204 Fieldbus Communication
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
IP Addresses
To allow communication over the network each fieldbus node requires a 32 bit
Internet address (IP address).
Note
IP Address must be unique!
For error free operation, the IP address must be unique within the network.
As shown below there are various address classes with net identification (net ID)
and subscriber identification (subscriber ID) of varying lengths. The net ID
defines the network in which the subscriber is located. The subscriber ID
identifies a particular subscriber within this network.
Networks are divided into various network classes for addressing purposes:
•
Class A:
(Net ID: Byte 1, Host ID: Byte 2… Byte 4)
Table 73: Network Class A
e.
g.
101
. 16
. 232
. 22
01100101 00010000 11101000 00010110
0
Net ID
Host ID
The highest bit in Class A networks is always ‘0’. This means the highest byte can
be in a range of’0 0000000’ to ‘0 1111111’.
Therefore, the address range of a Class A network in the first byte is always
between 0 and 127.
•
Class B:
(Net ID: Byte 1 … Byte 2, Host ID: Byte 3… Byte 4)
Table 74: Network Class B
e.
g.
181
. 16
. 232
. 22
10110101 00010000 11101000 00010110
10
Net ID
Host ID
The highest bits in Class B networks are always ’10’. This means the highest byte
can be in a range of’10 000000’ to ‘10 111111’.
Therefore, the address range of Class B networks in the first byte is always
between 128 and 191.
•
Class C:
(Net ID: Byte 1 … Byte 3, Host ID: Byte 4)
Table 75: Network Class C
e.
g.
201
. 16
. 232
. 22
11000101 00010000 11101000 00010110
110
Net ID
Host ID
The highest bits in Class C networks are always ‘110’. This means the highest
byte can be in a range of’110 00000’ to ‘110 11111’.