Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 246)

Publication 1747-UM011G-EN-P - June 2008
246 Communicating with Devices on an Ethernet Network
Using Subnet Masks and
Gateways Configure subnet masks and gateways by using the Ethernet channel
1 configuration screen.
If your network is divided into subnetworks that use gateways or
routers, you must indicate the following information when configuring
channel 1.
• Subnet mask
• Gateway address
A subnet mask is a filter that a node applies to IP addresses to
determine if an address is on the local subnet or on another subnet. If
an address is on another subnetwork, messages are routed through a
local gateway to be transferred to the destination subnetwork.
If your network is not divided into subnets, then leave the subnet
mask field at the default.
Subnet Mask Tasks
IMPORTANT
If BOOTP is enabled, you can’t change any of the advanced
Ethernet communication characteristics.
If you are Then
manually configuring channel 1
and have a network with subnets
• be sure the BOOTP enable field is disabled.
• use your programming software to enter the subnet
mask and gateway address.
using BOOTP to configure channel
1 and have a network with
subnets
• be sure BOOTP is enabled.
• include the subnet mask(s) and gateway address(es).