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Manual – MOVIPRO® SDC with DeviceNet Interface
4
Shielding and routing the bus cables
Installation Notes
4.2
Shielding and routing the bus cables
The DeviceNet interface supports RS485 transmission technology and requires the
cable type A to EN 50170 specified as the physical medium for DeviceNet. This cable
must be a shielded, twisted-pair cable.
Correct shielding of the bus cable attenuates electrical interference that can occur in in-
dustrial environments. The following measures ensure the best possible shielding:
• Manually tighten the mounting screws on the connectors, modules, and equipotential
bonding conductors.
• Use only connectors with a metal housing or a metalized housing.
• Connect the shielding in the connector over a wide surface area.
• Apply the shielding of the bus cables on both ends.
• Route signal and bus cables in separate cable ducts. Do not route them parallel to
power cables (motor leads).
• Use metallic, grounded cable racks in industrial environments.
• Route the signal cable and the corresponding equipotential bonding close to each
other using the shortest possible route.
• Avoid using plug connectors to extend bus cables.
• Route the bus cables closely along existing grounding surfaces.
NOTICE
In case of fluctuations in the ground potential, a compensating current may flow via the
bilaterally connected shield that is also connected to the protective earth (PE). Make
sure you supply adequate equipotential bonding according in accordance with rele-
vant VDE regulations in such a case.