| 摘要 |
A control circuit system of the type which continuously monitors its own performance so as to be self-checking, i.e., to produce a response whenever a system shows an absence of a condition being monitored or a change therein and also produces a response if the control system itself should become inoperative or otherwise malfunction, comprises: first and second sensor means (13, 14) for sensing the same event and generating signals which are comparable upon sensing the same event; signal comparing means (23) responsive to said signals from said first and second sensor means for generating a negation response in the absence of comparable signals and responsive to the presence of said comparable signals for generation comparison response; switching means (27) coupled to the output of said signal comparing means for alternately interrupting comparison of said signals in said comparison means in response to said comparison response and restoring comparison in response to said negation response; and utilization means (37) operable in response to the alternating operating of said switching means. |
