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Commissioning
Note
Make sure that the PROFIBUS OBT is adequately grounded by connecting the DIN rail or
mounting plate to local ground with low resistance and inductance. When securing the module
to a mounting plate, run a cable from the grounding terminal of the OBT to the nearest possible
ground, keeping the cable as short as possible.
The shield of the PROFIBUS cable must be contacted. To do this, strip the insulation from the end
of the PROFIBUS cable and connect the shield to functional earth.
Note
Only use bus cables approved for PROFIBUS as the RS-485 bus cable.
Note
The OBT housing must not be opened.
Read the safety notices
Note the following safety notices. These relate to the entire working life of the device.
NOTICE
Improper mounting
Improper mounting may damage the device or impair its operation.
• Before mounting the device, always ensure that there is no visible damage to the device.
• Mount the device using suitable tools. Observe the information in the respective section
Suitable cables at high ambient temperatures in hazardous area
At an ambient temperature of ≥ 60 °C, use heat-resistant cables designed for an ambient
temperature at least 20 °C higher. The cable entries used on the enclosure must comply with
the IP degree of protection required by EN IEC / IEC 60079-0, GB 3836.1.
Unsuitable cables or connectors
Risk of explosion in hazardous areas
• Only use connectors that meet the requirements of the relevant type of protection.
• If necessary, tighten the connector screw connections, device fastening screws, grounding
• Close unused cable openings for electrical connections.
• Check the cables for a tight fit after installation.
22
about mounting.
WARNING
WARNING
screws, etc. according to the specified torques.
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 06/2022, C79000-G8976-C122-08
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