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. 👉 Subscribe to Mr. Smart – Let's Learn Things for more practical automation tutorials and real-world PLC programming concepts. 🔑 Keywords PLC variables, PLC data types, structured text variables, PLC programming basics, PLC memory explained, bits and bytes in PLC, BOOL data type PLC, INT vs DINT PLC, signed vs unsigned PLC, REAL data type PLC, floating point PLC, STRING in PLC, arrays in structured text, PLC programming tutorial, IEC 61131 3 data types, automation programming basics, PLC coding for beginners, industrial automation PLC, structured text tutorial, PLC variable naming best practices 🔖 Hashtags #PLC #StructuredText #PLCProgramming #IndustrialAutomation #AutomationEngineering #ControlSystems #PLCTraining #EngineeringEducation #Variables #DataTypes #ProgrammingBasics #SmartEngineering #MrSmartEngineering #AutomationLearning #Mechatronics