Note: Updated For 2023

You can learn a lot about PLC programming from books. Everything from ladder logic and structured text, to how to use specific PLC platforms like the Siemens S7-1200.

In this collection below you will find all the best PLC programming books. Some of them are free to download as pdf and some are sold as books or e-books.

The reason I made this collection is because there are many different PLC programming books out there. And not all of them are equally good. You don’t want to waste time or money on a book that is not good.

Online you will find many different types of PLC programming books. Most of them are about [...]

Welcome to the second part of my ladder logic tutorial. In part 1 of the ladder logic tutorial, I introduced you to the very basics of ladder logic and to some basic instructions.

In this second part of the tutorial I will teach you how to solve actual problems with ladder logic and how to use it to build PLC programs. At the same time you will be introduced to several other ladder logic instructions:

A PLC counter is a function block that counts up or down until it reaches a limit. When the limit is reached the output is set.

The thing is that counting is in fact widely used in PLC programming. Often you will have the need to counts different things. An example of this could be to keep track of how many times a process has been completed. Or how many products has been produced.

SCADA stands for “Supervisory Control and Data Acquisition”.

That’s a mouthful, which is why engineers often refer to it as a “SCADA System”, or just “SCADA”.

This tutorial will cover an introduction to SCADA systems and architecture, SCADA applications, and SCADA programming. i.e. all the basics you need to know about SCADA systems.

Some of the most essential functions in PLC programming are the timers. Time in PLC programs is used almost everywhere from delaying the start of a motor to prolonging a signal. PLC timers are used exactly for that. Although they at first can seem confusing it doesn’t take a lot to understand how they work and how to use them.

When it comes to automation and manufacturing ISA-88 or just S88 is inevitable.

It is a standard for published by The International Society of Automation (ISA) that sets out models and terminology addressing batch control. The standard was published in an attempt to standardize and thereby making it easier for automation suppliers to integrate, communicate and configure batches. It is adopted by Europe as IEC 61512-1.

Today, the standard is used by most manufacturers and automation suppliers that deal with batch control. Especially productions of food and medicine utilizes if not the whole, then at least parts of the standard to keep track of their batch production.

Do you want to learn how to program PLCs?

There are many great PLC training courses out there (some of them are even free). But many of them are of poor quality and even misleading. That’s why I created this guide—so that you can find the best one for your needs!

This guide will help you figure out which course is right for you, what type of content it includes, and if it’s worth the cost or not.

Whether you want to learn Allen Bradley (Rockwell Automation), Siemens, Omron, or Factory Automation—we’ve selected the Top PLC Training for your needs.

Let’s jump right into the Best Online PLC Training Courses of 2023.

What is PLC Training?PLC training is [...]

Do you know how to scale your analog input? Or wire your analog output?

Many people struggle with analog signals in PLC programming. The wiring and how to use an analog input or output in your PLC program can be tricky. Most often you will see digital example PLC programs and in my Structured Text Tutorial most of the examples are digital programs.

I’m writing this article because many of you wanted to learn how to use analog signals in PLC programming. Analog signals are used widely in PLC programs but also often used in a SCADA system. So how do you connect that 4-20mA analog transmitter to your PLC and use it in your PLC program? How do you scale an analog [...]

One of the official and widely used PLC programming languages is the Function Block Diagram (FBD). It is a simple and graphical way to program any functions together in a PLC program. Function Block Diagram is easy to learn and provides a lot of possibilities.

One of the best visual programming languages is a PLC programming language called ladder logic or ladder diagram (LD).

The great thing about ladder logic is that it’s much more visual than most programming languages, so people often find it a lot easier to learn.

The smart thing about ladder logic is that it looks very similar to electrical relay circuits. So if you already know a little bit about relay control and electrical circuits, you can learn ladder logic even faster.

But that’s definitely not a requirement, and I myself didn’t understand relays when I first learned ladder logic.

Welcome to the first chapter of my Arduino Tutorial for Beginners. In this chapter, you will learn the very basics of the Arduino platform so that you can start programming. I will teach you how to set up your computer and write your first program for the Arduino Uno board.

Do you also struggle reading your own and other huge ladder diagrams?

The truth is, that even though ladder logic is an easy programming language for beginners, it can be very hard to read and understand. That’s why some consider Structured Text to be a better PLC programming language – and you can learn all about it in this tutorial.

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.

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.

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.