Siemens SIMATIC Manual page 7

Layout of the example
For setting the line voltage
Power supply ON / OFF
Sample layout (certain details of the CPUs may differ from the above illustration)
Power supply (PS)
Strain relief
220V/ 120V
Wiring the power supply and CPU (front cover open)
S7-300 Automation System CPU 31x: Commissioning
A5E00164278-02
LEDs
Rail
PS
Programming device (PG)
with STEP 7 software
CPU
L+
M
L+
M
L+
L+
M
M
Connecting cables between the PS and CPU
MC/MMC Mode selector switch
CPU DI DO
PG cable for connecting
to the MPI interface
MPI interface for connecting to the PG
Removable power supply connection
5