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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Sonderfunktionen
LOGO!Soft Comfort Online-Hilfe
300 Betriebsanleitung, 11/2017
Timing-Diagramm A: Funktion mit negativem Differenzwert Delta
Timing-Diagramm B: Funktion mit positivem Differenzwert Delta
Funktionsbeschreibung
Die Funktion liest den Analogwert des Signals ein, das an dem Analogeingang Ax anliegt.
Ax wird mit dem Parameter A (Gain) multipliziert. Der Parameter B (Offset) wird danach zum
Analogwert addiert, also
(Ax * Gain) + Offset = Aktualwert Ax.
Der Ausgang Q wird in Abhängigkeit von dem eingestellten Schwellwert (On) und dem
Differenzwert (Delta) gesetzt oder zurückgesetzt. Die Funktion berechnet den Parameter Off
automatisch: Off = On + Delta, wobei Delta positiv oder negativ sein kann. Siehe folgende
Rechenvorschrift.
Rechenvorschrift
● Wenn Sie einen negativen Differenzwert Delta parametrieren, ist die Einschaltschwelle
(On) ≥ Ausschaltschwelle (Off), und es gilt:
Q = 1, falls Aktualwert Ax > On
Q = 0, falls Aktualwert Ax ≤ Off.
Siehe Timing-Diagramm A.
● Wenn Sie einen positiven Differenzwert Delta parametrieren, ist die Einschaltschwelle
(On) < Ausschaltschwelle (Off), und es ist Q = 1, falls:
On ≤ Aktualwert Ax < Off.
Siehe Timing-Diagramm B.
Besonderheiten beim Parametrieren
Beachten Sie die Informationen zu Analogwertverarbeitung (Seite 325), in denen Sie
Hilfestellungen zu den Blockparametern der Analogblöcke erhalten.
Sonderfunktionen (Seite 249)
… 300 …


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