The 2016 version includes technical corrections. Free PDFs often circulate older drafts (e.g., 2001 version) which lack current requirements for toe plates and handrail strength.
Understanding DIN EN ISO 14122-3: The Standard for Safe Machine Access din en iso 14122-3 pdf
Using standard step rise of 200 mm: 3000 mm / 200 mm = 15 steps. Number of risers = 15. Number of treads = 14 (one less for top floor landing). The 2016 version includes technical corrections