Vital solid state controller
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United States of America Patent
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Oct 4, 2011
Grant Date -
Jul 31, 2008
app pub date -
Dec 26, 2007
filing date -
Dec 22, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.
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