Siemens SIMATIC NET PROFIBUS User Manual download pdf (Page 2)

2

PROFIBUS topologies

Optical network

The fiber-optic cable version

of PROFIBUS has the following

properties:

· Resistance to electromagnetic

interference

· Suitable for wide ranges

· Galvanic isolation

· Either plastic, PCF or glass fiber-optic

conductors can be implemented

Optical networking with OLM

An optical network can be implemented

in a bus, star or hot standby ring topology

using Optical Link Modules (OLMs

®

).

Because the OLM can be used univer-

sally, it is the solution to practically

every automation task.

The maximum distance between two

OLMs can be up to 15 km.

The transmission rate can be adjusted

in steps from 9.6 kbit/s to 12 Mbit/s.

Optical networking

with integrated interfaces

and OBT

Optical networking with integrated

interfaces and OBT

®

is configured in a

bus topology.

A cost-optimized solution in the form

of devices with integrated optical inter-

faces is available for this.

Data terminals with RS 485 interfaces

or existing RS 485 segments can be

connected via an Optical Bus Terminal

(OBT).

The maximum distance between two

stations is 50 m with plastic fiber-optic

cables.

Special fiber-optic cables (PCF =

Polymer Cladded Fiber) are provided

for covering distances up to 300 m.

Figure 1: Typical configuration for optical PROFIBUS with OLM

Figure 2: Network configuration optical lines

Figure 3: Cost/performance ratio

OLM OLM

OP 17

S7-300

OLM OLM

ET 200S

S7-400

Drive

Glass FO cable

Bus cable

for PROFIBUS

PG/PC/OP

SIMATIC S7-400

with IM 467 FO

ET 200X

with integrated

optics

ET 200M

with integrated

optics

DP user

without integrated

optics

OBT

OBT

FO

RS 485

Additional

users

COSTS

PERFORMANCE

Integrated

interface

and OBT

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