![SEW-Eurodrive MOVIDRIVE MOVI-PLC DHP11B Manual Download Page 17](http://html.mh-extra.com/html/sew-eurodrive/movidrive-movi-plc-dhp11b/movidrive-movi-plc-dhp11b_manual_1250110017.webp)
Manual – MOVIDRIVE® MDX61B MOVI-PLC® DHP11B Control Card
17
3
Connecting PROFIBUS (connector X30)
Assembly / Installation Instructions
Shielding and
routing bus
cables
The PROFIBUS interface supports RS485 transmission technology and requires the
cable type A to IEC 61158 specified as the physical medium for PROFIBUS. This cable
must be a shielded, twisted-pair cable.
Correct shielding of the bus cable attenuates electrical interference that may occur in
industrial environments. The following measures ensure the best possible shielding:
•
Tighten the mounting screws on the connectors, modules and equipotential bonding
conductors by hand.
•
Only use connectors with a metal housing or a metallized housing.
•
Connect the shielding in the connector with the greatest possible surface area.
•
Attach the shielding of the bus line on both sides.
•
Do not route signal and bus cables parallel to power cables (motor leads). They must
be routed in separate cable ducts.
•
Use metallic, grounded cable racks in industrial environments.
•
Route the signal cable and the corresponding equipotential bonding in close proxim-
ity using the shortest way possible.
•
Avoid using plug connectors to extend bus cables.
•
Route the bus cables closely along existing grounding surfaces.
Bus termination
The DHP11B control card is not provided with bus terminating resistors. This enables
the PROFIBUS system to be put into operation more easily and reduces the number of
error sources during installation.
When the DHP11B control card is located at the start or end of a PROFIBUS segment
and when there is only one PROFIBUS cable connected to the DHP11B control card,
you must use a plug with an integrated bus terminating resistor.
Switch on the bus terminating resistors for this PROFIBUS plug.
In case of fluctuations in the earth 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 to relevant VDE regulations
in such a case.