Creating a gsd file for PROFIBUS

Hello:
I´m trying to create a gsd file to adevice we´ve designed, and i´m
having some problems with the module definition. I have defined a
module called "Tarjeta" as it follows:

Module="Tarjeta"
0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11
2
EndModule

I need this module to be able to read 16 word data. It works right
when there´s only one module inserted. The problem starts when i
insert more than one module in the same one DP slave to read 32 word
data: i´ve seen the message between master and slave and data are
transmited, but the master seems not to assign any offset addressing
to the second one, so it´s enable to read them, i don´t know why.
Is there anything wrong with the module definition in the gsd file or
is it a problem of the master configuration? i would like to know also
if there´s any place where i could download a manual for creating gsd
files,i haven´t found anything free on the web.
Thanks,
Beatriz.