Siemens SIMATIC S7-1500 System Manual page 21

Product overview
2.2 Components
Components
4-pole connection plug
for supply voltage of
the CPU
Load current supply
(PM)
20
In the delivery condition of each CPU a 4-pole connection plug is
plugged on the CPU.
The system power supply (PS), central modules (CPU), input and
output circuits of the I/O modules are supplied with 24 VDC through
the load current supply (PM). A load current supply does not occupy a
slot in the configuration and is not included in the system diagnostics.
If you are using load current supplies, we recommend the devices
from our SIMATIC series. These devices can be mounted on the
mounting rail.
The load current supply can be configured using STEP 7.
Load current supplies are available in various models:
PM 70W 120/230V AC
•
PM 190W 120/230V AC
•
Function Diagram
S7-1500 Automation System
System Manual, 02/2014, A5E03461182-AB