Abstract: A control device that is implemented to control an angular setting of a rotor blade of a wind power plant includes a drive motor including first and second windings that are galvanically isolated from one another, wherein the drive motor can be driven by both or only one of the first and second windings to change an angular setting of the rotor blade relative to the hub on which the rotor blade is mounted. Separate pitch controllers including separate frequency converters and separate emergency power supplies are implemented to provide the windings with drive signals. A wind power plant includes a respective controller for each of a plurality of rotor blades mounted on a hub. The pitch controllers provide a redundant system allowing control of the angular setting of a rotor blade of a wind power plant even when one of the pitch controllers for the drive motor has failed.