A rotary milking parlor controlled that uses a set of sensors generating sensor signals that determine whether or not an entity is located at a hazardous position of the rotary milking parlor, and a central control unit, where each sensor in the set of sensors generates first and second independent signals, the first and second signals conveyed separately via respective first and second signal lines to the central control unit, and the rotary milking parlor controlled to be operated only if both the first and second signals of all sensors in the set of sensors indicate that no entity is deemed to be located at a hazardous position.