Profibus X126 - Siemens SIMATIC S7-1500 Manual

3.3

PROFIBUS X126

The SIMATIC Drive Controller has a PROFIBUS DP interface (X126).
Pin assignment of X126 interface
The table below shows the pin assignment of the PROFIBUS interface. The assignment
corresponds to the standard assignment of an RS485 interface.
Table 3- 5
Note
Supply of I/O devices
The SIMATIC Drive Controller does not make a 24 V DC supply voltage available at the
PROFIBUS interface. I/O devices (for example, PC adapter USB 6ES7972-0CB20-0XA0)
are only operational on the interface in conjunction with a plug-in power supply set for
external power supply.
The innovated successor product, PC adapter USB A2 (6GK1571-0BA00-0AA0), obtains the
needed supply voltage via the USB port. For this reason, it does not need a 24 V DC power
supply. You can operate the PC adapter USB A2 without a plug-in power supply set for
external power supply.
SIMATIC Drive Controller
Equipment Manual, 11/2019, A5E46600370-AA
Pin assignment of PROFIBUS interface
View Pin
1
2
3
4
5
6
7
8
9
Signal name
- -
- -
RxD/TxD-P Data line B
RTS Request to send
M5V2 Data reference potential (from station)
P5V2 Supply plus (from station)
- -
RxD/TxD-N Data line A
- -
Connecting
3.3 PROFIBUS X126
Designation
49