Shielding Precautions - Omron CJ Series Operation Manual

2 Nomenclature and Installation
2-3-4

Shielding Precautions

 Bus Cable Connector
2-12
To ensure electro-magnetic compatibility (EMC), the shield of the cable
should be connected to the metal case of the plug connector.
If the Unit is installed in a control cabinet, 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 CPU and the control panel 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:
• Test run of PROFIBUS equipment.
• 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.
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)