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User´s Guide Power Rail Booster
3 General Functions
3.1 Basic Function
The basic functionality of the Power Rail Booster is safe, reliable, bidirectional data
transmission. Following power-up, the PRB begins an automatic search for the baud
rate. Data transmission is activated as soon as a valid baud rate is found. If the
master then sends a request to its slave, data coming in over the RS485 interface
are received by the stationary PRB, elevated to a noise-free level, and sent to the
moving PRB on the power rail side, which receives the data, converts them to the
RS485 level and sends them to the slave. The slave's response to the master is
transferred the same manner, but in reverse order.
3.2 Functions
These are the functions which are permanently executed or supported by the Power
Rail Booster.
3.2.1
Supported Protocols
The PRB is designed for use as a network component in electrical PROFIBUS
networks. It is a pure transformer, and is largely transparent as PROFIBUS device. It
has no PROFIBUS address. Messages are checked for syntax, but the data are not
checked for correctness as regards their content. The Power Rail Booster supports
mono- and multi-master systems. PROFIBUS DP/FMS, as well as FDL and MPI, are
transferred as protocols.
Warning
U
If there are active stations on both sides of the power rail section,
all stations are at risk of a brief failure in the wake of line
interruptions.
3.2.2
Transmission Speed
The Power Rail Booster supports the following EN 50170-compliant transmission
speeds (baud rates):
9,6 kBit/s, 19,2 kBit/s, 45,45 kBit/s, 93,75 kBit/s, 187,5 kBit/s and 500 kBit/s
The transmission speed is set automatically as soon as the Power Rail Booster
receives valid messages over an interface. If the transmission speed is not yet
known, the outputs for all interfaces are disabled. The PRBs recognize any changes
in the transmission speed during operation and reconfigure themselves accordingly.
Brief transmission problems may occur at the moment of switch-over.
Copyright © Siemens AG 2005 All rights reserved.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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Version 12/2005
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