[quote user="sotima"]I'm a student of University of Brescia and I have to domust make one thesis on profinet irt.Do youknow where I can find of the technical documentation on protocol PROFINET and especially on operation IRT?

Hello Sotima,

I have found some usefull items for you (I hope);

PROFINET IO UK Presentation at Coombe Abbey

(I found where it starts to be interesting for you, that the pdf haves a error, I also give a feedback to Siemens to repair that).

In the next manual, the differences are shown between Profibus and Profinet.

PROFINET IO From PROFIBUS DP to PROFINET IO

The next pdf describes the ERTEC200, the ASIC which might be used for PROFINET IRT, this ERTEC200 is built in in the ET 200S PN IO.

ERTEC 200 Enhanced Real-Time Ethernet Controller

Development Kit - ERTEC 200 PN IO

And the ERTEC 400 which is built in in switches and in CPUs/Drives.

ERTEC 400 Enhanced Real-Time Ethernet Controller

And also a total description of PROFINET with also the IRT mode.

PROFINET System Descriptionwhere on page 12 of 116 more sources for your question are to find.

I hope that you have enough information, when not please contact me with a private message.