Table 71: Network Class A; Table 72: Network Class B; Table 73: Network Class C - WAGO -I/O-SYSTEM 750 Manual

210 Fieldbus Communication
IP Addresses
To allow communication over the network each fieldbus node requires a 32 bit
Internet address (IP address).
IP Address must be unique!
For error free operation, the IP address must be unique within the network.
The same IP address may not be assigned twice.
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 71: Network Class A

e. g.
01100101
0
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 72: Network Class B

e. g.
10110101
10
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 73: Network Class C

e. g.
11000101
110
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'.
Manual
1.5.0
750-882 Media Redundancy ETHERNET Controller
101 . 16
00010000
Net ID
181 . 16
00010000
Net ID
201 . 16
00010000
Net ID
WAGO-I/O-SYSTEM 750
. 232
11101000
Host ID
. 232
11101000
Host ID
. 232
11101000
. 22
00010110
. 22
00010110
. 22
00010110
Host ID