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During an online change with Machine Expert Logic Builder, the following popup may appear, with the message: "The code changes may have unintended consequences: Please check the details before continuation!"
In the "Detailed Online Change Information" window, depending on which POUs you have modified, you may notice that some variables need to be reallocated. This could have serious consequences for the application, which is why the warning is displayed.
To avoid this, it is possible to assign a Memory Reserve to each individual FB in the project, especially to FBs that are under development, in order to prevent unexpected variable reallocations.
An Online Help page clarifies this topic:
Online Change Memory Reserve Settings
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