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1、西门子300PLC从入门到精通的100个经典问题及解答1:howtoavoid"communicationfailure"messageswhenusingCPU315FandET200S?UsingtheCPUS7315F,ET200S,andthefail-safeDI/DOmodule,youwillcallthe0B35faultsecurityprogram・Also,youhavereceivedthedefaultsettingvaluesforallmonitoringtimesandarewillingtoreceive^communicationfailu
2、re，/messages・OB35defaultsto100milliseconds・You，vesettheF1/0module'sFmonitoringtimeto100milliseconds,soatleastevery100millisecondsyouhavetoaddressan1/0module・Butbecausethe0B35iscalledevery100milliseconds,thereisacommunicationbreakdown.Toensurethatthe0B35scanintervalisdifferentfromtheFmonitor
3、ingtime,makesurethattheFmonitoringtimeisgreaterthantheob-35seaninterva1.TheS7distributedsecuritysystem,allthewayuptoV5・2SP1and6ES7138-4fa00-0ab0,6es7138-4fb00-0ab0,6es7138-4cf00-0ab0.Inthenewmodule,theFmonitortimeissetto150milliseconds・2:whatisthemonitoringtimeforthes7~300CPUonPROFIBUSwhent
4、heDPisnotavailable?WhentheDPontheCPU'sPROFIBUSinterfaceoperatesonthePROFIBUSnetworkfromthestation,itishopedthattheexpectedconfigurationandtheactualconfigurationwillbematchedduringstartup.TheStartupTABintheCPUpropertiesdialoggivestwodifferenttimes・3:howtodeterminepowerorbuffererror,suchasbat
5、teryfailure?Ifanerrorinthepowersource(s7~400)orbuffertriggersanevent,theCPUoperatingsystemaccessesthe0B81・Aftererrorcorrection,revisit0B81・Incaseofbatteryfailure,ifthebatt・indieswitchisactivatedinthebatterytest,thes7-400onlyaccesses0B81.Ifthereisnoconfiguration0B81,theCPUwillnotgointooperat
6、ionSTOP・Ifthe0B81isnotavailable,theCPUisstillrunningwhenthepowersourcefails・4:whatshouldbepaidattentiontowhenassigninganI/Omodule(centralizedordistributed)tothes7cpus?Pleasenotethatcreatedthedataarea(e.g.,adoubleword)cannotbeconfiguredattheboundariesoftheprocessimage,becauseintheblock,onlyb
7、elowtheborderareatobereadintheimageprocess,thereforecouldnothaveaccesstothedatafromprocessimage・Therefore,theseconfigurationrulesdonotsupportthissituation:forexample,atwo-wordtypeisenteredinthe254addressoftheprocessimageofa256byteinput・Ifthisisnecessary,
