User´s Guide Power Rail Booster
Version 12/2005
Copyright
©
Siemens AG 2005 All rights reserved.
6ES7 972-4AA02-0XA0
Page 15 of 49
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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