Below are the available programming languages of the IEC61131-3 standard:

SFC: Sequential Function Chart
FBD: Function Block Diagram
LD: Ladder Diagram
ST: Structured Text
IL: Instruction List

Use of ST instructions in graphic languages

You have to select a language for each program or User Defined Function Block of the application.

Programming languages - Overview

IEC 61131-3 Automation platform > Programming - Reference guide > Programming languages - Overview

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