Siemens SINAMICS G120 Operating Instructions Manual page 167

Add an S7 300 subrack to your project by dragging and dropping it from the "SIMATIC 300"
hardware catalog. Connect a power supply to slot 1 of the subrack and a CPU 315-2 DP to
slot 2.
When you add the SIMATIC 300, a window is displayed in which you can define the network.
Create a PROFIBUS DP network.
Figure 5-26
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
Add a SIMATIC 300 station with the PROFIBUS DP network
5.11 Operation in fieldbus systems
Functions
167