Field device for a process plant and method for supplying the field device

摘要

In a field device, such as positioner, I / P converter or the like, for a process plant, comprising: an electrical input terminal to which an electrical power supply is connectable, an electronics unit for processing a process signal, an input circuit connected between the input terminal and the electronics unit for limiting an electrical supply voltage for the electronics unit, it is provided that the input circuit has a memory for electrical energy and power management electronics, which has a Energiesollwerterfasser for detecting and / or necessary for the processing of the process signal by the electronic unit required electrical energy target level , And that the power management electronics is adapted to the energy target level overshooting electrical energy amount of the voltage applied to the input circuit electrical power supply in the Memory to load.