Siemens SINAMICS G150 Operating Manual page 112

Operation
PROFIBUS Connection
The PROFIBUS is connected by means of a 9-pin Sub-D socket (X126). The
connections are electrically isolated.
Table 6-4 X126 - PROFIBUS connection
Pin Signal name
1 SHIELD
2 M24_SERV
3 RxD/TxD-P
1
4 CNTR-P
5
6
9
7 P24_SERV
8 RxD/TxD-N
9
Connectors
The cables must be connected via PROFIBUS connectors because they contain
terminating resistors.
PROFIBUS connector
without programming
device / PC connection
6ES7972-0BA41-0XA0
Fig. 6-18
Bus Terminating Resistor
The bus terminating resistor must be switched on or off depending on its position in
the bus, otherwise the data will not be transmitted properly.
Principle: the terminating resistors must only be switched on at both ends of the
bus line; the resistors must be switched off at all other connectors.
The cable shield must be connected at both ends with the greatest possible
surface area.
6-30
Power supply for teleservice, ground
Receive / transmit data P (B/B')
DGND PROFIBUS data reference potential (C/C')
VP Supply voltage plus
Power supply for teleservice P, + (24 V)
Receive / transmit data N (A/A')
-
PROFIBUS connector
with programming device /
PC connection
6ES7972-0BB41-0XA0
PROFIBUS connectors
Meaning
Ground connection
Control signal
Not used
11/03
Range
0 V
RS485
TTL
5 V ± 10 %
24 V (20.4 V -28.8 V)
RS485
SINAMICS G150
Operating Manual