Method for operating a communication network, communication network and controller

A communication network comprising a first participant and a second participant,

• wherein the first participant transmits a clocked data sequence to the second participant,
• wherein the data sequence contains a datagram as a write datagram which contains a header, an intermediate field following the header and a data field following the intermediate header, wherein the header, the intermediate field and the data field in each case have one or more data units, and wherein a length of the intermediate field is matched to a clock frequency of the data sequence and a response time of the second participant, and
• wherein the second participant reads the header of the datagram, defines input data depending on the content of the header and records the input data in the datagram while the data sequence passes through the second participant.

A controller for a communication network, the communication network having a participant,

• wherein the controller generates a clocked data sequence and forwards the clocked data sequence to the participant of the communication network, the data sequence containing a write datagram which contains a header, an intermediate field following the header and a data field following the intermediate field,
• wherein the header, the intermediate field and the data field comprise one or more data units, and
• wherein a length of the intermediate field is matched to a clock frequency of the data sequence and a response time of the participant.