Use Of A System Power Supply - Siemens Simatic S7-1500R System Manual

Application planning

3.7 Use of a system power supply

3.7 Use of a system power supply
Infeed options
There are three options for the infeed of the required system voltage in the backplane bus:
● Infeed via the CPU
● Infeed via the CPU and system power supply
● Infeed only via system power supply in slot 0
Infeed via the CPU
Supply the CPU with the permissible supply voltage 24 V DC.
Procedure
Proceed as follows to set up the supply via the CPU:
1. In STEP 7, open the "Properties" tab for the R/H-CPU. Select "System power supply" in
the navigation.
2. Select the option "Connection to supply voltage L+".
Figure 3-22
Infeed via CPU and system power supply
Supply the system power supply with the permissible supply voltage and the CPU with
24 V DC.
Both the system power supply and the CPU supply current to the backplane bus. The
supplied power is summed.
Power addition: Infeed power of the system power supply + infeed power of the CPU
90
Supply voltage via CPU only
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA