Profinet Error (PNIO0017): The Profinet device '...' needs a higher reduction ratio.
Increase the 'Reduction ratio' of the affected device in its 'Interface' settings.
To open this editor, double-click the error message. Alternatively, you can double-click the corresponding node in the PLANT.
Example:
For more information refer to the tooltips in the 'Settings' editor of the Interface by hovering the mouse pointer on the 
symbol.