A method for redundant transmission of data telegrams between automation devices of an installation by a communication network requires a ring topology. A sending device sends out two data telegrams in different transmission directions of the communication network and a receiving device processes the data telegram arriving at the receiving device first and discards the other data telegram as a duplicate. To ensure fast transmission of data telegrams having important content, the sending automation device assigns a priority level and data telegrams having a high priority level are sent according to a first communication protocol and data telegrams having a low priority level are sent according to a different second communication protocol. A network component arranged between the sending device and the receiving device receives the data telegram, recognizes the priority level based on the communication protocol used, and forwards the data telegram taking into consideration the priority level.
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