Siemens SIMATIC RF300 - Page 69

RF300 system planning
4.6 EMC Directives
SIMATIC RF300
System Manual, Release 04/2006, J31069 D0166-U001-A2-7618
4-49
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:
,
1
7
(
5
)
(
5
(
1
&
(
6
,
1
.
,
1
7
(
5
)
(
5
(
1
&
(
6
2
8
5
&
(
*DOYDQLFFRXSOLQJSDWK
&DSDFLWLYHFRXSOLQJSDWK
,QGXFWLYHFRXSOLQJSDWK
5DGLDWLRQFRXSOLQJ
5),'
$60RU
UHDGHU
ZULWHU
5),'
$60RU
UHDGHU
ZULWHU
5),'
$60RU
UHDGHU
ZULWHU
5),'
$60RU
UHDGHU
ZULWHU
Figure 4-22 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 4-10 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