Abstract: The invention relates to a communication system for an agricultural machine and an agricultural machine comprising such a communication system. The invention further relates to a method of manufacturing such an agricultural machine. The communication system for an agricultural machine comprises a main control device, which is configured as a central computing and control unit for controlling machine functions, preferably such as the positionally accurate switching on and off of distribution and/or processing processes; and at least one auxiliary operating component which is configured to perform an operating function assigned to it as a function of control data from the main control device and/or independently. The main control device and the at least one auxiliary operating component each have at least one Ethernet interface for connection to an Ethernet data network, for sending and/or receiving data via the Ethernet data network during the control of machine functions.