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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-11
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• When mounting on varnished or anodized metal parts, use special contact
washers or remove the insulating layers.
• Provide a large-surface and low-impedance metal-to-metal connection for
fastening the shielding/protective protective ground bar.
• Always touch-protect live mains conductors.
The figure below shows an example of EMC compatible wall-mounting of an S7.
CPU
PS
Figure 12-3 Example of EMC compatible wall-mounting
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