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LOGO!-Handboek
A5E00129033-01
248
3. Start daarna het programma en schakel LOGO! in de
parametreermodus. In de parametreermodus kunt u de
parameters van de drempelwaardeschakelaar bekijken.
B01:Par
SW =1000+
SW =0000
fa =0086
#
"
fa= is de som van de
gemeten impulsen per
tijdseenheid G_T
4. De reciproke waarde van fa is gelijk aan de cyclusduur
van LOGO! met het programma dat actueel in het ge-
heugen is opgenomen.
1/fa = cyclusduur in s
Toelichting
Bij elke programmarun wisselt de klokpulsgever (T=0) zijn
uitgangssignaal. Een niveau (high of low) duurt exact even
lang als een cyclus. Een periode duurt dan 2 cycli.
De drempelwaardeschakelaar geeft de verhouding weer
van perioden per 2 seconden, waaruit dan de verhouding
van cycli per seconde resulteert.
Flankwisseling van de klokpulsgever
bij elke programmarun
Cyclus-
duur
Periode
1 periode = 1 impuls = 2 cycli
Cyclustijd bepalen
258


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