Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1985-03-18
1987-05-19
Heyman, John S.
Communications: electrical
Condition responsive indicating system
With particular system function
340 47, 340653, 377 30, 307442, B61L 2922, G08B 2100
Patent
active
046671846
ABSTRACT:
In an apparatus for counting enumeration input pulses according to the present invention, an enumeration input pulse is put in parallel in a plurality of stages of logical product computing oscillator means, and counting in the logical product computing oscillator means of the subsequent stage is advanced on condition that an output of termination of counting is put out from the logical product computing oscillator means of the precedent stage. For this purpose, delay means is arranged after the logical product computing oscillator means to set the time from the point of output of the logical product computing oscillator means of the precedent stage to the point of termination of a predetermined delay time so that this time is longer than the width of the enumeration input pulse and shorter than the frequency thereof. Furthermore, the logical product computing oscillator means makes an error at a time of a circuit failure in such a manner that no output is generated, and the delay time and enumeration input pulse make an error at a time of a circuit failure in such a way that a fail-safe effect is attained. Accordingly, enumeration input pulses can be counted with a fail-safe effect.
REFERENCES:
patent: 2858429 (1958-10-01), Heywood
patent: 2956181 (1960-10-01), Norman
patent: 3185864 (1965-05-01), Amodei et al.
patent: 4314237 (1982-02-01), Darrow
Futsuhara, Koichi and Inose, Katsuichi, "A Rearization of High Reliable Sensor," Dept. of Tech. Dev. and Dept. of Signal Eng., Nippon Signal Co., Ltd., Urawashi, Saitama 338.
Shome, T. K., "Timing Relays," Indian Railway Tech. Bull., pp. 1-6 (1979).
Heyman John S.
The Nippon Signal Co. Ltd.
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