User´s Guide Power Rail Booster Version 12/2005
Copyright © Siemens AG 2005 All rights reserved. 6ES7 972-4AA02-0XA0 Page 12 of 49
3.2.3 LED Test on activating the Voltage Supply
When you power up, the PRB activates the LEDs on the front for approximately 1
second.
3.2.4 Signal Regeneration
The PRB regenerates the signal waveshape of the data received, making it possible
to cascade as many as 10 PRBs. The signal throughput time is max. 6 tbit per PRB.
3.2.5 Short Circuit Detection
The Power Rail interface on the PRB is monitored for short circuits. If a short circuit is
detected, the transmitter components are shut down. When the problem has been
rectified, they are automatically put back into operation as described in Chapter
3.1
„Basic Function“. Critical states are signalled as described in Chapter
7 „LED display
and troubleshooting“.
3.2.6 Monitoring of the Output Temperature
The output element is protected against overload by a temperature monitor. The
monitor shuts the output element down when a critical temperature is exceeded.
When the output has cooled down, the PRB automatically restarts data transmission.
Critical states are signalled as described in Chapter
7 „LED Display and
Troubleshooting“.
3.2.7 Commissioning Aids
At least one active station is required to test the Power Rail connection during
installation. That station is usually the PROFIBUS master on the stationary side of
the Power Rail. This station serves as message source. On power-up, the Power Rail
Boosters are passive. They recognize the transmission speed based on the
messages sent by the station. The diagnostic LEDs on the front of the Power Rail
Booster provide a visual aid.
3.3 Settable Additional Functions (product Release 3 and above)
You can activate various additional functions using the DIP switch.
3.3.1 Display of the Firmware Version
Users can activate display of the firmware version on the PRB using DIP switch "DIP-
4".
• DIP-4 Æ „OFF“: displaying the firmware version is deactivated
• DIP-4 Æ „ON“: displaying the firmware version is activated
When display of the firmware version is activated, the LEDs have the following
meanings:
• LED „
ϑ“ = “ON” corresponds to 2
0
• LED „PR“ = “ON” corresponds to 2
1
• LED „DP“ = „ON“ corresponds to 2
2
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