Siemens S7-300 - Example: S7-300 with Load Power Supply from PS 307

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
5-31
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The figure below shows the overall S7-300 configuration (load power supply unit
and grounding concept), with TN-S mains supply.
Apart from powering the CPU, the PS 307 also supplies the load current for the
24 VDC modules.
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The arrangement of supply connections displayed does not correspond with the
physical arrangement; it was merely selected to give you a clear overview.
N
M
L1
M
PS
S7-300 CPU
µP
L1
L2
L3
N
PE
SM
Rail
Low-voltage distribution
e. g. TN-S system (3 x 400 V)
Ground bus in cabinet
DC 24 V load circuit for DC modules
L+
Signal modules
Cabinet
Figure 5-13 Example: S7-300 with load power supply from PS 307