Siemens S7-300 - Wiring the Power Supply Module and the CPU

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
7-7
1. Open the front panels of the power supply module and CPU.
2. Remove the strain relief clamp from the power supply module.
3. Strip the power cable to a length of approximately 11 mm and connect it to L1,
N, and to the ground conductor terminal of the power supply module.
4. Screw-tighten the strain relief clamp again.
5. You can now wire your CPU:
– With &38,)0, the power supply terminal connection is located on the
front panel of the integrated I/O.
Connect the lower terminal M of the power supply module to terminal M of
the CPU and the lower terminal L+ of the power supply module to terminal
L+ of the CPU.
– &38,)0'3'3'3 Insert the
connection comb and screw-tighten it.
6. Close the front panel.
The figure below illustrates the procedures described above.
230 V/120 V
1
1
2
Figure 7-3 Wiring the power supply module and the CPU
Table 7-5 Wiring accessories
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 Cable grip of the power supply
 Connection comb (accessory for power supply)
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The PS 307 power supply module is equipped with two additional DC 24 V
connections (L+ and M) for the supply of I/O modules.