Rockwell Automation 1738-AENT, Series B ArmorPOINT I/O Dual Port EtherNet/IP Adapters User Manual - Manual (Page 32)

22 Rockwell Automation Publication 1738-UM005A-EN-P - July 2013
Chapter 3 Configure the Adapter with RSLogix5000 software
Use DHCP Software to
Configure Your Adapter DHCP (Dynamic Host Configuration Protocol) software automatically assigns
IP addresses to client stations logging onto a TCP/IP network.
DHCP is based on BootP and maintains some backward compatibility. The main
difference is that BootP was designed for manual configuration, while DHCP
allows for dynamic allocation of network addresses and configurations to newly
attached devices.
Be cautious about using DHCP software to configure your adapter. A DHCP
server typically assigns a finite lease time to the offered IP address.
When 50% of the leased time has expired, the adapter attempts to renew its IP
address with the DHCP server.
The possibility exists that the adapter will be assigned a different IP address,
which would cause the adapter to cease communicating with the ControlLogix
controller.
See Configure the Adapter with Fixed IP Address on page 49 to configure the
adapter with a fixed IP address.
Chapter Summary In this chapter, you learned about the EtherNet/IP network you must configure
with an IP address, Subnet mask, and optional Gateway address. The following
chapter provides information on how to configure your adapter for direct
connection using RSLogix5000.
ATTENTION: To avoid unintended control or loss of control, the
I/O adapter must be assigned a fixed IP address. A dynamically provided
IP address should be used only at initial configuration. If a DHCP server is
used, it must be configured to assign the same IP address to your adapter.
Failure to observe this precaution may result in unintended machine motion
or loss of process control.