SIGNAL INPUT DEVICE, SIGNAL OUTPUT DEVICE, SIGNAL INPUT/ OUTPUT SYSTEM AND SIGNAL INPUT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a signal input/output system capable of easily improving reliability of input/output signals. SOLUTION: A prescribed first signal is inputted/outputted and a prescribed second signal is inputted/outputted parallelly to a signal for a processing thereafter. By judging whether or not the prescribed first and second signals are inputted in an order, the reliability of the signal for the processing is confirmed. It is because that, though there is the possibility that either one of the first and second signals is accidentally outputted due to instability at the time of activation on a signal output device side, the possibility that the signals are outputted in the order accidentally is considered to be extremely low.