| 摘要 |
PURPOSE:To prevent the starting of an alarm sound monitor by the operation of halting an alarm sound by prohibiting the start of the alarm sound monitor until a specified time elapses after the halting of the alarm sound. CONSTITUTION:As soon as the contents coincide between a time counter 10 and an alarm memory 11, a coincidence signal from a coincidence detection circuit 12 is outputted to set an RS type FF17 and an alarm sound is generated from an alarm output unit 13. When a switch 7 is operated to stop the alarm sound, the RS type FF17 is reset to halt the alarm sound. At the same time, a timer 22 starts to count. Even when the switch 7 is turned On with the output of the timer 22 at a level L, no monitor sound is generated from an alarm sound generator 13 because AND gates 15 and 16 are in OFF state. |
