Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 179)

Publication 1785-UM012D-EN-P - July 2005
Communicating with Devices on an Ethernet Network 11-5
Using BOOTP to Enter Configuration Information
BOOTP is a protocol that will supply the controller with configuration
information at power-up. BOOTP lets you dynamically assign IP addresses to
controllers on the Ethernet link.
To use BOOTP, a BOOTP server must exist on the local Ethernet subnet.
The server is a computer (either a personal computer, VAX, or UNIX system)
that has BOOTP-server software installed and reads a text file containing
network information for individual nodes on the network.
Advanced Functions
Broadcast Address The broadcast address to which the
controller should respond. See page 11-9 for information about advanced network functions,
including the use of broadcast addressing.
This function does not allow for sending one message simultaneously to
multiple PLC-5E controllers.
Subnet Mask The controller’s subnet mask.
The subnet mask is used to interpret IP
addresses when the network is
divided into subnets.
See page 11-11 for information about subnetworks and gateways.
Gateway Address The IP address of the gateway that
provides a connection to another IP
network.
This field is required when you
communicate with other devices not
on a local subnet.
See page 11-11 for information about subnetworks and gateways.
Link ID A DH+ link number
Use the link ID number to identify the
network when configuring a
ControlLogix system using the
Gateway software.
Enter a link ID number. The valid range is 0-199.
This Field Specifies Configure by Doing the Following
You can also use BOOTP to obtain
subnet masks and gateway addresses.
See page 11-12.