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PLC for beginners: the basics, in plain English.

Never heard of automation or a PLC? You are in the right place. Twelve short chapters explain how machines do jobs by themselves, and how people write the rules they follow.

Begin chapter 112 chapters · about 43 minutes
  • Every new word is explained
  • Something to try in every chapter
  • About 3 minutes each
Know this already? Go to the guided labs

How every automatic machine works

  1. 1 NoticeA sensor spots a person walking up.
  2. 2 DecideThe PLC checks its rule: someone is close, so open.
  3. 3 ActA motor slides the door open.

Then it checks again, about 50 times every second.

An automatic door, a traffic light and a whole factory all work this way. The basics explain each part.
What is inside

Four parts, twelve short chapters

  1. Part 1

    What is automation?

    Machines that do a job by themselves, and the people who set them up.

    1. What is automation?
    2. How factories work
    3. What engineers do
    3 chapters · 9 min
  2. Part 2

    Inside a control system

    The box that decides, the signals it uses and the screens people watch.

    1. What is a PLC?
    2. Inputs and outputs
    3. TRUE and FALSE
    4. HMI and SCADA
    4 chapters · 14 min
  3. Part 3

    Writing the rules

    From a plain-English rule to your first line of code.

    1. Rules in plain English
    2. Your first line of code
    3. The scan
    3 chapters · 12 min
  4. Part 4

    Before your first lab

    The two big brands, and the four ways to write a rule.

    1. Siemens and Allen-Bradley
    2. Four ways to write a rule
    2 chapters · 8 min
By the end

What you will be able to do

  • Spot automation in everyday life, and say how it works.
  • Name the parts of a control system and what each one does.
  • Read a simple PLC rule and say what the machine will do.
  • Choose Siemens or Rockwell, and know what to learn next.
After the basics

Then you get your hands on the code

  1. Two guided labsFill a tank and run a pump with your own code, one step at a time.
  2. The courseOne idea at a time, each practised on a working machine.
  3. Practice missionsReal jobs to solve, all the way up to running a whole factory.