WAGO-I/O-SYSTEM 750
Fieldbus Communication 205
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
Therefore, the address range of Class C networks in the first byte is always
between 192 and 223.
•
Additional network classes (D, E):
are only used for special tasks.
Key Data
Table 76: Key Data Class A, B and C
Possible number of
Network Class
Address range of
the subnetwork
Networks
Hosts per
Network
Class A
1.XXX.XXX.XXX ...
126.XXX.XXX.XXX
127
(2
7
)
Approx. 16 Million
(2
24
)
Class B
128.000.XXX.XXX ...
191.255.XXX.XXX
Approx. 16 Thousand
(2
14
)
Ca. 65 Thousand
(2
16
)
Class C
192.000.000.XXX ...
223.255.255.XXX
Approx. 2 Million
(2
21
)
254
(2
8
)
Each WAGO ETHERNET fieldbus coupler or controller can be easily assigned an
IP address via the implemented BootP protocol. For small internal networks we
recommend selecting a network address from Class C.
Note
Do not set IP addresses to 0.0.0.0 or 255.255.255.255!
Never set all bits to equal 0 or 1 in one byte (byte = 0 or 255). These are reserved
for special functions and may not be allocated. Therefore, the address 10.0.10.10
may not be used due to the 0 in the second byte.
If a network is to be directly connected to the Internet, only registered,
internationally unique IP addresses allocated by a central registration service may
be used. These are available from Inter
NIC
(International Network Information
Center).
Note
Internet access only by the authorized network administrator!
Direct connection to the Internet should only be performed by an authorized
network administrator and is therefore not described in this manual.
Subnets
To allow routing within large networks a convention was introduced in the
specification RFC 950. Part of the Internet address, the subscriber ID is divided
up again into a subnetwork number and the station number of the node. With the
aid of the network number it is possible to branch into internal subnetworks
within the partial network, but the entire network is physically connected together.
The size and position of the subnetwork ID are not defined; however, the size is
