As implemented at approximately 19th November, Schengen nationalities receive up to 90 days stay in the UAE in any 180 day period. The 90 days allowed does not have to be in one trip, however, these nationalities CANNOT stay longer than a total of 90 days and once 90 days is reached, they must stay out for 90 days.
For your own personal clarification, you can call GNRD on 800 5111 or go to Dubai Airport Terminal 3 where there is a GNRD office.
This Rule only applies to Schengen countries. It does not apply to Schengen nationals who are switching to an employment visa or switching from an employment visa.