Publication 1763-UM001E-EN-P - June 2015
Connecting to Networks via Ethernet Interface 223
The host system’s BOOTP configuration file must be updated to service
requests from MicroLogix 1100 controllers. The following parameters must be
configured:
When BOOTP is enabled, the following events occur at power-up:
• The processor broadcasts a BOOTP-request message containing its
hardware address over the local network or subnet.
• The BOOTP server compares the hardware address with the addresses
in its look-up table.
• The BOOTP server sends a message back to the processor with the IP
address and other network information that corresponds to the
hardware address it received.
With all hardware and IP addresses in one location, you can easily change IP
addresses in the BOOTP configuration file if your network needs to be
changed.
The BOOTP request can be disabled by clearing the BOOTP Enable
parameter in the channel configuration file. When both BOOTP Enable and
DHCP are cleared (disabled), the MicroLogix 1100 uses the existing channel
configuration data.
Parameter Description
IP Address A unique IP Address for the MicroLogix 1100 controller.
Subnet Mask Specifies the net and local subnet mask as per the standard on subnetting
RFC 950, Internet Standard Subnetting Procedure.
Gateway Specifies the IP address of a gateway on the same subnet as the
MicroLogix 1100 that provides connections to another IP network.
You can use any commercially available BOOTP
server. If you do not have BOOTP Server capabilities
on your network, and you want to dynamically
configure Channel 1, you can download the free
Rockwell Automation BOOTP server from the
Rockwell Automation website. Go to
www.ab.com/networks/bootp/index.html
If BOOTP is disabled, or no BOOTP server exists on
the network, you must use RSLogix 500 programming
software to enter/change the IP address for each
processor or you must use DHCP instead of it.
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