Rockwell Automation Publication 290E-UM001B-EN-P - June 2012 67
Chapter 3
Product Commissioning
IP Address
The IP address identifies each node on the IP network (or system of connected
networks). Each TCP/IP node on a network must have a unique IP address.
The IP address is 32 bits long and has a net ID part and Host ID part. Networks
are classified A, B, C, (or other). The class of the network determines how an IP
address is formatted.
Figure 38 - IP Address on the IP Network
You can distinguish the class of the IP address from the first integer in its
dotted-decimal IP address as follows:
Each node on the same physical network must have an IP address of the same
class and must have the same net ID. Each node on the same network must have
a different Host ID thus giving it a unique IP address.
Gateway Address
The Gateway Address is the default address of a network. It provides a single
domain name and point of entry to the site. Gateways connect individual physical
networks into a system of networks.
Subnet Mask
The subnet mask is used for splitting IP networks into a series of subgroups,
or subnets. The mask is a binary pattern that is matched up with the IP address
to turn part of the Host ID address field into a field for subnets.
Class A
Class B
Class C
Net ID
Net ID
Net ID
Host ID
Host ID
Host ID
0
0
0
1 0
1 1 0
7
8
15
23
16
31
31
31
24
0
Range of first integer Class Range of first integer Class
0…127 A 192…223 C
128…191 B 224…255 other
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