Hello,
my devices are:

s7-1200
cb 1241 RS485 module
sinamics v20 inwerter

I want to give run command from DI1 but want to change frequency via Modbus RTU. I'm writing in SCL code and I'm using 3rd party HMI pannel therefore I can't use  sample application given my Siemens suport.

Parameters i used to program inverter:

CN11 ->1
P700 -> 2
P701 -> 1
P1000 -> 5
P2010(0) -> 7
P2014(0) -> 130
P2021 -> 1
P2023 -> 2

In Tia portal I'm using MB_CONFIG_LOAD and MB_MASTER blocks.

After that i was able to establish communication. Value of parameter P2000 was equal to what i was writing to register 40016 from PLC.
I was also able to start inveret from DI1.I was also able to send value of 9C4 to HSW (40101). Now when i was trying to write 47E to 40100 (STW1) i'm getting F72 error on inverter screen. I'm fighting with this issue for 2 days and tomorrow is my deadline.
I'm kindly asking for help.
Best regards
Dawid