Introduction; Applications - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster

2 Introduction

The PRB (Power Rail Booster) is intended for use as a network component in
electrical PROFIBUS networks. Its purpose is the amplification and safe, reliable
transmission of PROFIBUS signals. The PRB enables the transmission of
PROFIBUS signals over contact rails, loops and other cable types (such as
telephone cables) not compliant with the PROFIBUS Specification. The PRB also
enables data transmission in the face of an excessive EMC load.
The PRB can be easily integrated in existing PROFIBUS fieldbus networks. It is also
possible to configure a complete PROFIBUS fieldbus network in line and/or star
topology. Except for the Power Booster itself, no other filters or terminating elements
are required for safe, reliable data transmission. In the case of increased EMC
loading above the limit values stated in the technical specifications, using
interference suppressor filters can allow you to achieve higher limit values.
Every PRB has two independent, isolated interfaces, each in turn consisting of a
transmitter component and a receiver component.
The primary channel is designated as 9-pin D subminiature (female) socket
connector. An RS 485 bus segment to PROFIBUS Standard EN 50170 can be
connected to this channel.
The secondary channel is run to a terminal strip. There are two pins for each signal
(A1, A2 and B1, B2). A power rail segment can be connected to this channel. The
nominal cross-sectional area measures 2,5mm².
LEDs signal the current status as well as any malfunctions.
The operating voltage supply comes from 24 V direct voltage.
At least two Power Rail Boosters are required for a transmission link.

2.1 Applications

Primary applications for the Power Rail Booster include:
Motor-driven overhead trolley conveyors,
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Storage/retrieval devices,
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- Crane installations,
Rotary feed through units and rotary tables,
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Lifts and hoisting apparatus,
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- Traversing tracks.
It is also generally recommended that the Power Rail Booster be used for cost-
efficient, safe and reliable PROFIBUS transmissions via contact rails or cables.
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6ES7 972-4AA02-0XA0
Version 12/2005
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