| 摘要 |
PROBLEM TO BE SOLVED: To unnecessitate the time and effort of confirming a signal form by discriminating a no-voltage contact signal inputted by the time the integrating circuit of an alarm device becomes a stationary state as a no-abnormality signal, detecting the displacement of the no-voltage contact signal by subsequent abnormality occurrence and signaling an alarm. SOLUTION: The power of an alarm device is supplied, and the period L of a prescribed time chart is inputted by the transient phenomenon of an integrating circuit where the CLR input of a D-flip flop is composed of a resistance R2 and a capacitor C2. As a result, a Q output of the D-flip flop is made L, and a LED and a buzzer BZ are turned off to make a state in which abnormality does not exist. When an alarm is issued, a signal input terminal is made a closed circuit, the period H of the prescribed time chart is inputted by the transient phenomenon of an integrating circuit where an input 2 of an EX-OR is composed of a resistance R1 and a capacitor C1, its output 3 is made H, the H is inputted to the D-flip flop, and the LED and the buzzer BZ are turned on to signal an alarm. |
