Siemens CPU 313C Hardware And Installation Manual page 92

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The modules are mounted on the rail.
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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.
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The power supply connection of your CPU can be inserted and removed.
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You may come into contact with live wires if the power supply module and any
additional load power supply units are connected to the mains.
You should therefore disconnect the S7-300 from the power supply before starting
the wiring. Only use ferrules with insulating collars to press-fit onto the ends of the
cables. Once you have wired the modules, close all the front panels. You can then
switch on the S7-300 again.
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03