| 摘要 |
PURPOSE:To prevent A circuit scale from being so much enlarged even when the number of alarm signals is increased by executing alarm processing to an M-sequence of the alarm signals with time division. CONSTITUTION:A selector 3 selects the M-sequence of the alarm signals to be inputted with the time division by using a timing signal from a timing generating means 2 and successively outputs the signals to a T-time holding/protecting means 4. The T-time holding/protecting means 4 updates the continuing time of the alarm signal. When it is detected that the updated continuing time is T-time, the alarm output of an H level is sent (1-second protection) and updates the state of the stored alarm output. When it is detected that the timing signal continued for more than the T-time is interrupted, the state of the alarm output is set to an L level (1-second holding) when the T-time lapses after the detection. Thus, even when the number of the alarm signals is increased, the circuit scale is not enlarged so much. |
