Siemens simovert masterdrives CBP/CBP2 Mode D'emploi page 76

05.2006
Cable connectors
NOTE
Bus terminating
resistors
Siemens AG 6SE7087-6NX84-0FF5
SIMOVERT MASTERDRIVES
The cables must be connected via the PROFIBUS connector, as this
contains the bus terminating resistors.
The possible PROFIBUS connectors with the different cable outputs
are illustrated in the following.
Fig. 2-4 PROFIBUS connectors
PROFIBUS connectors with 90° angle
– must not be inserted in slots E and G on Compact units
– if these connectors are used on CompactPLUS units contour faults
may occur on slots A and B.
(See Compendium, Chapter "PROFIBUS", Section "Connecting the
CBP to PROFIBUS".)
The terminating resistors at the first and last nodes in the line have to
be activated because otherwise data transfer is not able to operate
satisfactorily.
The cable shield must be connected on both sides and through a large
surface area.
First bus node
on
off
Bus termination
From previous bus node
Fig. 2-5 Position of the bus terminating resistors
CBP2 only:
X448 pin assignments for connection to USS.
The connections are floating.
Option boards
CBP/CBP2 – Communication Board PROFIBUS
on
off
Bus termination
To next bus node
Last bus node
on
off
2-5