Hello, 

I'm facing a problem and I'm asking for help:  

I am communicating an S7-1200 with a G120C V4.6 drive via 
RS485 modbus communication. I am able to read the data, 
but I can not type the control word and setpoint in it. 
The RDY LED stays green all the time, but the BF led 
flashes slowly and the inverter does not start. 
The commissioning was carried out and it finished correctly.  

Can someone help me solve this problem?