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Error (Data Integrity Check): The POU '...' has no valid safety seal.

The seal of the POU mentioned in the error message is not valid. This may indicate a data corruption or manipulation.

Further Info
Refer to the topic "Safety Violation Messages and Data Integrity Errors" for background information.

Remedy

The error message relates to the order of worksheets in the mentioned POU. Perform the steps described below and verify that the worksheet order is correct.

How to inspect the cause for a data integrity error message and confirm the verification

  1. In the Error List (MESSAGES window), double-click the error message to jump to the affected editor position.

    (Alternatively, select 'Jump' from the context menu.)

  2. Inspect the order of worksheets, i.e., the tab order in the editor group and verify its correctness.

    • If the order is not correct, try to correct it by dragging the tabs with the left mouse button. If no correction is possible, the project is damaged and cannot be used any longer. The data integrity error will persist and the project cannot be built.

      You can then try to copy the data into a newly created project.

    • If the order is correct, you can eliminate the data integrity error message by clicking the 'Confirm' button in the 'Safety Information' tab of the affected POU.

      The data integrity error message is deleted and the project can be built again.

Further Info
See topic "POU", section "Execution order of code worksheets in a POU" for details.