//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/ 0750656794-CH023.3D – 254 – [247–264/18]
19.6.2004 9:18PM
Note
1.High-speedcounterreset
Itisessentialthatallhigh-speedcountersareinitiallyreset,beforebeingused.
2.Switchbounce
IfaswitchisusedtoinputpulsesintoX0,thenconnecta0.1 mFcapacitorfromthe
X0inputterminalto0V.Thisensuresswitchbouncepulsesarenotcounted.
Principleofoperation
1.Line0
(a)OperatingInputX6willenergisetheup/downMemoryCoilM8235.
(b)IfM8235isOFF,thenthecounterwillcountUP.IfM8235isON,thenthe
counterwillcountDOWN.
2.Line3
(a)TheoperationofX7willresetthehigh-speedCounterC235.
(b)OnswitchingtoRUN,M8002willoperateforonescantime,andthiswillalso
resetthecounter.
3.Line7
(a)OnswitchingtoRUN,M8000willoperateandthiswillenergisethecoilofthe
high-spee ...