Siemens SIMATIC MOBY D - Page 74

Planning the MOBY D system
4.5 EMC Guidelines
MOBY D
74 System Manual, 01/2010, J31069-D0147-A6-7618
Coupling paths
A coupling path has to be present before the disturbance emitted by the interference source
can affect the system. There are four ways in which interference can be coupled in:
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Figure 4-23 Ways in which interference can be coupled in
When RFID modules are used, different components in the overall system can act as a
coupling path:
Table 4- 26 Causes of coupling paths
Coupling path Invoked by
Conductors and cables
 Incorrect or inappropriate installation
 Missing or incorrectly connected shield
 Inappropriate physical arrangement of cables
Control cabinet or housing
 Missing or incorrectly wired equalizing conductor
 Missing or incorrect earthing
 Inappropriate physical arrangement
 Components not mounted securely
 Unfavorable cabinet configuration