Hi All, I am able to use my drive monitor over Profibus for monitoring and downloading Master Drive parameters, it is routed through my S7 400 CPU TCP/IP ---> Profibus. I have also been able to connect serially set parameters 443 and 554 to accept commands and operation to the Drive from the PC to operate the drive. I am not sure however when we are on Profibus most probably Scom is not probably valid. What is needed to operate the drive from the PC on Profibus. The ON OFF button and the window for the set point are greyed out.