Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual - Manual (Page 23)

Rockwell Automation Publication ENET-UM001L-EN-P - March 2014 23
Configure an EtherNet/IP Communication Module to Operate on the Network Chapter 3
9. To permanently assign this configuration to the module, wait for the
module to appear in the Relation List panel and select it.
10. Click Disable BOOTP/DHCP.
When power is recycled, the module uses the assigned configuration and
does not issue a BOOTP request.
Use DHCP Software
Dynamic Host Configuration Protocol (DHCP) 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 allows for manual configuration (static), while DHCP allows for
both static and dynamic allocation of network addresses and configurations to
newly attached modules.
Be cautious when using DHCP software to configure a module. A BOOTP
client, such as the EtherNet/IP communication modules, can start from a DHCP
server only if the DHCP server is specifically written to also handle BOOTP
queries. This is specific to the DHCP software package used. Consult your
system administrator to see if a DHCP package supports BOOTP commands
and manual IP allocation.
IMPORTANT If you do not click Disable BOOTP/DHCP, on a power cycle, the host
controller clears the current IP configuration and begins sending
BOOTP requests again.
ATTENTION: The EtherNet/IP communication module must be assigned a
fixed network address. The IP address of this module must not be dynamically
provided.
Failure to observe this precaution may result in unintended machine motion or
loss of process control.