Sunday, September 16, 2018

Online Ladder Logic Simulations

Some of you know how much I’m loving being back in the classroom as a Visiting Assistant Professor at the University of Hartford College of Engineering, Technology and Architecture (CETA). I started in January for the spring semester and am fortunate to have been invited back for the fall semester. CETA offers both BS Engineering Technology and BS Engineering degrees with students having the following options:

  • Engineering, with its emphasis on theory, analysis, and design, 
  • Technology, which teaches engineering technology, with an emphasis on hands-on application of theory; or
  • Architecture, with its emphasis on a combination of design and application of theory.
I’ve had the opportunity to teach both Engineering Technology and Engineering courses. In the spring I taught the second half of a digital electronics course. In that course we spent considerable time working with Quartus, an Intel CAD system used to design digital circuits. 

Over the summer I had some time and experimented a bit with PLC Fiddle - a really nice
online ladder logic simulator for testing, training, and code sharing. Using PLC Fiddle I’ve put together a set of logic gate simulations linked hereUsing the simulations the user can turn inputs on and off for various logic gates (AND, OR, NAND, NOR, EXOR and NEXOR) and observe the outputs. Here’s a screen shot of the simulations. 

If you follow the link below the screen shot you'll go to the simluation website where you can turn Input 1 and Input 2 ON and OFF (OFF = Logic 0, ON = Logic 1) by clicking the boxes next to Input 1 and Input 2 in the left hand column. As you change the Inputs, watch how the Output changes for each gate type. 

I’m not teaching a digital course this semester but if you are - feel free to share and use the simulations in your classes. And - if you are a faculty person, current student, former student, already have your AS or AAS degree and want to continue, etc, etc and are interested in an excellent Engineering, Engineering Technology or Architecture BS degree program - I can help connect you with the right people at the University of Hartford. My Hartford email address is You can contact me any time!

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