Publication 1747-UM011G-EN-P - June 2008
Communicating with Devices on an Ethernet Network 243
installed and reads a text file containing network information for
individual nodes on the network.
The host system’s BOOTP configuration file must be updated to
service requests from SLC 5/05 processors. The following parameters
must be configured.
Configurable BOOTP Parameters
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 change.
The BOOTP request can be disabled by clearing the BOOTP Enable
parameter in the channel Configuration File. When BOOTP Enable is
cleared (disabled), the SLC 5/05 processor uses the existing channel
configuration data.
Parameter Description
IP Address A unique IP Address for the SLC 5/05 processor.
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
SLC 5/05 processor that provides connections to another IP network.
TIP
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.html
IMPORTANT
If BOOTP is disabled, or no BOOTP server exists on the network,
you must use SLC 500 programming software to enter/change
the IP address for each processor.
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