To automatically stop some devices under mechanical motions to be controlled which are controlled by a distribution controlling system when a CPU is run away.

This apparatus comprises a combination of four constituting units of an operating unit 1, a main unit 2, a radiation controlling unit 3 and a quick photographing unit 4 which are linked like a ring through communicating circuits 22-25 for control to transfer a controlling signal to the controller of each unit. A detection signal for detecting the run away of the CPU is transferred to an electric power supply unit 15 through an emergency signal circuits 26-29, thereby the electric power supply for the objective devices capable of mechanically moving to be controlled in the main unit 2 is stopped.