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Why You Should Use Normally Closed For Stop Buttons

You may know the difference between normally open and normally closed contacts, but do you know where to use them? This article will teach you where to use normally open and where to use normally closed for inputs and in your PLC program. You will learn how to connect your PLC program with the physical PLC inputs.

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Ladder Logic Symbols – All PLC Ladder Diagram Symbols

Ladder logic symbols are the basic building blocks for ladder diagrams. Right here you will find all the ladder diagram symbols which are described in IEC 61131-3. The symbols are available for download in all formats and in a PDF-file.

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Ladder Logic Examples and PLC Programming Examples

I will start this article by making a confession:

When I develop a PLC program, I steal other people’s ladder logic.

I am stealing ladder logic examples for inspiration and solutions to my PLC programs.

From time to time you will be facing the same problem, when you do PLC programming with ladder logic. By looking at examples of ladder logic programs, you will be able to find a solution to your problem very fast. You may even find a smarter solution in the ladder logic examples than your own solution.

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PLC Logic – The Logic Behind The PLC Program

This is an introduction to PLC logic. You can use PLC logic to build PLC programs with simple electrical circuit diagrams. In this article, I will use combinatorial logic to build the functionality of a PLC program.

And to get as close as possible to real a PLC programming language like ladder logic, the PLC logic in this article will be contacts and relays in an electrical circuit.

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About PLC Academy

Hi, I'm Peter, electrical engineer and PLC programmer.

Everyday I am exploring the world of PLC programming to find better solutions for automation. I believe everybody can become a PLC programmer with the right learning materials.

My goal with PLC Academy is to help you learn PLC programming.

Everyday I am exploring the world of PLC programming to find better solutions for automation. I believe everybody can become a PLC programmer with the right learning materials.

My goal with PLC Academy is to help you learn PLC programming.

- "Hey Collin, Thanks for your comment! I'm glad that you find my material useful, and of course you are more..." - peter
- "i need to write code for in ladder for a task with a conveyor with three color sencor and tree bin so when ..." - tryfom
- "guys does anybody know about textile industry ladder logic and how they work??" - M.koteswar
- "Hi Peter, Firstly, thanks for the post. I was wondering if you would allow me to use the IEC Ladder Log..." - Colin
- "I want a plc program for magnet cranes" - Umesh more

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