Fail-safe acknowledging circuit

Details Fail-safe acknowledging circuit Fail-safe acknowledging circuit

G - Physics

08

B

346/63

G08B 21/00 (2006.01) B61L 3/00 (2006.01)

Patent

CA 1097787

(Case No. 6852) FAIL-SAFE ACKNOWLEDGING CIRCUIT ABSTRACT OF THE DISCLOSURE A rail-safe solid-state acknowledging circuit for a cab signaling system requiring an acknowledgment after the reception of a more restrictive speed command signal employing a plurality of transistor latching circuits having a prede- termined order of more restrictive significance. Each of the transistor latching circuits is coupled to one input of a separate two input OR gate while a separate a.c. transistor amplifier is coupled to the other input of each or the two input OR gates. The outputs of the OR gates along with an acknowledging switch controlled voltage are coupled to the inputs of a multiple input AND gate for normally holding the AND gate in a signal passing condition and for causing the AND gate to assume a signal blocking condition when a more restrictive speed command signal is received onboard a vehicle.

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