WAGO 750-341 Manual page 119

TCP segment
The packet header of a TCP data packet is comprised of at least 20 bytes and
contains, among others, the application port number of the transmitter and the
receiver, the sequence number and the acknowledgement number.
The resulting TCP packet is used in the data unit area of an IP packet to create
a TCP/IP packet.
5.3.3.3 UDP
The UDP protocol, like the TCP protocol, is responsible for the transport of
data. Unlike the TCP protocol, UDP is not connection-orientated; meaning
that there are no control mechanisms for the data exchange between
transmitter and receiver. The advantage of this protocol is the efficiency of the
transmitted data and the resulting higher processing speed.
5.3.3.4 ARP
ARP (Address Resolution Protocol).
This protocol combines the IP address with the physical MAC address of the
respective Ethernet card. It is always used when data transfer to an IP address
takes place in the same logical network in which the sender is located.
5.3.4 Application Protocols
In addition to the communication protocols described above, various
application protocols are implemented in the WAGO ETHERNET Coupler.
These protocols allow the user easy access to the fieldbus nodes:
• MODBUS TCP (UDP)
• Ethernet/IP
Further protocols serve for the administration and diagnosis of the system:
• BootP
• HTTP
• DHCP
• DNS
• SNTP
• FTP
• SNMP.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
ETHERNET
Network Communication
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