Hi,
When the PROFIBUS standard EN50170 was revised to include expanded communication functionality for PROFIBUS DP devices, the function expansions were known as DPV1 expansions.
If you want to know more details I can recommend the book:
Decentralization with PROFIBUS DP/DPV1
Weigmann & Kilian (published by Siemens)
ISBN 3-89578-218-1
Here is a scanned excerpt from it summarizing the interrupt and acyclic data traffic capabilities of DP standard, S7-DP & DPV1 slaves.