PLC Variables & Data Types Explained | Structured Text Programming Basics
Every PLC program—no matter how complex—is built on one simple concept: Variables.
In this video, we continue our Structured Text series by breaking down one of the most important foundations of PLC programming—Variables and Data Types.
You’ll learn:
What a variable is in a PLC
How PLC memory works (bits, bytes, and data storage)
Why choosing the correct data type is critical
Common PLC data types:
BOOL (Boolean)
INT, DINT, SINT (Signed Integers)
UINT, UDINT, USINT (Unsigned Integers)
REAL and LREAL (Floating-point values)
STRING (Text data)
Signed vs Unsigned numbers explained
Arrays and how they simplify large programs
Introduction to advanced types like STRUCT, timers, and function blocks
Best practices for variable naming in real industrial projects
This video is perfect for PLC beginners, automation engineers, and students who want to write clean, efficient, and professional Structured Text programs.
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