PLC State Machines Explained — Sample Demonstration

In this tutorial, I break down what a state machine is, why they're essential for writing clean PLC code, and then we build one together from scratch in Siemens TIA Portal. If your ladder logic has ever turned into an unreadable mess of interlocks and latches, state machines are the fix.
We'll cover:
- What a state machine is and why PLC programmers use them
- The core components: states, transitions, and actions
- How to structure a state machine in ladder logic
- Common pitfalls and how to avoid them
- Live build of a working state machine in TIA Portal

Whether you're new to PLC programming or looking to clean up years of spaghetti code, state machines are one of the most valuable tools you can add to your programming toolbox.

Resources
PLC used in this tutorial: https://amzn.to/4cgkOPa
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