Cabling Components required Specification
The entire cabling is routed with‐
in a building
No cable junction is required be‐
tween the indoor and outdoor
area
The necessary cable length is
available in one piece. There is
no need to connect several cable
segments by means of distribu‐
tion boxes.
Convenient and complete instal‐
lation using patch cables
if necessary, installation
cables also for the inte‐
rior area
1 cable with 4 cores per fault-tolerant sys‐
tem
Both interfaces in one cable
1 or 2 cables with several shared cores
Separate installation of the interfaces in
order to increase availability (reduction of
common cause factor)
Connector type ST or SC, for example, to
match other components; see below
Further specifications you may need to
observe for your plant:
UL approval
Halogen-free materials
Avoid splicing cables in the field. Use pre‐
fabricated cables with pulling protection/
aids in whiplash or breakout design, in‐
cluding measuring log.
Patch cable for indoor
applications
Connector type LC on ST or SC, for ex‐
ample, to match other components
Installation via distribution boxes One distribution/junc‐
tion box per branch
Installation and patch
cables are connected
via the distribution box.
Either ST or SC plug-in
connections can be
used, for example.
Check the cross-over in‐
stallation when you wire
the CPUs.
Connector type ST or SC, for example, to
match other components
Assembling
5.2 Selecting fiber-optic cables
Synchronization modules for S7-400H
18 Equipment Manual, 04/2020, A5E50072434-AA
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