Category: PLCs

Last week I had the privilege of visiting Automation Direct near Atlanta. I was hosted by Chad Crowe, who does online marketing and social media for the company. He contacted me a month or so ago after my post on …

Automation Direct Field Trip! Read More »

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Today’s post continues the series on PLC platforms started last year. This is another guest post from Steve Myres, who also wrote an article on Indirect Addressing. Articles in this series include Allen-Bradley, Siemens, Koyo and Panasonic platforms. I wrote …

Idec PLCs Read More »

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Since I started this blog in early 2011 I have written a lot of articles on PLCs. The PLC is a major part of many industrial facilities and machines, and indeed has been an important part of my career. Now …

PLC Articles – Software and Hardware Read More »

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Last week I posted a fairly straightforward question at the end of my post on PLC Scanning. I then shared the post on Linked In as well as on my company’s Facebook page. One reason I share these posts on …

Ladder Logic 105 Scanning Solution Read More »

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Just an update on my PLC Trainer project. These are two of the Allen-Bradley Micrologix 1400 Trainers along with the Fischertechnik models I mentioned in my last post. The program and documentation for the Color Sorter, shown at left, is completed. …

Fischertechnik and PLC Trainers Read More »

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Today’s post relates to a new method I am using to teach some of my advanced classes. In a basic PLC training class, pushbuttons and pilot lights built into a trainer are used to complete exercises, usually in order to …

Ladder Logic 306: Simulation Read More »

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This post is another guest post from MRO Electric. I thought it was an interesting topic. ************************************************************************ PLC Security In The Heating Industry: Keep Your Friends Close, and Your Enemies Closer No one understood or more succinctly described strategies and …

PLC Security Read More »

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Today’s post is in answer to a question from Bruno on my last post on Faults and Messages. Bruno asks “If two faults happen at the same time, will this procedure work?” This is a more complex question than it …

Ladder Logic 403: Message Scrolling and Multiple Faults Read More »

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This post is another in my series on Ladder Logic. As with the other posts in this series, I am using generic logic and addressing so that it can apply to various PLCs. In previous posts in this series I …

Ladder Logic 209: Faults and Messages Read More »

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Well, its official. I have my first actual PLC trainers, in addition to the ones on the wall in My Little Factory. I think they’re awesome! They did take 8 weeks to build, but as more are made I think …

My New Trainers! Read More »

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Today’s post is a continuation of the series on PLC Ladder Logic I started several years ago; for more of these post click on the PLC tab at the top of the site. In particular this continues my discussion of …

Ladder Logic 208: System Routine 2 Read More »

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Today’s post, as promised last week, is written by Ryan McCarthy, a reader of this blog. While I always offer to place a reciprocal link to the website of whoever contributes guest posts to this site, amazingly Ryan is neither …

Unitronics Read More »

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This post is the first in a series I am writing about a project I am working on, hence the “April 2017” designation. As most of my regular readers know, I have spent much of the past several years teaching …

My Little Factory – April 2017 Read More »

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Today’s post is extracted from my new “generic” PLC course manual, PLC Hardware and Programming – Multi-Platform. In the manual, I also cover the origins of the computer, beginning with the Babbage Analytical Engine, all the way back in 1823! …

Birth of the Programmable Controller Read More »

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