MicroLogix-1400-Expansion-IO-PortThe MicroLogix 1400's base I/O can be expanded using 1762  I/O modules. In this article we'll describe the details of how this is accomplished.

The right front of the MicroLogix 1400 has a small cover over top of a 1762 I/0 expansion port, and the first step in adding 1762 I/O to a MicroLogix 1400 is to power down the unit, and remove the cover.

Next, you'll find that your 1762 expansion I/O modules come with a ribbon cable and connector on the left side. Also on the front right of the expansion module you'll find another small cover over the top of an additional expansion I/O port.

MicroLogix-1400-Expansion-IO-1762-IO-ConnectorTo install your 1762 expansion module, simply plug the ribbon cable connector into the MicroLogix 1400's expansion I/O connector and replace the cover. Then, to connect additional 1762 expansion I/O modules, remove the expansion cover from the first module and plug the second module into it, replacing the cover when done.

Repeat this process until you have installed all your 1762 expansion modules, or have reached the power limit of the MicroLogix 1400's expansion bus.

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MicroLogix-1400-Expansion-IO-with-Expansion-IOTo simplify the selection of expansion modules, Rockwell designed the MicroLogix 1400 to accept up to any seven 1762 I/O modules. This is three more than the MicroLogix 1100, and different from the MicroLogix 1200 which supports 3 and 6 modules based on their current draw.

Well, that's it for today's article about MicroLogix 1400 expansion I/O. For more information on the installation of MicroLogix 1400 expansion I/O, see the manufacturer's installation instructions HERE.

MicroLogix-1400-Expansion-IO-with-Expansion-IO-2And if you've have any comments, questions, or corrections, please feel free to fill out the “post a comment or question” for at the bottom of the page.


Shawn Tierney
Automation Instructor and Blogger
If you enjoyed my article, you may like my courses at TheAutomationSchool.com

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Shawn Tierney
Shawn began sharing automation news and know-how online in 1996 when he launched his first BBS. Then in 1999 he moved to the internet launching ShawnMichael.com, which he later renamed ShawnMTierney.com. In 2013 he moved his automation efforts to a new website, TheAutomationBlog.com, which has since become the most popular independent industrial automation blog on the web. Today Shawn works full time teaching online courses on Programmable Controllers, HMI, and SCADA on his training website, TheAutomationSchool.com.