Siemens SINAMICS G150 Operating Instructions Manual page 339

PROFIBUS connection
The PROFIBUS is connected by means of a 9-pin SUB D socket (X126). The connections
are electrically isolated.
Table 6- 25 X126 - PROFIBUS connection
Pin Signal name
1 SHIELD
2 M24_SERV
3 RxD/TxD-P
4 CNTR-P
5 DGND
6 VP
7 P24_SERV
8 RxD/TxD-N
9 -
Connectors
The cables must be connected via PROFIBUS connectors as they contain the necessary
terminating resistors.
The figure below shows suitable PROFIBUS connectors with/without a PG/PC connector.
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
Meaning
Ground connection
Power supply for teleservice, ground
Receive / transmit data P (B/B')
Control signal
PROFIBUS data reference potential (C/C')
Supply voltage plus
Power supply for teleservice P, + (24 V)
Receive / transmit data N (A/A')
Not assigned
PROFIBUS connector
without PG/PC connection
6ES7972-0BA42-0XA0
6.8 Communication via PROFIBUS DP
Range
0 V
RS485
TTL
5 V ± 10%
24 V (20.4 ... 28.8 V)
RS485
PROFIBUS connector
with PG/PC connection
6ES7972-0BB42-0XA0
Operation
337