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LOGO!-Handboek
A5E00129033-01
Wenk
Voer altijd een tijd T w 0.10 s in. Voor T = 0.05 s en T =
0.00 s is de periode T niet gedefinieerd.
Nauwkeurigheid van T
Alle elektronische onderdelen vertonen minieme verschil-
len. Daardoor kunnen er afwijkingen van de ingestelde tijd
T optreden. Bij LOGO! bedraagt de afwijking maximaal
" 0,02 %.
Is 0,02 % van de tijd T kleiner dan 0,1 seconde, dan be-
draagt de afwijking maximaal 0,1 seconde.
Voorbeeld:
Bij 1 uur (3600 seconden) bedraagt de afwijking maximaal
" 0,02 %, d.w.z. " 0,72 seconde.
Bij 1 minuut (60 seconden) bedraagt de afwijking maximaal
" 0,1 seconde.
Nauwkeurigheid van de schakelklok
Om een onnauwkeurige werking van de klok bij de C-va-
rianten ten gevolge van deze afwijking te voorkomen, wordt
de schakelklok regelmatig vergeleken met een uiterst
nauwkeurige tijdbasis en bijgeregeld. Er ontstaat een loo-
pafwijking loopafwijking van maximaal $5 seconden per
dag.
4.3.3 Bufferen van de klok
Bij LOGO! loopt de interne klok ook verder als de netspan-
ning uitvalt, met andere woorden de klok beschikt over een
loopreserve. De duur van de loopreserve wordt door de
omgevingstemperatuur beïnvloed. Bij 25°C omgevingstem-
peratuur bedraagt de loopreserve standaard 80 uren.
LOGO! functies
111


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