadditiontoparticipat
2、ingintheworld'smorethan100Largeandmedium-sizedPROFIBUSprojects,andisresponsiblefortroubleshooting,oftenparticipateWithseminars,lecturesandtraining,andwrotealargenumberofPROFIBUSArticle,theactualworkexperiencegainedbysharingwithyou.Willbe2006Someoftheaudience'ss
3、killsduringthePROFIBUSseminarinBeijingandianinMayQucstionsanswered・Question1:whatisthepriceratiobetweentraditionalcablingandPROFIBUScabling?Itiswe11knownthatthewiringcostofPROFIBUSismorethanthecostoftraditionalwiringMoreeconomically,infact,notonlythat,butother
4、costsassociatedwithitarealsoreducedQuiteafew.Suchas:reducingthecableholder,savingenergy,simplifyingthedocument,Theinterfaceofclarity,reducesthetesttimeandparts,moreeasytoexpandWithchanges,duetomaintenanceintime,greatlyreducingthedowntime,whichisonlythebaseknotS
5、avestructureandinitialcosts;andtherealmeaningofthecostsavingstostartanewMaintenanceandoperationcost・PROFIBUSisagreatchoice,butitneedstogothroughSometrainingisneededtounderstanditsadvantages・Problem2:PROFIBUShowmanyrepeaterscanbeconnectedcontinuously?Somedocumen
6、tsmentionthatyoucanconnectupto3repeaters,eveninthepresenceofThefigureisalsomentionedinthestandard,butthisisnotentirelycorrect,TheelectroniccomponentsoftherelaydeterminethemaximumnumberofconnectionstheycanconnectAsaresultofregeneration,thedigitswillbecomelargero
7、rsmaller・IfyoustringtogetherTherearemanyrepeaters,andthemessagespassedwillnolongerbeidentifiedThedifferenceistoolargefordigits・TherearealsounlimitednumbersofrepeatersonthemarketSo,firstyouneedtocheckthemanual,anditwillbethereExplainthemaximumnumber,forexample,S
8、IEMENS'srepeateris9,ThePROCENTECofHollandProfiHubisinfinite;thesecondstepisTochangebusparameters,allrepeatershavetimedelays,falseIfyouconnectalotofrelaysinseries,youhavetoDP
