Siemens SIMATIC S7-1500 System Manual page 40

Configuration variants
Figure 4-3
Reference
Information about the required cables is available in the section Power balance calculation
(Page 43).
Further information on the performance values (power feed, power consumption) of the
CPU, of the system power supply, and of the I/O modules can be found in the Manuals
(http://support.automation.siemens.com/WW/view/en/57251228) of the respective modules.
S7-1500 Automation System
System Manual, 02/2014, A5E03461182-AB
Configuration variants with 3 power segments
Application planning
4.2 System and load power supply
39