Manual VIPA CPU 21x Chapter 5 Deployment CPU 21x-2BT02 with H1 / TCP/IP
HB103E - Rev. 05/45 5-9
Ethernet and IP addresses
A station is addressed by means of the Ethernet address, which is also
known as the MAC address. The Ethernet addresses of stations in a net-
work must be unique.
Ethernet addresses consist of the following elements:
0020D5 xxx xxx
Multicast circuit no.
Sub-address (freely selectable)
Sub-address (company-specific)
(VIPA: 0020D5)
The Ethernet address has a length of 6Byte. The first 3Byte are defined by
the manufacturer. These 3Byte are assigned by the IEEE-Committee. The
last 3Byte may be defined as required.
The network administrator determines the Ethernet address.
The broadcast address (to transmit messages to all stations on the
network) always is:
FFFFFFFFFFFFh
The IP address is a 32Bit address that must be unique within the network.
The IP address consists of 4 numbers that are separated by a dot.
The structure of an IP address is as follows:
xxx.xxx.xxx.xxx
Range: 000.000.000.000 to 255.255.255.255
The network administrator also defines IP addresses.
The broadcast address (transmit a message to all stations) is always:
255.255.255.255
Attention!
Certain IP addresses are restricted! These addresses are reserved for
special services!
Structure of an
Ethernet address
IP address
structure
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