PLC Quiz4 保持电路、定时器与计数器测试卷及答案

PLCQuiz4保持电路、定时器与计数器测试卷及答案总分：20分

时长：25分钟您的姓名（中&英）：[填空题]*_________________________________您的小组（只填数字）：[填空题]*_________________________________1.

BasedonFigure1,whatisthefunctionofcontactM0connectedinparallelwithSTART?根据图1，与START并联的M0触点有什么功能？[单选题]*A.ItresetsthetimerautomaticallyB.ItmaintainsRUNafterSTARTisreleased(正确答案)C.ItcountsthenumberofproductsD.ItchangesthePLCmode2.

InFigure1,ifSTARTispressedonceandSTOPremainsnormal,whathappenstoM0afterSTARTisreleased?在图1中，如果START按下一次且STOP保持正常，松开START后M0会怎样？[单选题]*A.M0remainsON(正确答案)B.M0turnsOFFimmediatelyC.M0becomesatimerD.M0resetsthecounter3.

WhatwillmostlikelyhappeniftheSTOPcontactismissingfromtheholdingcircuit?如果保持电路中缺少STOP触点，最可能发生什么？[单选题]*A.ThecounterpresetbecomeszeroB.ThetimerwillruntwiceasfastC.ThePLCchangestoManualModeD.Thecircuitmaynotstopproperly(正确答案)4.

WhichcontactshouldbeusedforaSTOPpushbuttoninabasicholdingcircuit?在基本保持电路中，STOP按钮通常应使用哪种触点？[单选题]*A.NormallyOpencontactB.TimerdonecontactC.NormallyClosedcontact(正确答案)D.Counterdonecontact5.

BasedonFigure2,whichoutputshouldturnONimmediatelywhenthesystementersRUNmode?根据图2，当系统进入RUN模式时，哪个输出应立即开启？[单选题]*A.AlarmlampB.RUNlamp(正确答案)C.WarninglampD.Counterresetlamp6.

ATONtimerhasapresetof5seconds.ItsrungisTRUEforonly3secondsandthenbecomesFALSE.Whathappens?一个TON定时器预设为5秒。其梯级只保持TRUE3秒后变为FALSE。会发生什么？[单选题]*A.TimerdonebitturnsONB.CounterincreasesbyoneC.OutputremainsONpermanentlyD.Accumulatedvalueresets(正确答案)7.

InFigure2,whenshouldtheyellowwarninglampturnON?在图2中，黄色警示灯应在什么时候开启？[单选题]*A.ImmediatelyafterSTOPispressedB.Afterthecounterreaches10C.AftertheRUNconditionisTRUEfor5seconds(正确答案)D.OnlyduringManualMode8.

WhichtimerbehaviourbestdescribesanormalON-delaytimer?以下哪项最能描述普通接通延时定时器的行为？[单选题]*A.ItdelaysoutputactivationaftertherungbecomesTRUE(正确答案)B.ItcountsobjectspassingasensorC.ItstoresproductquantitypermanentlyD.ItonlyworkswhenPLCisOFF9.

BasedonFigure3,whatshouldhappenwhenC0reachesthepresetvalueof10?根据图3，当C0达到预设值10时，应发生什么？[单选题]*A.ConveyorcontinuesrunningB.CounterchangestotimerC.BoxFullconditionactivatesandconveyorstops(正确答案)D.STARTbuttonturnsOFF10.

Whatisthepurposeofthecounterpresetvalueinapackingsystem?在包装系统中，计数器预设值的作用是什么？[单选题]*A.TodeterminethePLCvoltageB.TodelaySTARTbuttonresponseC.ToselectOmronorSiemensmodeD.Todeterminethetargetnumberofpartsbeforecompletion(正确答案)11.

InthePartsPackingCounterSystem,whichsignalshouldnormallyincreasethecounter?在零件包装计数系统中，哪个信号通常应使计数器增加？[单选题]*A.STOPbuttonB.Validpartsensorpulse(正确答案)C.BoxFulllampD.Timerresetbit12.

Whyshouldtheconveyorstopwhenthecounterdonebitbecomesactive?为什么计数器完成位有效时输送带应停止？[单选题]*A.Theboxhasreachedtherequiredquantity(正确答案)B.ThetimerisnotinstalledC.TheSTARTbuttonisfaultyD.Thesensorbecomesanalog13.

BasedonFigure4,whatisthemostsuitablecorrectionforrepeatedcountingofoneobject?根据图4，针对一个物体被重复计数，最合适的修正方法是什么？[单选题]*A.IncreasetheoutputvoltageB.RemovethecounterpresetC.UsearedlampinsteadofasensorD.Userising-edgeorone-shotlogic(正确答案)14.

Acounterreachesthepresetvalue,buttheBoxFulllampdoesnotturnON.Whatshouldbecheckedfirst?计数器达到预设值，但满盒指示灯没有亮。应首先检查什么？[单选题]*A.WhetherthePLClogoisvisibleB.Whetherthetimerpresetis10secondsC.Whetherthecounterdonecontactisusedinthelamprung(正确答案)D.WhetherManualModeistranslated15.

AtimerdonebitneverturnsON.Whichisthemostlikelyreason?定时器完成位一直不ON，最可能的原因是什么？[单选题]*A.TheoutputlampisgreenB.TherungconditiondoesnotstayTRUElongenough(正确答案)C.ThecounterpresetistoolowD.Thebrowserisinlandscapemode16.

WhichstatementcorrectlydifferentiatesSTOPandRESET?以下哪项正确区分STOP与RESET？[单选题]*A.STOPandRESETarealwaysthesameB.RESETisonlyanoutputdeviceC.STOPincreasescountervalueD.STOPusuallystopsoperation,RESETclearsmemory/timer/countervalues(正确答案)17.

InaBatchMixingTank,amixershouldstartonlyafterthehigh-levelsensorisactive.Whichlogicismostsuitable?在批量混合罐中，搅拌器只应在高液位传感器有效后启动。哪种逻辑最合适？[单选题]*A.STOPbuttoncontrolsmixeronlyB.CounterresetcontrolsfillpumponlyC.High-levelsensorcontactcontrolsmixerstage(正确答案)D.Lightsensorcontrolstimerpreset18.

Inatrafficlighttimersequence,whyshouldtwogreenlightsinconflictingdirectionsneverbeONtogether?在交通灯定时顺序中，为什么冲突方向的两个绿灯不能同时亮？[单选题]*A.ItresetsthetimerautomaticallyB.ItincreasesPLCscanspeedC.ItchangesallinputstoanalogD.Itcausesunsafeconflictingtrafficflow(正确答案)19.

Whichsimulatorevidenceisthebestproofthattimer/counterlogicwastestedcorrectly?哪种模拟器证据最能证明定时器/计数器逻辑已正确测试？[单选题]*A.OnlythecoverpagescreenshotB.AblankI/OtableC.Screenshotsshowingrunglogicandprocessoutputstatesduringt