X126: Profibus; Table 2-6 Profibus Interface X126 - Siemens SINAMICS S120 Equipment Manual

2.2.3.7

X126: PROFIBUS

The PROFIBUS interface is a standard interface on every Control Unit.
Table 2-6 PROFIBUS interface X126
Pin
1
2
3
4
5
6
7
8
9
Type: 9-pin SUB-D female
Note
A teleservice adapter can be connected to the PROFIBUS interface (X126) for remote
diagnosis purposes.
The power supply for the teleservice terminals 2 and 7 withstands a max. load and continued
short-circuit current of 150 mA.
Caution
If the CAN connector is mistakenly plugged into the PROFIBUS connector, this can destroy
the CAN master.
Terminating resistors
The first and last nodes in a bus must contain terminating resistors. Otherwise data
transmission will not function correctly.
The cable shield must be connected at both ends over large-surface area contacts.
Equipment Manual Control Units and Additional System Components
Equipment Manual, (GH1), 12/2004 Edition, 6SL3097-2AH00-0BP1
Signal name Meaning
SHIELD Ground connection
M24_SERV Power supply for teleservice, ground
RxD/TxD–P Receive/transmit data P (B/B')
CNTR–P Control signal
DGND PROFIBUS data reference potential (C/C')
VP Supply voltage plus
P24_SERV Power supply for teleservice, + (24 V)
RxD/TxD–N Receive/transmit data N (A/A')
- Do not use
Control Units
2.2 Control Unit 320 (CU320)
Range
0 V
RS485
TTL
5 V + -10 %
24 V (20.4 V – 28.8 V)
RS485
2-11