Abstract: The disclosure includes a voltage output circuit for use in a process automation field device, the voltage output circuit including an op-amp configured to supply the output voltage. The output circuit's op-amp is connected to the process automation system though a normally open switch. The normally open switch is closed only when the voltage output circuit is properly powered and operating. An improper connection of a power supply to the voltage output circuit will not power the voltage output circuit, and thus the switch remains open and protects the voltage output circuit from power being drawn in from the improper connection. The disclosure includes also a transceiver circuit having similar power draw protection.

Abstract: A device for wireless communication with a process automation field device. The device may include an inductive interface in the field device embodied to couple with a complementary inductive interface of a service tool. The field device inductive interface may be embodied to inductively transfer data to the service tool and to inductively receive data and energy from the service tool. The energy received from the service tool may be sufficient for operating the field device's inductive interface. A method of wireless communication is also disclosed.

Abstract: A device for wireless communication with a process automation field device. The device may include an inductive interface in the field device embodied to couple with a complementary inductive interface of a service tool. The field device inductive interface may be embodied to inductively transfer data to the service tool and to inductively receive data and energy from the service tool. The energy received from the service tool may be sufficient for operating the field device's inductive interface. A method of wireless communication is also disclosed.