PLC Programming #5: User-Defined Data Types (UDTs) Explained

In this tutorial, I break down User-Defined Types (UDTs) — one of the most powerful tools for writing clean, scalable PLC code. If you've ever found yourself copying the same data structure across dozens of blocks, this one's for you.

We'll cover:
What User-Defined Types (UDTs) actually are and why they exist
How UDTs let you create custom data structures for your projects
Using UDTs inside Data Blocks, Function Blocks, and arrays
How UDTs keep your code consistent and dramatically easier to maintain
Updating a UDT once and having changes propagate across your entire project
Live demo in Siemens TIA Portal (concepts apply to any platform)
Whether you're managing a handful of motors or scaling up to hundreds of identical stations, UDTs are how you stop repeating yourself and start programming like a professional.

Resources
PLC used in my tutorials: https://amzn.to/4siePyZ
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