Freelance - not working profibus CI801
I must ask what do You mean by "without making any changes in configuration". If You set up communikation for CI801 EXACLY the same as for CI830, You used wrong gds/dtm file... This can result in "Parameter error on slave" massage. In this case You must define the connection again, from the start, using proper gds/dtm file.
If that's not it - please describe the state of LEDs on CI801 and PROFIBUS Master.