System and method for the parallel transmission of real-time critical and non real-time critical data via switched data networks, especially ethernet

The invention relates to a system and method; the system and method for is connected with the user and coupling unit (e.g., and data exchange network of distributed automatic system is), two time by cycling service real-time on, and non-real-time on communication. (12) And connecting units to exchange network data the user at least one for transmitting the real-time on data area of the so-called transmission cycle (13) and at least for transmitting the non-real-time on data area (14), thereby on real-time communication and non-real-time on corresponding to separate.