Softing PROFIBUS Tester 4 BC-600-PB, Manual

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BC-600-PB Connection to PROFIBUS
Softing Page 25
Attention: Bus stations must only be disconnected from the power
supply or the bus during shutdown of the installation.
Attention: The two functions can be started also when the PROFIBUS
Tester 4 is disconnected from the bus. If you then connect the
PROFIBUS Tester 4 to a live bus despite the yellow bus status bar
indicated by the PC software, this can cause bus communication
problems or a shutdown of the installation.
7.4.1 Special case: Active devices at both ends of the bus
On the very rare occasion when there is an active device at each end of the
bus, do the following:
1. When using D-sub connection:
•
Additionally switch on the terminating resistor in the D-sub
connector of the last slave. The outgoing cable to the active
device at the bus end has to be connected to the outgoing
connector (marked with “OUT”, an outgoing arrow, or “A2/B2”).
Fig. 18: Checking the connection direction at the D-sub connector
2. When using M12 connection:
•
The cable from the bus start or test tool has to be connected to
the incoming M12 connector of the last slave. A bus termination is
required at the outgoing M12 connector of the last slave.