Fisher-rosemount Systems, Inc

Robert Stock

Gary Keith Law

Kent Allan Burr

Example apparatus and methods to remove power from a field device are disclosed. An example apparatus includes a first switch to control power to the field device, and a second switch comprising a first gate and a second gate. The second gate is electrically coupled in parallel to the first gate, and the second switch is electrically coupled in series to the first switch. The example apparatus also includes a first diagnostics controller to control the first and second gates, a first processor to control the first switch, a third switch to control power to the field device, and a fourth switch comprising a third gate and a fourth gate. The fourth gate is electrically coupled in parallel to the third gate, and the fourth switch is electrically coupled in series to the third switch. The example apparatus also includes a second processor to control the third switch, and a second diagnostics controller to control the third and fourth gates.

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Austin, TX, United States of America

Robert Stock