Siemens SIMATIC RF660 System Manual page 37

Shielding by enclosure
• Protect the device against external interference by installing it in a cabinet or housing.
• Use metal plates to shield the device against electromagnetic fields.
• Use metal connector housings to shield data conductors.
Wide-area ground connection
• Bond all passive metal parts to chassis ground, ensuring large-area and low-HF-
• Establish a large-area connection between the passive metal parts and the central
• Don't forget to include the shielding bus in the chassis ground system. That means the
• Aluminium parts are not suitable for ground connections.
Plan the cable installation
• Break the cabling down into cable groups and install these separately.
• Always route high-voltage and signal cables through separated ducts or in separate
• Feed the cabling into the cabinet from one side only and, if possible, on one level only.
• Route the signal cables as close as possible to chassis surfaces.
• Twist the feed and return conductors of separately installed cables.
• Cable routing of HF cables:
RF600
System Manual, 09/2005 Edition, J31069 D0171-U001-A0-7618,
The housing or enclosure must be connected to the chassis ground.
impedance contact.
grounding point.
actual shielding busbars must be connected to ground by large-area contact.
bundles.
Avoid installing cables in parallel over long distances and maintain minimum distances
between the cables (at least 25 cm)
4.6 Guidelines for electromagnetic compatibility (EMC)
RF600 system planning
4-21