Method for transmitting a data telegram between a real-time domain and a non-real-time domain and a coupling unit

Procedure for the transmission of a data telegram (118) from a domain not in real time (102) to a domain in real time (104) with the following steps: - generating a data telegram (118) not in real time with a data area (120), wherein the data telegram contains a real-time identification and identification not in real time (122), and wherein the data telegram contains an identification of the data telegram ( identification i) in the user data area (120), when the real-time identification (122) is present, - transmission of the data telegram (118) not in real time across the domain is not in real time (102) to a coupling unit (110); - Verification (126) of the data telegram not in real time to determine the presence of real-time identification (122) through the coupling unit (110), - for the case the real-time identification (122 ) is present; transmission of useful data and real-time identification (ID i) from the user data area (120) of the data telegram (118) not in real time to a user interface (128) node coupling time, memorization of the user data in the memory area (134) of a communication memory (132), which is associated to the identification, - cyclic processing of a broadcast list (123) containing identification data telegram (identification i) telegram no real-time data, which access the communication memory for generating a data telegram in real time.