That’s possible as long as the cursor is active. If you use a label in a 2D-diagram you can automatically update the content (cursor position). Activate the option Update windows (Diagram Properties|Cursors). The Update windows specifies that the the window is to be refreshed after every cursor move. Select this option if you display data sets, which refer to the actual cursor positions, in the same window.
Example: Cursor position of the active cursor in the diagram ‘2DDiagram’
%{'2DDiagram.2D'.Cursor(fpCursorActive, 1).PositionIndex}
Example: Y-value of ‘Signal’ at the current cursor position
%{Signal['2DDiagram.2D'.Cursor(fpCursorActive, 1).PositionIndex]}
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