INTERRUPTION DETECTION CIRCUIT

摘要

PURPOSE:To execute interruption detection without outputting mis-alarm by delaying inputted frame pulse of plural systems for a prescribed time larger than a time when alarm restoration is delayed and outputting the result. CONSTITUTION:When inputted frame pulses of plural systems are delayed by a time longer than the delay time by a prescribed time at a delay means 600, e.g. the restoration delay time at restoration of an alarm signal at a 1st interruption detection means 300, and outputted. The output is fed to an in-circuit alarm output section 900via a 2nd interruption detection section 500. Then mis-alarm at restoration due to a delay in the 1st interrupt detection section 300 is covered by an output of the 2nd interruption detection section 500 and no mis-alarm is outputted from the in-circuit alarm output section 900.