Siemens CBP Manual Del Usuario página 74

06.2005
Cable connectors
Bus terminating
resistors
X448 -
USS
5
9
6
1
NOTICE
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
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.
Pin Designation
1 SHIELD
2 -
3 RxD/TxD-P
4 -
5 DGND
6 VP
7 -
8 RxD/TxD-N
9 -
Table 2-3 Connection X448
The CBP2 does not have an internal bus connection. An external bus
connection can be wired to pins 5/6.
Option boards
CBP/CBP2 – Communication Board PROFIBUS
on
off
Bus termination
To next bus node
Significance
Ground connection
Not connected
Receive/transmit data - P (B / B')
Not connected
data reference potential (C / C')
Supply voltage Plus
not connected
Receive/transmit data - N (A / A')
not connected
Last bus node
on
off
Range
RS485
5 V ± 10 %
RS485
2-5