Specifications

PROFIBUS

System Overview

Topologies

2/77

Siemens LV 1 · 2007

Optical network

The optical conductor variant of PROFIBUS has the following

features:

• Transmission path is insensitive to electromagnetic interfer-

ence

• Suitable for long ranges

• Electrical isolation

• Uses either plastic or PCF or glass optical conductors

Optical PROFIBUS with OLMs

Using optical link modules (OLMs) it is possible to configure an

optical network as a line, ring or star structure. The maximum

distance between two OLMs can be 15 km. The transmission

rate is adjustable in steps from 9.6 kbit/s to 12 Mbit/s.

Optical PROFIBUS with integrated interface and OBT

The optical PROFIBUS with integrated interface and OBT is con-

figured as a line structure. A cost-optimized solution in the form

of devices with an integrated optical interface is available for this

purpose. Terminal equipment with an RS 485 interface can be

connected through an optical bus terminal (OBT). The maximum

distance between two stations on a plastic optical conductor is

50 m. Special optical conductors are used to span distances of

up to 300 m.

Network configuration of the optical PROFIBUS with OLMs

G_IK10_XX_50136

S7-300

with CP 342-5

ET 200pro

S7-400

with CP 443-5

Drive

OLM OLM OLM OLMOLM

with CP 5613 A2

Bus cable

for PROFIBUS

Glass FO cable