User Documentation
Installation
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109
In the standing areas of walk-in building and
machine parts and near transport routes, route the
Ethernet cable in metallic reinforced tubes or metallic
cableways.
Note
Given the maximum length of roughly 100 metres for Ethernet
copper cable, we would recommend using bre-optic cable for
connections between buildings for reasons of potential isolation
and for better protection from electromagnetic faults.
(Source:PROFINETassemblyguideline,version1.0,January2009)