Applications of a switched data network for real-time and non-real time communication

A method for clock-synchronized control of a first station in a switched data network by a second station of the switched data network, wherein communication between the stations of the switched data network takes place via one or more point-to-point connection in transmission cycles which are synchronous with one another, said transmission cycles being divided into a first part for the transmission of real-time-critical data and a second part for the transmission of non real-time-critical data, the method comprising the steps of:

• specifying for the transmission of real-time critical data within each station a transmission list and a reception list for a deterministic communication;
• acquisition of one or more actual values by the first station in synchronism with the communication cycles;
• transmitting a first data telegram with the actual value or values from the first station to the second station via the switched data network in the first part of a transmission cycle;
• determining a control error from the actual value or values and a set point value of the second station within the second station, and
• determining a manipulated variable from the control error by the second station;
• and
• transmitting a second data telegram from the second station to the first station in the first part of a subsequent transmission cycle with the manipulated variable;
• wherein for said first and second data telegram it is specified in one of said transmission lists, respectively in which transmission cycle the data telegram is to be transmitted.