Abstract: A device for the extraction of user data out of Ethernet telegrams sent from a field device comprises an input interface and an output interface for connecting to an Ethernet data line, wherein the input interface is designed to receive Ethernet telegrams transmitted via the Ethernet data line; an electronics unit which is designed to evaluate the received Ethernet telegrams and to extract a value of at least one process variable out of the user data portions of the received Ethernet telegrams; and an output unit for outputting the determined process variables. The invention also relates to a system comprising the device according to the invention.