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PROFIBUS Optional Board Operating instructions
36
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The following EMC-related precautions must be taken to ensure interference-free
PROFIBUS-DP operation, particularly in RS-485 data exchange mode:
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The screen of the PROFIBUS cable must be contacted in the bus connector.
Additional screening is provided via a screen clamp on the bus cable screen which
must make 360° contact with the protective earth. The solid copper core must not
be scored when the insulation is removed from the core ends. It must also be
ensured that the screen of each bus cable is connected to protective earth at both
the cabinet entry point and in the converter housing.
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The bus cables must be internally twisted and screened, and installed separately
from power cables (minimum distance 20 cm). The braided screen and underlying
laminated foil screen (if applicable) must be contacted in a 360°, positive
connection at both ends, i.e. the screen on the bus cable between two converters
must be connected to the converter housing at both ends. The same applies to the
screen of the bus cable between the PROFIBUS-DP master and converter.
Crossovers between bus and power cables must be laid at an angle of 90°.
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Differences in potential (e.g. due to different mains supplies) between the
converters and the PROFIBUS-DP master must be avoided.
½
Recommended equipotential bonding cables:
♦
16
mm
2
Cu for equipotential bonding cables up to 200 m long
♦
25
mm
2
Cu for equipotential bonding cables of over 200 m long
½
Equipotential bonding cables must be routed as close as possible to signal
leads, i.e. that the area between the bonding conductor and signal lead is as
small as possible.
½
Equipotential bonding cables must be contacted in a 360° connection with the
earth electrode/PE conductor.
Summary of Contents for Micromaster Profibus
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