18 • Das WAGO-I/O-SYSTEM 750
Versorgung
2.6 Versorgung
2.6.1Potentialtrennung
Innerhalb des Feldbusknotens bestehen drei galvanisch getrennten Potentialgruppen.
•Betriebsspannung für das Feldbus-Interface.
•Elektronik des Kopplers / Controllers und der Busklemmen (K-Bus).
•Alle Busklemmen besitzen eine galvanische Trennung zwischen der Elektronik (K-Bus, Logik) und der feldseitigen Elektronik. Bei einigen AnalogEingangsklemmen ist diese Trennung kanalweise aufgebaut, siehe Katalog.
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Abb. 2-9: Potentialtrennung |
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g0xxx01d |
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Beachten
Der Schutzleiteranschluss muss in jeder Gruppe vorhanden sein. Damit unter allen Umständen die Schutzleiterfunktion erhalten bleibt, kann es sinnvoll sein den Anschluss am Anfang und Ende einer Potentialgruppe aufzulegen (Ringspeisung, siehe Kapitel 2.7.3). Sollte bei Wartungsarbeiten eine Busklemme aus dem Verbund gelöst werden, ist dadurch der Schutzleiteranschluss für alle angeschlossenen Feldgeräte gewährleistet.
Bei der Verwendung eines gemeinsamen Netzteils für die 24 V-System- versorgung und die 24 V-Feldversorgung wird die galvanische Trennung zwischen K-Bus und Feldebene für die Potentialgruppe aufgehoben.
WAGO-I/O-SYSTEM 750
DeviceNet