Fault-tolerant failsafe computer system using COTS components
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United States of America Patent
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May 30, 2017
Issued Date -
N/A
app pub date -
Dec 26, 2013
filing date -
Dec 16, 2013
priority date (Note) -
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Abstract
A system includes a safety relevant component that generates a data packet in response to receiving a request to perform a task and that communicates the data packet. The system further includes a first fail-safe chassis (FSC) that continuously generates a first chassis health signal, that determines whether the data packet is valid, and that selectively determines whether to de-assert the first chassis health signal based on the determination. The system also includes a second FSC that continuously generates a second chassis health signal, that determines whether a copy of the data packet is valid, and that selectively determines whether to de-assert the second chassis health signal based on the determination. The system further includes a safety relay box module that determines whether to instruct the first FSC to operate in a predetermined mode based on the first chassis health signal and the second chassis health signal.
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