GE Industrial Solutions AF-650 GP PROFINET - Manual (Page 8)

3.1.2 Network
It is of high importance that the media chosen for Ethernet
data transmission are suitable. Usually CAT 5e and 6 cables
are recommended for industrial applications. Both types
are available as Unshielded Twisted Pair and Shielded
Twisted Pair. Generally shielded cables are recommended
for use in industrial environments and with frequency
converters.
A maximum cable-length of 100m is allowed between
switches.
Optical fibres can be used for gapping longer distances
and providing galvanic isolation.
For connecting PROFINET devices both hubs and switches
can be used. It is, however, recommended always to use
suitable industrial graded Ethernet switches. GE
recommends always to use PROFINET compliant switches
How to Install PROFINET Operating Instruction
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