dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorProgramming with CODESYSdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorCODESYS Development Systemdl-breadcrumb-item__separatorProgramming of Applicationsdl-breadcrumb-item__separatorDeclaration of Variables dl-breadcrumb-item__separatorDeclaring global variables
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Declaring global variablesdl-permalink__symbolPermalink
Declaring global variables that are available within the application.

Requirement: A project is open.

  1. In the Device tree of your project, select the application in which the global variables are to be valid.

  2. Select the context menu command “Add Object  Global Variable List”.

    CODESYS inserts the “GVL” in the Device tree under the application and opens it in the editor.

  3. Select the menu command “Edit  Auto Declare”.

    The dialog box “Auto Declare” opens.

  4. In the selection list “Scope”, select the entry “VAR_GLOBAL”.

  5. In the field “Name”, enter a name for the global variable.

  6. Select a data type from the selection list “Type”.

  7. If your variable is to have an initialization value other than the standard initialization value, click on _cds_icon_input_assistent next to the field “Initialization”.

    The dialog box “Initialization Value” opens.

  8. Double-click on the cell “Init value” of your variable and enter the desired valid value.

  9. Click on “OK”.

    The initialization value is displayed in the dialog box “Auto Declare”.

  10. Activate one of the “Flags” if necessary.

  11. Confirm your entries by clicking on the button “OK”.

    CODESYS inserts the declared variable in the GVL.

    The global variable is available in the total application of your project.

Declaring global variables that are available in the entire project.

  1. Select the menu command “View  POUs”.

    The “POUs” view opens.

  2. In the “POUs” view, select the uppermost node with the project name and select the context menu command “Add Object  Global Variable List”.

    CODESYS inserts the “GVL” in the “POUs” view and opens it in the editor.

  3. Select the menu command “Edit  Auto Declare”.

    The dialog box “Auto Declare” opens.

  4. In the selection list “Scope”, select the entry “VAR_GLOBAL”.

  5. In the field “Name”, enter a name for the global variable.

  6. Select a data type from the selection list “Type”.

  7. If your variable is to have an initialization value other than the standard initialization value, enter it in the column “Initialization”.

  8. Activate one of the “Flags” if necessary.

  9. Confirm your entries by clicking on the button “OK”.

    CODESYS inserts the declared variable in the GVL.

    The global variable is now available in the entire project.