高速计数器模组VB-1HC说明书(4)

适用于plc的工程应用人员

2)BFM#3,#2Ringlength

Storesthedatathatspecifiesthelengthofthe16-bitcounter(default:K65,536).

UPIntheaboveexample,K100iswrittenintoBFMs#3and#2ofspecialblockNo.2asa32-bitbinaryvalue(BFM#3=0,BFM#2=100).Permittedvalues:K2toK65,536.WhenringlengthK100isspecified,thevalueofthecounterchangesasshownabove.

Note:Writecounterdatawith(D)TO!Countdataisalwayshandledasapairfromtwo16-bitvaluesinthisspecialfunctionblock.16-bit2's

complementvaluestoredintheregistersofthePLCcannotbeused.!WhenyouarewritingapositivevaluebetweenK32,768andK65,535,thedatashouldbetreatedasa32-bit

valueevenwhena16-bitringcounterisused.!Whentransferringcounterdatato/fromthisspecialfunctionblock,alwaysusethe32-bitformsofthe

FROM/TOinstructions((D)FROM,(D)TO).

1.Whenb0issettoONandtheDISABLEinput

terminaltoOFF,thecounterispermittedtostartcountinginputpulses.

2.YH1canturntoON,onlyifb1issettoON.3.YH2canturntoON,onlyifb2issettoON.

4.B3=ON,YH2outputisresetifYH1outputisset,and

YH1outputisresetifYH2outputisset.

B3=OFF,YH1andYH2outputactindependently,

anddonotreseteachother.

5.Whenb4=OFF,presetfunctionbythePRESETinputterminalisdisabled.

6.Whenb8issettoON,allerrorflagsarereset.7.Whenb9issettoON,YH1outputisreset.8.Whenb10issettoON,YH2outputisreset.9.Whenb11issettoON,YH1outputissetON.10.Whenb12issettoON,YH2outputissetON.

4)BFM#11,#10Presetdata

Presetdataisusedtopresetthecurrentvalueofthecounterandwillbecomevalidwhenb4ofBFM#4issettoONandPRESETinputterminalchangesfromOFFtoON.(risingedge)5)BFM#13,#12ComparisonvalueforYH1output,BFM#15,#14ComparisonvalueforYH2output

AftercomparingthecurrentvalueofthecounterwiththevaluewritteninBFM#13and#12,BFM#15and#14,thecomparatorintheVB-1HCoutputsthecomparisonresult.YH1,YH2outputwillnotturnONifyouusePRESETortheTOinstructiontosetthecountervalueequaltothecomparison

value.ItwillturnONonlywhenamatchoccursbythecountingofinputpulses.

Outputoccurswhenthecurrentvaluebecomesequaltothecomparevaluebutonlyifb1andb2ofBFM#4areON.Onceanoutputisset,it

remainsONuntilitisresetbyb9orb10ofBFM#4.Ifb3ofBFM#4isON,however,oneoftheoutputsisresetwhentheotherisset.C

lue

ur6)Countercurrentvalue(BFM#21,20)

Thedefaultvalueofthecounteriszero.

Theinitialcountervaluecanbesetbywritinga32bitvaluedirectlyintoBFM#21and#20(currentvalueofthecounter).

ThecurrentvalueofthecountercanbereadbythePLC.Itwillnotbethecorrectvalueduringhigh-speedoperationsbecauseofthecommunicationdelay.

7)Maximumcountvalue(BFM#23,22),Minimumcountvalue(BFM#25,24)

TheseBFMsstorethemaximumandminimumvalueEVERreachedbythecounter.Ifthepoweristurnedoff,thestoreddataiscleared.BFM#26isforreadingonly.Writecommandsfromtheprogrammablecontrollerareignored,doingsowillcauseM9067ToON.

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