Systems safety vital arbiter employing numerical techniques
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United States of America Patent
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Dec 28, 1999
Grant Date -
N/A
app pub date -
Sep 19, 1997
filing date -
Sep 19, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A numerical vital relay driver serving as an independent arbiter of vital railway (control) system operation constituting a checkword translator for receiving system checkwords from a system processor in the form of 'N' bit NISAL parameters and for implementing a hardware algorithm utilizing the checkwords. It also consists of variable waveform data tables, including means for translating the data in the tables into a periodic signal, wherein it is insured that only if the checkwords are present and correct within a specific check period and the operation of the hardware algorithm is correct, will the desired periodic signal be produced.
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