Abstract: A field device for an industrial process includes a digital isolator which electrically divides the field device into a primary side for low voltage electronics from a secondary side. A device power supply located in the secondary side is configured to provide power to a process control device which monitors or controls a process variable of the industrial process. A latching relay located in the secondary side couples to the process control device and the device power supply and has a set input to responsively couple the device power supply to the process control device and a reset input which causes the latching relay to enter an electrically open state to thereby disconnect the device power supply from the process control device. A controller located in the primary side is configured to generate a switch signal.

Abstract: An industrial process field device includes an active component, a latching relay, a controller, a relay drive, and a reset circuit. The active component may be a sensor configured to sense a process parameter, or a control device configured to control a process of the industrial process. The controller is configured to generate a switch signal, and the relay drive is configured to set the latching relay in one of a set state and a reset state based on the switch signal. The reset circuit is configured to set the latching relay to the reset state in response to an interruption of electrical power to the relay drive.

Abstract: An industrial process field device includes an active component, a switch, a switch monitor, and a controller. The active component may be a sensor configured to sense a process parameter, or a control device configured to control a process of the industrial process. The switch is electrically coupled to first and second terminals and is configured to electrically connect the first and second terminals when in a closed state, and electrically disconnect the first and second terminals when in an open state. The switch monitor is configured to detect a current state of the switch corresponding to the closed or open state, and generate a state output indicating the current state. The controller is configured to set the switch in the open or closed state, and generate a notification based on the state output that indicates at least one of the current state of the switch and a condition of the switch.

Abstract: An industrial process field device includes an active component, a latching relay, a controller, a relay drive, and a reset circuit. The active component may be a sensor configured to sense a process parameter, or a control device configured to control a process of the industrial process. The controller is configured to generate a switch signal, and the relay drive is configured to set the latching relay in one of a set state and a reset state based on the switch signal. The reset circuit is configured to set the latching relay to the reset state in response to an interruption of electrical power to the relay drive.

Abstract: An industrial process field device includes an active component, a switch, a switch monitor, and a controller. The active component may be a sensor configured to sense a process parameter, or a control device configured to control a process of the industrial process. The switch is electrically coupled to first and second terminals and is configured to electrically connect the first and second terminals when in a closed state, and electrically disconnect the first and second terminals when in an open state. The switch monitor is configured to detect a current state of the switch corresponding to the closed or open state, and generate a state output indicating the current state. The controller is configured to set the switch in the open or closed state, and generate a notification based on the state output that indicates at least one of the current state of the switch and a condition of the switch.