FIELD DEVICE COUPLING UNIT AND SYSTEM

摘要

The invention relates to a field device coupling unit (10; 20; 30) for providing a supply voltage (2) to a field device (5) and for communicating with a superordinate controller (1). The field device coupling unit (10) has a current interface (3) that is designed for communication with the controller (1) and has a first actuatable input load (4) designed to provide a load voltage (7), which is the basis for the supply voltage (2), from an interface current (6) of the current interface (3). The field device coupling unit (10) further comprises a circuit assembly (8) for providing a communication signal (25) which is to be transmitted to the controller. The circuit assembly (8) is designed to actuate the first actuatable input load (4) according to the communication signal (25) in order to thus superimpose the interface current (6) with a current signal (9) which corresponds to the communication signal (25).