Propagation Of Electromagnetic Interference - Siemens SIMATIC RF600 System Manual

4.6.4

Propagation of electromagnetic interference

Three components have to be present for interference to occur in a system:
• Interference source
• Coupling path
• Interference sink
Figure 4-5
If one of the components is missing, e.g. the coupling path between the interference source
and the interference sink, the interference sink is unaffected, even if the interference source
is transmitting a high level of noise.
The EMC measures are applied to all three components, in order to prevent malfunctions
due to interference. When setting up a plant, the manufacturer must take all possible
measures in order to prevent the occurrence of interference sources:
• Only devices fulfilling limit class A of VDE 0871 may be used in a plant.
• Interference suppression measures must be introduced on all interference-emitting
• The design of the system must be such that mutual interference between individual
Information and tips for plant design are given in the following sections.
RF600
System Manual, 09/2005 Edition, J31069 D0171-U001-A0-7618,
Propagation of interference
devices. This includes all coils and windings.
components is precluded or kept as small as possible.
4.6 Guidelines for electromagnetic compatibility (EMC)
RF600 system planning
4-23