Excavating
Patent
1992-06-12
1994-05-03
Canney, Vincent P.
Excavating
371 213, 371 27, G06F 1100
Patent
active
053094450
ABSTRACT:
A safety circuit for monitoring computer hardware that can create an unsafe condition if a failure occurs. The circuit includes a microprocessor, a keyword decoder, and a dynamic safety relay drive circuit. The microprocessor runs a set of internal tests which create a keyword made up of a series of bits. A particular series of bits indicates the desired operation of the microprocessor. On alternate generations of the keyword one bit in the series is inverted. The keyword decoder receives the keywords and output a "true" signal if the keyword indicates the desired operation of the microprocessor, and "false" signal if the keyword indicates otherwise. The output of the keyword decoder is transmitted to the dynamic safety relay drive circuit, and this signal will keep the circuit energized as long as its alternating. The position of the bit which is inverted is rotated through the keyword so that different bit paths through the keyword decoder may be tested.
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Canney Vincent P.
Honeywell Inc.
Johnson Kenneth J.
Leonard Robert B.
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