S7Online connection for the PG/PC interface

Dear tech support and others,

I have problem with establishing communication between PG/PC  and  Sinamics S120 drives  using S7Online interface with  Ethernet to PROFIBUS stations  via S7 routing .

Please take a look to picture of  HW configuration in attachement.

PG/PC connection via S7Online access point  in STARTER to Siemens Sinamics DCM and S120 drives that are connected to -IF1: IF 964-DP PROFIBUS(3): DP11 is working without problem, connection to same type of drives that are connected to lines -X2: DP PROFIBUS(1):DP12(2) and   -X2: DP PROFIBUS(3):DP15(4) is not possible.

I have double checked settings in STARTER for each drive that all PROFIBUS addresses, S7 Subnet ID and PLC IP address are entered correctly.

All drives have same configuration for online access, respectively to their addresses, as you can see on picture in attachment. 

Commissioning interface in STARTER is configured as on picture in attachment.

Please note that all drives are commissioned locally and communication with PLC is working without any problem.

Does it mean that there is some problem to use PG/PC  S7Online access to drives that are connected to PROFIBUS line connected on port –X2: DP? Is it known problem and what could be reason/solution?

Version of STARTER installed on PG/PC is V4.4.0.3.

Version overview of drive components you can see on picture in attachment.