Chapter 6 - Connection to PROFIBUS
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PROFIBUS Tester BC-700-PB - User Manual
Topology scan
The topology scan determines the sequence and distances of all passive bus stations
(slaves). This feature requires correct bus cabling, a very good signal quality, and a
connection point located directly at the beginning or end of the bus.
Cable test
The cable test assesses the wiring and can be used to determine a faulty cable location
(e.g. short circuit) by means of reflection test.
All three features can only be used during shutdown of the installation. The D-sub cable
BC-600-PB-CB-DSUB-2 which is included in the standard scope of supply must be used.
As long as communication is detected on the bus, i.e. at least one device is an active
master, the functions are disabled. If necessary, disconnect every single active device
(PLC, MPI and, if necessary, diagnostic repeaters) from the power supply or the bus. If an
active device is at the end of the bus you want to test, its PROFIBUS connector needs to
be unplugged and connected directly to the PROFIBUS Tester 5 BC-700-PB. The bus
termination in the device connector will then be powered by the PROFIBUS Tester 5 BC-
700-PB.
Figure 22: Connection points for topology scan and cable test
Bus stations must only be disconnected from the power supply or the bus
during shutdown of the installation
