Siemens Simatic S7-1500

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 4-5Pin assignment of PROFIBUS interface
View Pin Signal name Designation
1 - -
2 - -
3 RxD/TxD-P Data line B
4 RTS Request to send
5 M5V2 Data reference potential (from station)
6 P5V2 Supply plus (from station)
7 - -
8 RxD/TxD-N Data line A









9 - -
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.
4.4 Digital inputs and outputs of X122, X132 and X142
The digital inputs and digital outputs at the X122, X132 and X142 sockets are intended for
connection of sensors and actuators.
Characteristics of X122, X132 and X142
Table 4-6Interfaces X122, X132 and X142
Properties Version
Connector type Spring-loaded terminal, 14-pin
Number of connectable conductors 1
Connectable conductor types and conductor cross-sections
• Solid 0.2mm²… 1.5mm²
• Flexible 0.2mm²… 1.5mm²
48
SIMATIC Drive Controller
Equipment Manual, 11/2022, A5E46600370-AC
Connecting
4.4 Digital inputs and outputs of X122, X132 and X142