5 special cables – Siemens SIMATIC NET PROFIBUS User Manual

Page 220

Passive Components for Electrical Networks

7-24

PROFIBUS Networks SIMATIC NET

6GK1970-5CA20-0AA1 Release 2 05/2000

7.3.5

Special Cables

In addition to the SIMATIC NET standard fiber-optic cables described in the
Catalog IK 10, numerous special cables and accessories are also available. Listing
all the versions available is beyond the scope of the catalog and of this manual.

The technical specifications of the SIMATIC NET bus components indicate which
SIMATIC NET fiber-optic cable is the normal connecting cable and which other
fiber types are suitable.

Note

Remember that the distances that can be covered differ if you use fibers with other
core diameters or attenuation characteristics than those listed in the operating
instructions.

Fiber Types

In addition to the standard SIMATIC NET fiber types, the following fiber types are
often used:

m Fiber

This fiber is used particularly in Europe in Telecom applications instead of the
62.5

m fiber. The smaller core diameter means that less power can be coupled

into the fiber and reduces the distance that can be covered.

m Fiber

This single-mode fiber is used for transmission over extremely long distances.
The use of this single-mode fiber requires special, high-quality transmitter and
receiver elements and connectors. In conjunction with OLM/G11-1300 or
OLM/G12-1300, distances up to 15 km can be spanned.

Cable Structures

For special applications, numerous variations in the cable structure are available,
for example:

Bundled cords (cables with hollow cords capable of accommodating several
fibers)

Cables with rodent protection for underground installation

Halogen-free cables, for example for use in underground train systems

Hybrid cable with fibers and copper conductors in one jacket

Certified cables, for example for use on ships