Sofar Solar 110 KTL - sterowanie ActiveOutputLimit przez Modbus i PLC, błąd timeout

I am trying to control ActiveOutputLimit of the Sofar Solar 110 KTL grid-tied inverter through Modbus. I am using function code 6 to update activeOutputLimit to change the active power. Every time it shows a timeout error.
while reading Modbus registers is ok but writing is not working.

Does anyone have such a kind of experience and solution?

Did you mean about writing to 0x1040 address?
Can you show your all frame what you send to inverter?

I want to write the active power output limit in % on the 0x901 (2305 decimal) register.

I will share the frame I'm sending to the inverter.

Sofar Solar has very confusing modbus description:
This is what I found:

So in my protocol description register address for real time power control is 0x9000 as in attached picture.
Im not sure that is should be enabled first in 0x1040 (FC:13) - take a look another picture. And finally another power control setings using FC:1 and 0x88 device ID with 0x0141 register - 3rd attached picture.