CIRCUITRY

The disclosure relates to circuitry. The Circuitry comprises control circuitry to control an operating state of a data handling device of a set of two or more redundant data handling devices configured to perform identical data handling functions; the control circuitry is configured to control an operating state of the respective controlled data handling device as a state transition from a currentoperating state of that data handling device to a target operating state in response to the issue of a respective state change signal; the control circuitry comprises a detector responsive to issue of the state change signal in respect of a first threshold number representing some but not all of the data handling devices, to detect whether the state change signal is issued in respect of a furtherone or more of the devices so that a second threshold number of data handling devices is reached. 本公开涉及电路。电路包括控制电路，用于控制被配置为执行相同的数据处理功能的一组两个或更多个冗余数据处理设备中的数据处理设备的操作状态；控制电路被配置为响应于发布相应的状态改变信号，控制相应的受控数据处理设备的操作状态作为从该数据处理设备的当前操作状态到目