Specifications

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PROFIBUS

System Overview

Topologies

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Siemens LV 1 · 2007

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Overview

Siemens offers an extensive range of PROFIBUS network

components for electrical and optical transmission technology.

PROFIBUS is standardized according to IEC 61158/EN 50170

for universal automation (PROFIBUS FMS and PROFIBUS DP)

and to IEC 61158-2 for process automation (PROFIBUS PA).

Electrical network

• The electrical network uses a shielded, twisted two-wire cable.

The RS 485 interface works with voltage differences. It is less

sensitive therefore to interference than a voltage or current in-

terface. With PROFIBUS the stations are connected by means

of a bus terminal or a bus connector (max. 32 stations per

segment).

• The individual segments are connected through repeaters.

• The transmission rate is adjustable in steps from 9.6 kbit/s to

12 Mbit/s.

• The maximum segment length is dependent on the transmis-

sion rate.

• The electrical network can be configured as a bus or tree

structure.

• The transmission technology according to IEC 61158-2 is

used with PROFIBUS PA for applications in the inherently safe

area. In this case the transmission rate equals 31.25 kbit/s.

Features

• High-quality bus cable

• Transmission method: RS 485 (according to EIA)

• Bus structure with bus terminals and bus connector for con-

necting the PROFIBUS stations

• Transmission method according to IEC 61158/EN 50170 for

universal automation (PROFIBUS FMS/DP) and according to

IEC 61158-2 for the inherently safe area (PROFIBUS PA)

• Conversion of DP transmission from RS 485 (bit coding

through voltage difference signals) to IEC 61158-2 (bit coding

through current signals) takes place through the network com-

ponents (DP/PA coupler or DP/PA link)

• Simple, consistent mounting and grounding concept

• Easy installation

Network configuration as electrical PROFIBUS network

G_IK10_XX50012

PROFIBUS PA

PC with CP 5613 A2

S7-400 with CP 443-5

ET 200S

Drive

OP 17

ET 200M

DP/PA-Link

Repeater

Intrinsically-safe area

Repeater

ET 200pro ET 200pro