SIGNAL ERROR DETECTOR FOR ENCODER

摘要

PROBLEM TO BE SOLVED: To enhance noise resistance by preventing erroneous operation due to noise and to prevent erroneous operation by detecting failure of an encoder. SOLUTION: The signal error detector for encoder comprises means 3 for receiving first and pulses and detecting the state transition thereof. The state transition detecting means 3 outputs a state transition other than a predetermined order as an invalid transition and outputs an error upon occurrence of a state transition following to output of an invalid transition.