A guided path from zero to a working project

Learn the idea. Try the logic. Build your confidence.

Twenty-one short lessons take you from PLC basics to planning and simulating a complete control task. Follow the suggested order, practice, and keep notes in your own words.

21lessons with practice

Your course progress

0 of 21 complete

Virtual inputs

Change these values before running a single scan.

Expected outputs to program

Build the path to each outputSeries contacts mean AND. Parallel paths mean OR. A normally closed contact conducts when its tag is OFF.

Program preview

Your results will appear here.

Optional practice tools and references

Try Open Industry online, or use the included Windows package for LDmicroWebSim.

Open Industry Project

Browser factory scenes with a built-in PLC and a working subset of Ladder Diagram and Structured Text. Its maintainers describe it as early in development.

Open simulator ↗
View GitHub project ↗

LDmicro Web Simulator · optional Windows tool

The Windows bundle is part of the local project copy, separate from this website. A web page cannot start Windows apps; use Open Industry for browser-based practice.

Simulator information ↗
View original project source ↗

Standards and vendor reference

IEC 61131-3 describes PLC programming languages. Controller manuals explain details for a specific platform.

PLCopen language overview ↗
Siemens manual example ↗
PLCopen safety overview ↗
PLC Dojo fundamentals ↗

Practice boundary: These labs are simplified learning simulations. They are not connected to machinery and do not design or verify machine safety functions. Real equipment requires platform manuals, a risk assessment, and qualified review.

Learn the idea. Try the logic. Build your confidence.

Write the logic and try the cases

Virtual inputs

Expected outputs to program

Find where the signal path breaks

What the PLC and equipment show

Optional practice tools and references