Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 61
Connect to the Controller Chapter 2
Set the Controller IP Address with the DHCP Server
Because the CompactLogix 5480 controllers are DHCP-enabled when they
are in the out-of-box condition, you can use a DHCP server to set the
IP address.
The DHCP server automatically assigns IP addresses to client stations logging
on to a TCP/IP network. DHCP is based on BOOTP and maintains some
backward compatibility.
ATTENTION: You can use a DHCP server that is configured to always assign
the same IP address to specific devices when they appear on the EtherNet/IP
network and request an IP address.
If your system does not use a DHCP server that assigns the same IP address for
specific devices, we strongly recommend that you assign the controller a
fixed IP address. Do not set the IP address dynamically. That is, do not use the
Obtain IP settings automatically by using DHCP.
When a controller uses Obtain IP settings automatically by using DHCP, the IP
address for that controller is cleared with each power cycle. If the same IP
address is not automatically assigned to the controller when it requests a new IP
address, the controller can be assigned a new IP address.
The use of a new IP address can have unintended consequences. For example, a
Duplicate IP Address condition can exist or the controller can experience
configuration faults because the IP address differs from what is stored in the
Logix Designer application project.
Failure to observe this precaution can result in unintended machine motion or
loss of process control.
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