dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorProgramming with CODESYSdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorCODESYS Development Systemdl-breadcrumb-item__separatorTesting and Debuggingdl-breadcrumb-item__separatorResetting applications
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Resetting the application stops the program and resets the variables to their initialization values. Depending on the type of reset, retain variables and persistent variables are also reset.

  • Reset warm: All variables are reset, except ‎RETAIN‎ and ‎PERSISTENT‎ variables.

  • Reset cold: All variables are reset, except ‎PERSISTENT‎ variables.

  • Reset origin: All variables are reset.

  • Reset origin device: All variables are reset and all applications are deleted.

The following sample program and statements clarify the functionality of the various resets.

Sample program

Example

Declaration

VAR
	iVar: INT := 0;
END_VAR
VAR RETAIN 
	iVarRetain: INT :=0;
END_VAR 
VAR PERSISTENT 
	iVarPersistent : INT:= 0;
END_VAR

Implementation

iVar := 100;
iVarRetain := 200;
iVarPersistent :=300;

  1. Insert the “Persistent Variables” object below the application and open it in the editor.

  2. Click “Build  Build”.

  3. Click “Declare  Add All Instance Paths”.

    The instance path of the persistent variables is inserted.

  4. Download the application to the controller.

Executing a "Reset warm", "Reset cold", and "Reset origin"

Requirement: The sample program runs on the controller.

  1. Click “Online  Login” to switch to online mode.

  2. Monitor the variables ‎iVar‎, ‎iVarRetain‎, and ‎iVarPersistent‎.

  3. Click “Online  Reset Warm”.

    You are prompted whether you really want to execute the command.

  4. Click “Yes” to confirm the dialog.

    The application is reset. The ‎iVar‎ variable is set to the initialization value 0. Both of the other variables retain their values.

  5. Click “Online  Reset Cold”.

    You are prompted whether you really want to execute the command.

  6. Click “Yes” to confirm the dialog.

    The application is reset. The ‎iVar‎ and ‎iVarRetain‎ variables are set to the initialization value 0. The ‎iVarPersistent‎ variable retains its value.

  7. Click “Online  Reset Origin”.

    You are prompted whether you really want to execute the command.

  8. Click “Yes” to confirm the dialog.

    The application is reset. All variables are reset to their initialization values.