Siemens Simatic S7-1500R System Manual page 130

Open installation, wall breakthroughs, cable ducts
Note the following points when laying fiber-optic cables:
● Fiber-optic cables can be installed in open locations provided you can safely exclude any
damage in those areas (vertical risers, connecting shafts, telecommunications
switchboard rooms, etc.).
● Attach fiber-optic cables to mounting rails, for example cable trays or wire mesh ducts,
using cable ties. Take care not to crush the cables when fastening them. Make sure there
is not too much pressure on the fiber-optic cables.
● Before laying the fiber-optic cables: Deburr the edges of the holes. Round the holes. This
prevents damage to the sheathing when you pull in and fasten the cable.
● The bending radius must not be smaller than the value specified by the manufacturer.
● The branching radii of the cable ducts must correspond to the specified bending radius for
the fiber-optic cable.
● Lay the redundancy connections so that the fiber-optic cables are securely protected from
damage.
● Always lay the two redundancy connections separately. Laying the connections
separately increases availability and protects against undefined system states. An
undefined system state occurs when the two redundancy connections are interrupted
simultaneously in a time period of ≤ 1500 ms.
Pressure
Do not exert any pressure on the cable, for example by the inappropriate use of clamps
(cable quick-mount) or cable ties.
Do not step on the fiber-optic cable.
Heat
The cables are sensitive to direct heat. Hot air guns and gas burners as used in heat-shrink
tubing must not be used on the fiber-optic cables.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
5.9 Connecting interfaces for communication with S7-1500H
Wiring
129