Fieldbus Communication • 103ETHERNETWAGO-I/O-SYSTEM 750ETHERNET TCP/IP4.1.3.2 Communication ProtocolsIn addition to the ETHERNET standard, the following importantcommunication protocols are implemented in the WAGO ETHERNET based(programmable) fieldbus couplers and controllers:• IP Version 4 (Raw-IP and IP-Multicast )• TCP• UDP• ARPThe following diagram is intended to explain the data structure of theseprotocols and how the data packets of the communication protocols Ethernet,TCP and IP with the adapted application protocol MODBUS nested in eachother for transmission. A detailed description of the tasks and addressingschemes of these protocols is contained in the following.Fig. 4-8: Communication Protocols G012907e
