Patent ID: 8289734

Claim:
An output apparatus comprising: a first source of a first signal having a first state or a different second state; a second source of a second signal having a first state or a different second state; and a circuit structured to output a vital output including a first state when the first state of the first signal corresponds to the first state of the second signal and, otherwise, including a different second state, wherein at least one of the first signal and the second signal is a static signal, wherein the other one of the first signal and the second signal having the first state is a dynamic signal, wherein when at least one of the first signal has the different second state of the first signal and the second signal has the different second state of the second signal, the vital output includes the different second state of the vital output, wherein said circuit comprises an alternating current to direct current converter structured to output the vital output including the first state as an energized direct current signal responsive to the first state of the first signal being an energized direct current signal and the first state of the second signal being two dynamic signals of opposite phase, wherein said alternating current to direct current converter comprises a transformer including a primary winding having a center tap and two ends, and a secondary winding, and a rectifier cooperating with the secondary winding, wherein the energized direct current signal of the first state of the first signal is structured to energize the center tap, wherein the two dynamic signals of opposite phase are coupled to the two ends of the primary winding, wherein said secondary winding applies an alternating current signal to said rectifier to provide the energized direct current signal of the first state of the vital output, wherein the first source comprises a first processor, wherein the second source comprises a second processor, and wherein both of the first and second processors monitor the two ends of the primary winding.