ALLEN BRADLEY 1747-L551 PLC Processor

G–6 Communicating with Devices on an Ethernet Network
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 uses the existing channel
configuration data.
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. See page G–5 for that configuration
procedure.
The host system’s BOOTP configuration file must be updated to
service requests from SLC 5/05 processors. The following
parameters must be configured:
Parameter
IP Address
Subnet Mask
Gateway
Note:
Description
A unique IP Address for the SLC 5/05 processor.
Specifies the net and local subnet mask as per the standard on
subnetting RFC 950, Internet Standard Subnetting Procedure.
Specifies the IP address of a gateway on the same subnet as the
SLC 5/05 that provides connections to another IP network.
If you do not have BOOTP Server capabilities on your
network, and you want to dynamically configure
Channel 1, contact your local Allen-Bradley
representative to obtain a free BOOTP Utility diskette.
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 in the BOOTPTAB file.
• 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.
Using DOS/Windows BOOTP
The optional BOOTP Server diskette contains DOS-based and
Windows-based BOOTP server utilities. Both provide BOOTP
services for SLC 5/05 processors. Regardless of the platform you are
using, you must:
• install the boot-server utility
• edit the boot-server configuration file
• run the boot-server utility
Publication 1747-6.2