Siemens SINAMICS DCM Manual page 299

Commissioning
8.4 Commissioning with the STARTER commissioning tool
4. The PPI bus address for a drive unit with a CUD is fixed at 3, for an expansion CUD in
the right slot it is fixed at 5.
5. When creating the drive unit, also set the corresponding bus address.
Figure 8-34
300
Setting the bus address
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SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001