Application planning
5.2 System and load power supply
Automation system
System Manual, 01/2023, A5E03461182-AK
111
5.2 System and load power supply
Types of power supplies
The S7-1500 automation system/ET 200MP distributed I/O system distinguishes between two
types of power supply:
• System power supply (PS)
• Load current supply (PM)
System power supply (PS)
The system power supply has a connection to the backplane bus (U connector) and supplies
solely the internally required system voltage. This system voltage supplies parts of the
module electronics and the LEDs. A system power supply can also supply CPUs or interface
modules if these are not connected to a 24 VDC load current supply.
Load current supply (PM)
The load current supply feeds the input/output circuits of the modules, as well as the sensors
and actuators of the plant, if installed. If you supply the voltage for the backplane bus via a
system power supply, then the supply of the CPU/interface module with 24 V DC is optional.
Special characteristic of the load current supply
Load current supplies are mounted on the "S7-1500 mounting rail" and do not have a
connection to the backplane bus.
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