Hand-off-auto switch assembly with position detection and alarm circuit
OwnerArthur J. Marshallinventor
Life of this patent
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Abstract
A Hand-Off-Auto (“H-O-A”) toggle switch configured to be located between a supervisory PLC and a field device, the H-O-A toggle switch having a control circuit having Hand (manual), Off and Auto positions, and a switch position detection circuit with an alarm output to indicate that the H-O-A switch is not in the “Auto” position
Claims4
A Hand-Off-Auto (“H-O-A”) toggle switch configured to be located between a controller and a device, the H-O-A toggle switch comprising a control circuit having Hand (manual), Off and Auto positions, and a switch position detection circuit having corresponding Hand, Off, and Auto positions with an alarm output to indicate that the H-O-A switch is not in the “Auto” position, the control circuit and the switch position detection circuit linked by a switch mechanism configured to move the connections of the control circuit and the switch position detection circuit to corresponding positions.
A circuit board comprising a plurality of H-O-A toggle switches, each H-O-A toggle switch configured to receive a plurality of supervisory PLC outputs and to transmit control signals to a plurality of field devices, each H-O-A toggle switch comprising a control circuit having Hand (manual), Off and Auto positions, the circuit board further comprising a switch position detection circuit connected to each of said plurality of H-O-A toggle switches and to alarm circuit, said switch position detection circuit configured to activate said alarm circuit if any one of said plurality of H-O-A toggle switches is not in the “Auto” position.
Dependencies are inferred from the claim text.