Abstract: A method for an operation-safe replacement of a control head is provided. The control head is configured to actuate a movement of a target and defines at least a first operating position according to which the target is arranged prior to exchanging the control head for a replacement control head. After exchange, the replacement control head receives configuration data and parameters of the exchanged control head. The replacement control head defines at least a second operating position. The second operating position of the replacement control head generally corresponds to the first operating position defined by the exchanged control head. A position sensing system is provided to sense a position of the target after the exchange procedure. An indicator unit is used to provide a state indicator, wherein the state indicator at least depends on a difference between the position of the target and the second operating position defined by the replacement control head.