B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
354/225
B61L 3/00 (2006.01)
Patent
CA 1130923
VITAL ELECTRONIC CODE GENERATOR ABSTRACT OF THE DISCLOSURE A code generator is disclosed which includes a programmed micropro- cessor for transmitting a selected fixed frequency signal through optical isolators to tuned vital relay drivers. Feedback information from these drivers monitors their operation and checks operation of output circuitry. External time delays are provided to check program delays within the system and to ensure against the generation of erroneous codes due to cyclical reset- ting of the system. A rate selector is provided to permit selection of par- ticular output code rates and is cycle checked continuously to ensure that the system is always certain of the selected code. Unique programming func- tions are also provided for self checking and for checking the operation of the microprocessor against the operation of external components to provide total system integrity and total system reliability. Diversity and cycle checking are used throughout the system to provide vital qualities. The system has no failure bias and is entirely self checking. Any component or program failure or malfunction causes the system to shut down completely.
340135
Borden Ladner Gervais Llp
General Signal Corporation
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