User Documentation
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2.21.1 Routing Ethernet bre-optic cables
If the maximum permissible tractive forces are exceeded, the optical
bres can be overstretched if necessary. This can result in greater
attenuation, shorter service life and/or permanent damage to the
cable. Permanent or sporadic transfer faults may result. Such faults
may also arise later on, sometimes years after installation. Particular
attention should be paid to compliance with bending radii. The
minimum bending radius for Ethernet cable is usually at least 15
times the cable diameter. Please also take into account the data
provided by the manufacturer in the data sheets.
2.21.2 Protecting plug-in connectors from dirt
• Plug-in connectors for bre-optic cables are sensitive to dirt.
• Use the dust caps provided to protect plug-in connectors and sockets that are
not connected.
• Clean the front surface of a plug-in connector before plugging into devices
or optical couplings. Use a uff-free cloth soaked in isopropyl alcohol for this
purpose. Place the cloth on a surface which is level and not too hard. To clean,
pull the plug-in connector in one direction over the cloth. Repeat the process at
a slight offset if necessary. First clean when damp, then dry. Use a microscope
to check cleaning results.
(Source:PROFINETassemblyguideline,version1.0,January2009)