System overview
4.9 Power supply
Automation system
System Manual, 01/2023, A5E03461182-AK
97
4.9 Power supply
The power supply of an automation system to be dimensioned according to plant size. The
SIMATIC S7-1500 CPUs are supplied via a load power supply or a system power supply. A
system power supply that supplies the backplane bus is integrated in the CPUs. Depending on
the system configuration, you can expand the integrated system power supply with up to two
additional system power supply modules. If your plant has high power requirements, e.g. I/O
load groups, you can connect additional load power supplies.
The table below shows the main differences between the two power supplies for the SIMATIC
S7-1500 automation system:
Supplies 24 V DC to the S7-1500 system components such as CPU, system power
supply (PS), input/output circuits of the I/O modules and any sensors and actuators.
You can install the load power supply directly to the left of the CPU (without connec-
tion to the backplane bus).
If you supply the voltage for the backplane bus via a system power supply, then the
supply of the CPU or the interface module with DC 24 V is optional.
Supplies only internally required system voltage.
Supplies parts of the module electronics and the LEDs.
Additionally the PS 60W 24/48/60V DC HF keeps the complete work memory of the
Configuration example of a system with load power supply and system power supply
The following figure shows a system configuration with load power supply and additional
system power supply.
Figure 4-23 Overall configuration of power supply
In order to ensure the supply of the modules from the backplane bus, the incoming power is
compared with the required power in the TIA Portal engineering system or in the TIA
Selection Tool.
As early as in the planning stages, make sure that the power fed into the backplane bus is
always greater than or equivalent to the power drawn.
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