Rockwell Automation Publication ENET-IN002H-EN-P - August 2017 35
Install a 1769 EtherNet/IP Adapter Chapter 3
System Configuration
Follow these rules when planning your system configuration.
• The adapter must be the first and left-most module in the system (the first
module of Bank 1). See page 36
for an example configuration.
• The adapter can communicate with up to 30 modules in a system that is
distributed across three I/O banks.
• An end cap/terminator must be on the last I/O bank.
• Each bank of I/O must have its own power supply.
• A bank of I/O can have a maximum of 16 modules with a maximum of
eight on either side of the power supply, depending upon module loading
on the supply.
• A 1769 I/O power supply has limits in the amount of 5V DC and
24V DC current it can supply to the modules in its I/O bank. These limits
depend on the catalog number (for example, 1769-PA2) of the supply. A
bank of modules should not exceed the current limits of the I/O bank
power supply. See the Compact 1769 Expansion I/O Power Supplies
Installation Instructions, publication 1769-IN028
.
• The maximum amount of current the system supports in one direction
(either side of the power supply) is: 2 A @ 5V DC, 1 A @ 24V DC.
• If another bank of I/O is required due to module requirements or I/O
loading, you can use a cable to link them together. You can have a
maximum of three banks of I/O connected with up to two
communication cables.
• Each module type has its own distance rating (the number of modules
from the power supply). Each module must be within this rating for its
type.
• The adapter has a distance rating of five, therefore the adapter must be
within five modules of the power supply.
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