Siemens Aktiengesellschaft

Christian Norbert Müller

Dierk Schröder

Ernst-Christoph Krackhardt

Thomas Weichlein

Jan Pellinghoff

Dieter Schlennert

Robin De Ruiter

A communication device with an activated ring controller provided in both first and second subnetworks for data transmission in a redundantly operable communications network, which includes at least one first and one second subnetwork, which each include communication devices interconnected within a ring topology, wherein the subnetworks are interconnected via coupling line sections to which coupling communication devices are connected, where the coupling line section to which a selected coupling communication device is connected is operated as an inactive reserve coupling line section until a disruption occurs, whilst another coupling line section is operated as an active main coupling line section, where coupling communication devices connected to the main coupling line section transmit status datagrams to the selected coupling communication device which additionally include configuration information about whether the particular coupling communication device connected to the main coupling line section is an activatable ring controller.

Method for data transmission in a redundantly operable communications network and coupling communication device

In the case of a variable-pitch propeller or repeller according to the invention, the pitch-adjusting device is arranged in the hub and formed in such a way that it allows only a numerically limited number of different blade pitches, preferably just two blade pitches, for which purpose the pitch-adjusting device comprises an electrical drive device, for moving the blades from a first blade pitch to a second of the numerically limited number of blade pitches, and an electrically actuable locking device, for locking the blades in the numerically limited number of different blade pitches.

Variable-pitch propeller or repeller

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Witzhave, Germany

Christian Norbert Müller