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User´s Guide Power Rail Booster Version 12/2005

4.2 Introduction

The following network topologies can be implemented using the Power Rail Booster:

- Cascading of Power Rail sections,

- Point-to-point connections

- Line topology

- Star topology (contact rail system)

- Closed loop

Combinations of the above are also possible. Two contact rails or cable strands are

used to set up the Power-Rail sections for these network topologies. All cabling or

wiring for the contact rails must be done with PROFIBUS cable.

4.3 Examples of Topologies

4.3.1 Cascading

The PRB regenerates the signal waveshape of the data received, making it possible

to cascade as many as 10 PRBs. You must consider the increased signal throughput

time (6 T-bits per PRB) when configuring in STEP 7, see Chapter

5.3.1!

Fig. 4: Example of cascading

4.3.2 Point-to-point Connection

This configuration is distinguished by the fact that only one PRB is installed on each

side of the Power Rail section. To optimize interference immunity, users must set the

"IS-Master" signal on both PRBs. To do this, you must set on both PRBs DIP

switches DIP-7 and DIP-8 to "ON".

Fig. 5: Example of a point-to-point connection

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Siemens 6ES7 972-4AA02-0XA0 User Manual

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