Rockwell Automation 1734-AENT, Series B POINT I/O EtherNet/IP Adapter Module User Manual - Manual (Page 29)

Rockwell Automation Publication 1734-UM018B-EN-E - October 2013 19
Configure the Adapter with RSLogix5000 software Chapter 3
IP Address
The IP address identifies each node on the IP network (or system of connected
networks). Each TCP/IP node on a network (including the adapter) must have a
unique IP address.
The IP address is 32 bits long and has a Network 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
.
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 network ID. Each node on the same network must
have a different Host ID thus 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
.
IMPORTANT If using the BootP/DHCP utility, you need to know the Ethernet
hardware address of your adapter. Rockwell Automation assigns each
1734-AENT adapter a unique 48-bit hardware address at the factory.
The address is printed on a label on the side of your 1734-AENT
adapter as shown in the figure. It consists of six hexadecimal digits
separated by colons. This address is fixed by the hardware and cannot
be changed.
If you change or replace the 1734-AENT adapter, you must enter the
new Ethernet hardware address of the adapter when you configure
the new adapter.
Class A
Class B
Class C
Network ID
Host ID
Host ID
Host ID
0
0
0
10
0
110
7 8
15 16
31
31
31 23 24
Network ID
Network ID
Range of first integer Class Range of first integer Class
0 1…127 A 192…223 C
128…191 B 224… 255 other
EXAMPLE For example, the 32-bit IP address:
10000000 00000001 00000000 00000001 is written as
128.1.0.1