ABC Trainings
PLC SCADA & Automation

Structured Text PLC Programming Tutorial for Beginners 2026

Learn Structured Text PLC programming — syntax, examples, and free practice tools. The language AI writes best.

AB
ABC Trainings Team
April 2, 2026 — 3 min read
Current source of truth · reviewed 16 Aug 2026

Current official PLC, SCADA and Industry 4.0 evidence

This article may predate the current ABC automation records. Use the reviewed workshop evidence and current course pathway for enrolment decisions.

  • 268 instructional hours in the complete PLC, SCADA, panel-design and Industry 4.0 pathway
  • The exact PLC & SCADA course is 80 hours; the separate Industry 4.0, Industrial IoT, AI and Digital Twin component is 24 hours
  • 34 automation or Industry 4.0 operations records are marked completed; five completed records have 29 workshop-photo records
  • The photographed session supports AI-assisted PLC-code workshop activity, not physical PLC hardware proof
  • No independent attendance audit, completed learner-project proof, placement outcome or salary outcome is claimed by the reviewed evidence
Review the current evidence →Open the current automation pathway →

What is Structured Text?

Structured Text PLC Programming Tutorial for Beginners 2026
Real student workshop at ABC Trainings

Structured Text (ST) is one of five IEC 61131-3 PLC programming languages. Unlike Ladder Logic which is graphical, ST is text-based — similar to Pascal or Python. It is the most powerful PLC language, handling complex calculations, data manipulation, and communication protocols. Most importantly, AI tools generate ST far more accurately than any other PLC language.

Why Learn ST in 2026?

AI tools like ChatGPT and Claude write excellent ST code. Modern PLCs from Beckhoff, CODESYS, and B&R use ST as primary language. It is closest to traditional programming, making skills transferable. Industry 4.0 projects rely heavily on ST for data handling and complex logic.

Basic Syntax

Structured Text PLC Programming Tutorial for Beginners 2026
Real student workshop at ABC Trainings

Variables: BOOL for on/off, INT for whole numbers, REAL for decimals, TIME for durations, STRING for text. IF-THEN-ELSE for decisions. CASE for state machines. FOR loops for repeating. TON timer for delays. CTU counter for counting.

Example: Motor with Temperature Protection

IF StartButton AND NOT StopButton AND Temperature less than 80 THEN Motor true and RunningLight true. ELSIF StopButton OR Temperature 80 or above THEN Motor false. IF Temperature 80 or above THEN OverheatAlarm true. This is readable English-like code that any engineer can understand.

Where to Practice Free

CODESYS (free, codesys.com) with built-in simulation. OpenPLC Editor (free, open source) for all IEC 61131-3 languages. Both run on your laptop without PLC hardware.

Is ST harder than Ladder Logic?

Different, not harder. Electricians prefer LD. Engineers with any programming exposure prefer ST. Both achieve the same results.

Which language do employers prefer?

In India, LD is most common. But ST knowledge increasingly required for Industry 4.0 and AI-assisted development.

Learn at ABC CAD and IT Trainings

ABC CAD and IT Trainings offers comprehensive courses across five centres in Maharashtra — Osmanpura, CIDCO, Wagholi, Hadapsar, and Sangli. With 11 years of training excellence and over 2000 students trained, we provide hands-on, industry-relevant education using 100 percent free tools. Visit abctrainings.in or call to enrol today.

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