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Setting up a PROFIBUS network
2-5-4
Section 2-5
Shielding Precautions
Cable Shield Connection
Inside cabinet
Ground Rail
To ensure electro-magnetic compatibility (EMC), the shield of the cable
should be connected to the metal case of the plug connector.
When entering the control cabinet in which the PRT1-SCU11 Unit is installed,
the bus cable shield should be brought into physical contact with a grounding
rail using a grounding clamp or similar device. The cable shield should continue in the cabinet right up to the PROFIBUS device.
Ensure that the Unit and the control cabinet in which it is mounted have the
same ground potential by providing a large-area metallic contact to ground,
e.g. galvanized steel to ensure a good electrical connection. Grounding rails
should not be attached to painted surfaces.
For further information regarding PROFIBUS network installation, please refer
to “Installation Guideline for PROFIBUS-DP/FMS” (PNO Order No. 2.112),
which is available at every regional PROFIBUS Organization. The information
covers:
• Commissioning of PROFIBUS equipment.
Outside cabinet
• Testing the PROFIBUS cable and bus connectors.
• Determining loop resistance.
• Testing for correct bus termination.
• Determining the segment length and cable route.
• Other test methods.
• Example of an equipment report in the PROFIBUS guideline.
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