PLC Decision Logic | IF, ELSE, ELSIF & Nested IF - Structured Text

Publié le: 28 juin 2026
sur la chaîne: Mr. SMART Engineering

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In this video, you'll learn one of the most important concepts in PLC Structured Text programming—decision making using IF, ELSE, ELSIF, and Nested IF statements.

After learning variables and data types in the previous video, it's time to understand how a PLC actually uses those values to make intelligent decisions.

This tutorial explains:

Difference between Declaration and Implementation sections
Variable assignment using := operator
IF statement
ELSE statement
ELSIF statement
Nested IF conditions
PLC scan sequence
Execution order in Structured Text
Common programming mistakes
Industrial programming examples
Best practices for writing clean and readable PLC code

Whether you're learning **CODESYS, TwinCAT, Beckhoff, Siemens Structured Text, or IEC 61131-3 programming**, this lesson builds the foundation for writing reliable industrial automation programs.

📚 Previous Videos in this PLC Structured Text Series:
✅ Introduction to Structured Text
✅ Variables & Data Types
✅ IF ELSE Logic (This Video)

Coming Next:
▶ Boolean Logic (AND, OR, XOR, NOT)
▶ CASE Statement
▶ Loops (FOR, WHILE, REPEAT)
▶ Functions & Function Blocks
▶ Timers & Counters
▶ Real Industrial PLC Projects

👍 If you enjoyed the video, don't forget to Like, Share, and Subscribe to Mr. Smart Engineering for more automation and PLC programming tutorials.

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