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__separatorData Persistencedl-breadcrumb-item__separatorDeclaring VAR PERSISTENT Variables
dl-pagination__prev-inactivedl-pagination__prev-activedl-pagination__next-inactivedl-pagination__next-active
Declaring VAR PERSISTENT Variables dl-permalink__symbolPermalink

Below you will declare persistent variables in a persistent variable list and in a POU.

Requirement: A project is opened and contains a program POU. You have selected the option for the textual view in the “Declaration Editor” category of the options (menu command in “Tools  Options”).

  1. Add the “Persistent Variables” object to the application object with the menu command “Project  Add Object”.

    CODESYS adds the persistent variable list _cds_icon_gvl_persistence“PersistentVars” below the application object in the device tree and the editor opens.

  2. In the editor, enter a variable declaration, for example ‎ivarpersist1 : INT;‎ between ‎VAR_GLOBAL PERSISTENT RETAIN‎ and ‎END_VAR‎.

  3. Double-click the POU in the device tree.

    The editor of the POU opens.

  4. Specify the following declaration in the declaration part:

    ‎VAR PERSISTENT RETAIN‎

    ‎ivarpersist2‎ : INT;

    ‎END_VAR‎

  5. Click “Build  Build”.

    The message view opens. If CODESYS has compiled the application without errors, then close the message window and continue with the next step. Otherwise, correct the error(s) and select the menu command “Build  Build” again.

  6. Set the focus in the “PersistentVars” editor. Click “Declarations  Add All Instance Paths”

    CODESYS adds the persistent variable from the persistent variable list “PersistentVars” to the POU:

    ‎// instance path of the persistent variables created‎

    ‎POU.IVARPERSIST2 : INT‎