Rockwell Automation 440R Guardmaster EtherNet/IP Network Interface User Manual - Manual (Page 27)

Rockwell Automation Publication 440R-UM009B-EN-P - February 2014 27
Configure the Interface for Your EtherNet/IP Network Chapter 3
Use DHCP Software to
Configure Your Interface 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 interface. A DHCP
server typically assigns a finite lease time to the offered IP address.
When 50% of the leased time has expired, the interface attempts to renew its IP
address with the DHCP server.
The possibility exists that the interface will be assigned a different IP address,
which would cause the interface to cease communicating with the ControlLogix
controller.
Chapter Summary This chapter provided instructions on how to configure Guardmaster
EtherNet/IP Interface modules through the RSLogix 5000 software and
included information on configuration requirements and setting the network
address.
ATTENTION: To avoid unintended control or loss of control, the interface
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 interface.
Failure to observe this precaution may result in unintended machine motion or
loss of process control.