Siemens Simantic S7-1500 - PROFIBUS Interface X3 Pin Assignment

Wiring
CPU 1517T-3 PN/DP (6ES7517-3TP00-0AB0)
Manual, 12/2017, A5E36285525-AB
31
PROFIBUS interface X3
The table below shows the pin assignment of the PROFIBUS interface. The assignment
corresponds to the standard assignment of an RS485 interface.
Table 3- 1 PROFIBUS interface pin assignment
View
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
CPU
1517T-3 PN/DP does not provide a 24 V
DC power supply on the PROFIBUS interface.
I/O devices (for example, PC adapter USB) are therefore only operational on the interface in
conj
unction with a plug-in power supply set for external power supply.
The innovative successor product, PC adapter USB
A2, receives the required power supply
via the USB port. The USB
A2 PC adapter therefore does not require a 24 V DC supply
voltage and can b
e operated
without
a plug-in power supply set for external power supply.
Reference
You can find additional information on the topics of "Wiring the CPU" and "Accessories/spare
parts" in the S7-1500, ET 200MP
(http://support.automation.siemens.com/WW/view/en/59191792) system manual.