Wiring The Power Supply Module And The Cpu - Siemens SIMATIC S7-300 Hardware And Installation Manual

Wiring
6.4

Wiring the power supply module and the CPU

Prerequisite
The modules are mounted on the profile rail.
Connecting comb (not for CPU 312 IFM and CPU 31xC)
You can connect some of the CPUs to the PS 307 power supply module using the
connection comb included with the module.
PS and CPU wiring
Note
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.
Note
On CPUs 31xC the power supply plug is removable.
Warning
Unintentional contact with live conductors is possible if the power supply module
and any additional load power supplies are switched on.
Always wire the S7-300 with the power turned off!
1. Open the front panel to the PS 307 power supply module and CPU.
2. Open the strain relief clamp on the PS 307.
3. Strip the power cable to a length of 11 mm and connect it to L1, N and to the
ground conductor terminal of the PS 307.
4. Screw-tighten the strain relief clamp again.
5. You have two options of wiring the CPU, depending on which one you are
using:
CPU 312 IFM and CPUs 31xC: Strip the connecting leads for the CPU
–
power supply to a length of 11 mm.
Connect the lower terminals M and L+ of PS 307 to terminals M and L+ of
the CPU.
CPU 313/314/314 IFM/315/315-2 DP/316-2 DP/318-2 DP: Insert the
–
connection comb and screw-tighten it.
6. Close the front panel.
The figure below illustrates the procedures described above.
6-6
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01