FAILSAFE OUTPUT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a failsafe output device which has the failsafe properties for the control signals of each system of a triple system without using any complicated circuit constitution. SOLUTION: A control signal input circuit 5 successively inputs the control signals received from each system of a triple system with each prescribed delay time. A majority output circuit 6 outputs a control command signal to a control device 2 when the coincidence is confirmed between the control signals of two systems among those of three systems. A signal detection circuit 8 detects the presence or absence of the control command signal. Then a failure detection circuit 11 detects the failure of the circuit 6 based on the input states of the detection signal of the circuit 8 and the control signal inputted to the circuit 5.