Method for data transmission in an automation communication network comprising at least one distribution node (SW1, SW2) having multiple input/output interfaces (P0, P1, P2) that are each connected to a network segment (N1, N2, N3, N4), wherein the network segment (N1, N2, N3, N4) has at least one subscriber (TN A, TN B, TN C, TN D), wherein a data interchange takes place between the subscribers (TN A, TN B, TN C, TN D) in the form of telegrams (B, C, A1, A2), wherein the telegrams (B, C, A1, A2) have associated priority levels (200, 210, 220), wherein the sending of a telegram (B, A1, A2) having a first priority level (200, 220) on an input/output interface is interrupted by the at least one distribution node (SW1, SW2) if the at least one distribution node (SW1, SW2) has received a telegram (C, B) having a second priority level (210, 200), which comprises a higher significance than the first priority level (200, 220), on a further input/output interface (P1, P2), wherein the at least one distribution node (SW1, SW2) concludes the interrupted telegram having the first priority level (200, 220), which telegram forms a first fragment (B-1, A1-1), in a defined manner by virtue of the at least one distribution node (SW1, SW2) sending first fragmentation information at the end of the first fragment (B-1, A1-1), wherein the first fragmentation information comprises a fragment number of a second fragment (B-2, A1-2), wherein a remaining portion of the telegram having the first priority level (200, 220) that has not yet been sent by the at least one distribution node (SW1, SW2) forms the second fragment (B-2, A1-2), wherein the at least one distribution node (SW1, SW2) generates second fragmentation information for the second fragment (B-2, A1-2), wherein the second fragmentation information comprises a fragment index having the value of a fragment number of the first fragment (B-1, A1-2), wherein the at least one distribution node (SW1, SW2) buffer-stores the second fragment (B-2, A1-2) together with the second fragmentation information, wherein the at least one distribution node (SW1, SW2), after sending the telegram (C, B) having the second priority level (210, 300) on the input/output interface, sends the second fragment (B-2, A1-2) of the telegram (B, A1) having the first priority level (200, 220) together with the second fragmentation information on the input/output interface, and wherein an addressed subscriber (TN A, TN B, TN C, TN D) for which the telegram (B, A1) having the first priority level (200, 220) is intended assembles the first fragment (B-1, A1-1) and the second fragment (B-2, A1-2) of the telegram (B, A1) having the first priority level (200, 220) on the basis of the first and the second fragmentation information (340, 350). wherein a data interchange takes place between the subscribers (TN A, TN B, TN C, TN D) in the form of telegrams (B, C, A1, A2), wherein the telegrams (B, C, A1, A2) have associated priority levels (200, 210, 220), wherein the sending of a telegram (B, A1, A2) having a first priority level (200, 220) on an input/output interface is interrupted by the at least one distribution node (SW1, SW2) if the at least one distribution node (SW1, SW2) has received a telegram (C, B) having a second priority level (210, 200), which comprises a higher significance than the first priority level (200, 220), on a further input/output interface (P1, P2), wherein the at least one distribution node (SW1, SW2) concludes the interrupted telegram having the first priority level (200, 220), which telegram forms a first fragment (B-1, A1-1), in a defined manner by virtue of the at least one distribution node (SW1, SW2) sending first fragmentation information at the end of the first fragment (B-1, A1-1), wherein the first fragmentation information comprises a fragment number of a second fragment (B-2, A1-2), wherein a remaining portion of the telegram having the first priority level (200, 220) that has not yet been sent by the at least one distribution node (SW1, SW2) forms the second fragment (B-2, A1-2), wherein the at least one distribution node (SW1, SW2) generates second fragmentation information for the second fragment (B-2, A1-2), wherein the second fragmentation information comprises a fragment index having the value of a fragment number of the first fragment (B-1, A1-2), wherein the at least one distribution node (SW1, SW2) buffer-stores the second fragment (B-2, A1-2) together with the second fragmentation information, wherein the at least one distribution node (SW1, SW2), after sending the telegram (C, B) having the second priority level (210, 300) on the input/output interface, sends the second fragment (B-2, A1-2) of the telegram (B, A1) having the first priority level (200, 220) together with the second fragmentation information on the input/output interface, and wherein an addressed subscriber (TN A, TN B, TN C, TN D) for which the telegram (B, A1) having the first priority level (200, 220) is intended assembles the first fragment (B-1, A1-1) and the second fragment (B-2, A1-2) of the telegram (B, A1) having the first priority level (200, 220) on the basis of the first and the second fragmentation information (340, 350).