What are the Most Popular PLC Programming Languages?

About this Video

• Video Title: What are the Most Popular PLC Programming Languages?
• Channel: RealPars
• Speakers: One speaker (name not provided in transcript)
• Duration: 00:09:31

Introduction

This video explores the five main PLC (Programmable Logic Controller) programming languages defined by the IEC 61131-3 standard: Ladder Diagram (LD), Sequential Function Charts (SFC), Function Block Diagram (FBD), Structured Text (ST), and Instruction List (IL). The video aims to describe each language, highlighting its advantages and disadvantages to help viewers understand their relative popularity.

Key Takeaways

• Ladder Diagram (LD): A graphical language modeled after relay logic, easy to understand and organize, but lacks some instructions for complex tasks. Most popular due to its historical roots and ease of transition for engineers familiar with relay logic.
• Sequential Function Charts (SFC): A graphical language using steps and transitions, similar to flowcharts but allowing multiple paths; useful for breaking down complex processes and troubleshooting.
• Function Block Diagram (FBD): A graphical language connecting input/output blocks; well-suited for motion control but can become disorganized and difficult to troubleshoot.
• Structured Text (ST): A textual, high-level language similar to Basic, Pascal, and C; powerful for complex algorithms and mathematical calculations but can have difficult syntax and online editing.
• Instruction List (IL): A textual language resembling assembly language; efficient for compact and time-critical code but has limited structuring possibilities and increased error potential. Ladder Diagram is deemed the most popular language overall.