MicroLogix 1100 Installation and Mounting

MicroLogix-1100-Installation-Instructions-FiThe MicroLogix 1100 use to come with an extensive installation document referred to as, “installation instructions.” However, these days it seems the best way to get a copy of that document is electronically from Rockwell’s website HERE.

While these “installation instructions” cover many different topics, in this blog article I’ll be focusing on the installation and mounting of the controller itself.

MicroLogix-1100-TopTo allow for installation in the widest temperature range possible, the MicroLogix 1100 programmable controller is vented on the top, bottom, and left side. This venting is for convection cooling of the internal circuits of the controller. In order to allow sufficient air to flow through the vents, you need to allow for two inches (50mm) of spacing on the three vented sides.

The MicroLogix 1100 should only be mounted horizontally. And it’s very important not to allow any debris to fall inside the unit’s vents. Metal filings or wire strands which fall into the MicroLogix can damage or destroy it’s internal circuits.

To aid in avoiding such occurrences, the MicroLogix 1100 comes equipped with a protective debris strip installed on the top of the unit. This strip should MicroLogix-1100-Leftnot be removed until after all panel wiring and drilling above where the unit will be mounted is complete, and the MicroLogix 1100 itself is installed and wired.

The MicroLogix 1100 should also not be powered on while the protective strip is installed. If this caution is not followed, the controller’s circuits could overheat and become permanently damaged.

MicroLogix-1100-BackWhile most installations will find the MicroLogix 1100 mounted to a din rail, four mountings holes are also provided for surface mounting. When used, they are typically utilized to mount the Micro directly to the backpanel of an electrical enclosure using #8 or M4 screws.

To aid in surface mounting installations, the product’s, “Installation Instructions,” includes a “mounting template” foldout on the last page to aid in spacing mounting holes accurately.

Well, that’s in for today’s article reviewing the installation and mounting of a MicroLogix 1100 programmable controller. For more information about installing the MicroLogix 1100, you can find the complete manufacturer’s installation instructions HERE.

And if you’ve have any comments, questions, or corrections, please feel free to fill out the “leave a reply” for at the bottom of the page.


Shawn Tierney
Automation Consultant
Insights In Automation

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