Commissioning 
  3.4 Configuring the drive components 
Connection of the SINAMICS S120 to the Technology CPU 
Product Information, 09/2011, A5E00480378-04 
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7.  For the process data communiction between the Technology CPU and the infeed, select 
the "SIEMENS message frame 370 for the infeed". Click "Next" to confirm the setting.