Hope this helps,
Daniel Chartier

The first is an abstract from an article from IEEE, you will have to register to get the full document:

"At present, there are two options to develop Profibus-DP Slave. One option is to use private intelligent Profibus protocol communication chip to develop [1]. The other achieves it to use the software programming in microcontroller. But the above two options exist some defects. For example, the first option can't be applied in the self-development occasions because the program of ASIC can't be modified and also the ASIC is very expensive. The second option can't complete high transfer-rate due to be restricted by microcontroller of low operating frequency, but it costs less money on hardware. So, this article proposes a new proposal that the intelligent Profibus-DP slave will complete through software programming in the 32-bit STM32F103 embedded systems to resolve the shortcoming in the above options. In this paper, it first analyzes the feasibility of high-speed transmission using STM32F103 chip."

http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6007805

Also:

Profibus Competence Centers (look fo the country nearest your location):

"PICCs offer technical support to anyone who needs it and they play an essential role in supporting first-time developers of PROFIBUS and PROFINET devices and systems. PICCs often support local RPAs in the delivery of technical seminars and workshops."

http://www.profibus.com/nc/community/competence-centers/#picc_AUSTRALIA

Development kit- Profibus slave:

https://www.sea.siemens.com/us/PIC/Development/PROFIBUS/Pages/DevelopmentKits.aspx?HTTPS=REDIR

Profinet and Profibus development kits:

http://us.profibus.com/docs/PROFIBUS_and_PROFINET_Dev_Kits.pdf