How to get Profinet IO payload to .csv

Hello

What are the magic words with tshark (or some other way) to get Profinet IO log as csv format with IO payload?

I can transform the log to csv and I've tried all the display filter fields for pn_io http://www.wireshark.org/docs/dfref/p/pn_io.html and others, but I can't get the payload. Some field which seemed to contain payload (by field name) prints just word 'data'.

br, Esa