Hello,

I see clear info in first post about Master-Slave cfg so no Coupler is expected here. You can add more I/O slots with defined data types to not go over that 244 bytes probably. 

Hello polyzos;

To make the information requested clear:

Each slave node in a Profibus-DP master-slave configuration is able to exchange up to 244 bytes output data and 244 bytes input data with the Profibus master.

If you want to study this further, I suggest you follow the link in this thread to the Profibus International site manuals:

https://support.industry.siemens.com/forum/ca/en/posts/what-is-the-amount-of-data-exchanged-between-a-profibus-master-and-a-single-slave/244542

Hope this helps,

Daniel Chartier