Siemens Sinamics G120P Operating Instructions Manual page 84

Electrical installation
4.8 Signal connections
X126: PROFIBUS connection
The PROFIBUS is connected by means of a 9-pin SUB D socket (X126). The connections
are electrically isolated.
Table 4- 19 PROFIBUS interface X126
Pin
1 -
2 M24_SERV
3 RxD/TxD–P
4 CNTR–P
5 DGND
6 VP
7 P24_SERV
8 RxD/TxD–N
9 -
Note
Remote diagnostics
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.
NOTICE
Damage to the Control Unit or other PROFIBUS nodes due to high leakage currents
Significant leakage currents can flow along the PROFIBUS cable if a suitable equipotential
bonding conductor is not used and destroy the Control Unit or other PROFIBUS nodes.
• An equipotential bonding conductor with a cross-section of at least 25 mm² must be
NOTICE
Damage to the Control Unit or other CAN bus nodes due to the connection of a CAN cable
If a CAN cable is connected to the X126 interface, this can destroy the Control Unit or other
CAN bus nodes.
• Do not connect any CAN cables to the X126 interface.
84
Signal name
Not assigned
Power supply for teleservice, ground
Receive/transmit data P (B)
Control signal
PROFIBUS data reference potential
Supply voltage plus
Power supply for teleservice, + (24 V)
Receive/transmit data N (A)
Not assigned
used between components in a system that are located at a distance from each other.
Significance
Operating Instructions, 12/2014, A5E32923362A
Range
0 V
RS485
TTL
5 V ± 10%
24 V (20.4 ... 28.8 V)
RS485
Inverter cabinet units