238 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 9 Use I/O Modules with CompactLogix 5370 L3 Controllers
Local Expansion Modules
CompactLogix 5370 L3 control systems support the use of Compact I/O
modules as local expansion modules along a CompactBus backplane.
Consider the following when using local expansion modules:
• The controllers support this many local Compact I/O modules across up
to three I/O banks, that is, the local bank and two more banks.
• When possible, use specialty Compact I/O modules to meet unique
application requirements.
• Consider using a 1492 wiring system for each I/O module as an alternative
to the terminal block that comes with the module.
• Use 1492 PanelConnect™ modules and cables if you are connecting input
modules to sensors.
Install Local Expansion Modules
Complete these steps to install local expansion modules in your
CompactLogix 5370 L3 control system:
1. Attach the 1769 Compact communication or I/O modules as described in
these publications:
• Compact I/O Modules Installation Instructions, publication
1769-IN088
• Compact I/O DeviceNet Scanner Module Installation Instructions,
publication 1769-IN060
2. If your system uses only a local bank, complete these steps.
a. Use the tongue-and-groove slots to attach a 1769-ECR Compact I/O
end cap terminator to the last module in the system.
b. Move the lever of the end cap bus terminator fully to the left until it
clicks to lock the end cap bus terminator.
Cat. No. Local Expansion Modules
Supported, max
1769- L30ER
1769-L30ERM
1769-L30ER-NSE
8
1769-L33ER
1769-L33ERM
16
1769-L36ERM 30
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