Rockwell Automation 1756-NEX Nexus Module User Manual
Page 31
About the NeXUS Network 3-5
Publication 1756-UM524B-EN-P - December 2008
Each node on the same physical network must have an IP address of the same class and
must have the same nework or multicast ID. Each node on the same network must have a
different host ID, giving it a unique IP address.
IP addresses are written as four decimal integers (0-255), separated by periods, where each
integer gives the value of one byte of the IP address.
You can distinguish the class of an IP address from the first integer in its dotted-decimal
IP address as follows:
For more information on Internet addressing, see Comer, Douglas E; Internetworking with
TCP-IP, Volume 1: Protocols and Architecture; Englewood Cliffs, N.J.: Prentice-Hall,
1990.
EXAMPLE
For example, the 32-bit IP address:
10000010 00000000 00000000 00000001 is written as 130.0.0.1.
Range of first integer
Class
0 -127
A
128 -191
B
192 - 223
C
224 - 239
D
240 - 255
Experimental
TIP
Contact your network administrator or the Network Information Center
for a unique fixed IP address to assign to your module.
Class A
Class B
Class C
Network ID
host ID
host ID
host ID
0
0 1
0
1
0
1
0
0
1
1 1
8
8
8
16
16
16
24
24
24
31
31
31
Class D
Multicast ID
host ID
0 1
1
1 1
16
31
Network ID
Network ID
24
0