Siemens S5-155U System Manual page 34

System Manual
C79000-B8576-C199-03
Principles of Installation of Systems for EMC
Depending on the propagation medium (conducted or non-conducted
interference) and distance from the source, interference can be picked
up by the programmable controller via different coupling mechanisms.
A distinction is made between the following:
• • Direct coupling
• • Capacitive coupling
• • Inductive coupling
• • Radiated interference
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