Vital solid state controller

Details Vital solid state controller Vital solid state controller

2007-12-26

2011-10-04

Morano, IV, Joe (Department: 3617)

Railway switches and signals

Cab signal or train control

Magnetic rail

Reexamination Certificate

active

08028961

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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