dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorProgramming with CODESYSdl-breadcrumb-item__separatorCODESYS Development Systemdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorProgramming of Applicationsdl-breadcrumb-item__separatorCreating Source Code in IECdl-breadcrumb-item__separatorStructured Text (ST), Extended Structured Text (ExST)dl-breadcrumb-item__separatorProgramming structured text (ST)
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Programming structured text (ST)dl-permalink__symbolPermalink

Principle

The programming languages 'Structured Text' and 'Extended Structured Text' are programmed in the ST editor. The program code consists of a combination of expressions and instructions, which can also be executed conditionally or in loops. You must conclude each instruction with a semicolon ‎;‎.

The variables are declared in the declaration editor.

Creating a POU in the structured text (ST) implementation language

  1. Select an application in the device tree.

  2. Select the command “Project  Add Object  POU”.

    The dialog box “Add POU” opens.

  3. Enter a name and select the “Implementation language”“Structured Text (ST)”. Click on “Add”.

    The POU is added to the device tree and opened in the editor.

    Now insert the variable declarations in the upper part of the POU and enter the ST program code in the lower part of the POU.