Siemens SIMATIC NET PROFIBUS Owner's Manual page 233

Design
OLMs are available with one or two fiber-optic interfaces for different types of
fiber-optic cable:
S Plastic fiber-optic cable (980/1000 m) can be used for distances of up to 80 m.
They can be fitted with BFOC connectors on site.
S PCF fiber-optic cables (200/230 m) can be used for distances up to 400 m.
They are available preassembled with 4 BFOC connectors and a pulling loop.
S Glass-fiber multimode fiber-optic cable (62.5/125 m) such as the SIMATIC
NET fiber-optic cables can be used to span distances up to 3000 m. They must
be ordered preassembled with 4 BFOC connectors and are tested before they
are supplied.
S Monomode fiber-optic cables (10/125 m fibers) can be used for extremely long
distances of up to 15 km. These are available on request.
OLMs can be combined via an RS-485 interface and individual nodes or entire
electrical segments can be included in the PROFIBUS network.
The version 3 OLMs support all PROFIBUS transmission rates up to
12 Mbps.
They have a compact metal casing. They are suitable for installation on a DIN rail
or for fixed mounting. When installed vertically, OLMs can be placed side-by-side
needing gaps between them.
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Active Components for Optical Networks
8-5