Introduction to Sequence Control!

Before You Start Programming

Before getting into actual programming, we explain the minimum knowledge you need to know. If you are already writing programs to a PLC, this section is not necessary for you. This guide is designed for those who are just beginning to learn sequence control — complete beginners are welcome.

What is Sequence Control?

A simple introduction to sequence control. If you're unsure about the basics, check it out here.

What is a PLC?

A PLC and a "sequencer" refer to the same device. Here is a simple explanation.

About Relays

Relay circuits are the foundation of sequence control. Start here as a complete beginner — explained clearly from scratch. Without understanding relays, mastering ladder diagrams will be very difficult.

Signal Input

Learn how to receive input signals from external devices such as sensors through a relay. When the sensor activates, the relay operates with a clicking sound.

Relay Control

Let's build a simple control circuit using relays.

Self-Holding Circuit

We'll create a self-holding mechanism, a fundamental concept in ladder diagrams, using a relay circuit. Understanding self-holding is essential for understanding ladder diagrams.

Ladder Diagram

The program written to a PLC. Ladder diagrams are the fundamental language of PLC programming.

Software Installation

Install the software used to create ladder diagrams.

What You Need

An introduction to the equipment and tools needed to practice sequence control.

Introduction to Sequence Control and Circuit Diagrams [2nd Edition]

Just This! Sequence Control

Understanding Sequence Control Best (Illustrated Structure Series)

The "Introduction to Sequence Control and Circuit Diagrams" is available as a Kindle edition (e-book). If you prefer a paperback, please select the paperback format, or purchase from the top page.