Beckhoff BC9000 Documentation page 12

Product overview
Basic principles
The Internet Protocol (IP)
The internet protocol (IP) forms the basis of this data communication. IP transports data packets from one
device to another; the devices can be in the same network, or in different networks. IP here looks after the
address management (finding and assigning MAC-IDs), segmentation and routing. Like the Ethernet
protocol, IP does not guarantee that the data is transported - data packets can be lost, or their sequence can
be changed.
TCP/IP was developed to provide standardised, reliable data exchange between any numbers of different
networks. TCP/IP was developed to provide standardised, reliable data exchange between any numbers of
different networks. Although the term is often used as if it were a single concept, a number of protocols are
layered together: e.g. IP, TCP, UDP, ARP and ICMP.
Transmission Control Protocol (TCP)
The Transmission Control Protocol (TCP) which runs on top of IP is a connection-oriented transport protocol.
It includes error detection and handling mechanisms. Lost telegrams are repeated.
User Datagram Protocol (UDP)
UDP is connectionless transport protocol. It provides no control mechanism when exchanging data between
sender and receiver. This results in a higher processing speed than, for example, TCP. Checking whether or
not the telegram has arrived must be carried out by the higher-level protocol.
Internet Control Message Protocol (ICMP)
It is used by end devices, to exchange information about the current status of the internet protocol.
Address Resolution Protocol (ARP)
Performs conversion between the IP addresses and MAC addresses.
BootP
The BootP protocol allows the TCP/IP address to be set or altered, by addressing the network device with its
MAC-ID.
12 Version: 4.0.0 BC9000 and BC9100