User´s Guide Power Rail Booster Version 12/2005
Copyright © Siemens AG 2005 All rights reserved. 6ES7 972-4AA02-0XA0 Page 21 of 49
5.2 Configuration with the „PRB Checker“
The Table below provides an overview of the maximum permissible lengths of PRB
segments depending on the transmission speed.
Baud rate Maximal permissible length
9600 bit/s 1250 m
19200 bit/s 625 m
45450 bit/s 264 m
93750 bit/s 128 m
187500 bit/s 81 m
500000 bit/s 25 m
Fig. 11: Maximum rail length depending on the selected transmission speed
In addition to the transmission speed, other parameters such as total capacitance
and contact resistance must also be taken into account. The applications engineer
has at his/her disposal, free of cost, the “PRB Checker” software tool for easy, fast
and reliable calculation of the lengths of the individual PRB segments. This tool can
be obtained through Siemens Customer Support under the ID: 13884116 for
downloading over the Internet.
Installation is not necessary following downloading. All files must be copied into one
directory. After calling “PRB-Checker.exe”, you can select the relevant PRB from the
start screen based on Order No. and the language you wish to use.
Note: Before working with the program, you must set the language in Windows
Control Panel to German [Germany].
Fig. 12: The PRB Checker configuring tool – input screen form
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