Application planning
4.2 System and load power supply
Automation system
System Manual, 12/2017, A5E03461182-AE
95
4.2
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. The supply of the CPU/interface module with 24 V DC
is optional if you supply the voltage for the backplane bus via a system power supply.
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.
Total configuration with power supplies
Figure 4-4
Total configuration with load current supply (PM) and system power supply (PS)
Optionally, you can insert up to two system power supplies (PS) in the slots to the right of the
CPU/interface module.
The number of load current supplies is unlimited.
Observe the installation rules and specified installation distances in the manuals of the load
current supplies.
Summary of Contents for Simatic S7-1500/ET 200MP
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