Siemens SINAMICS G120 CU250S-2 Series - Terminal blocks

Installing
3.3 Terminal blocks
CU250S-2 Control Units
10 Compact Operating Instructions, 05/2014, A5E32899990B AB
3.3
Terminal blocks
Terminal strips behind the upper front door
Different reference potentials:
The terminals labelled "GND" are connected internally.
"GND" and "GND IN" are not connected internally.
Figure 3-1 Interconnection example of the digital inputs with external 24 V power supply
Interconnecting the analog inputs (terminals 3, 4 and 10, 11)
For the analog inputs, you may use the internal 10 V supply (example: terminals 1 … 4, 13)
or an external supply (example: terminals 10, 11).
If you use the internal 10 V supply, you must connect AI 0- or AI 1- to GND.