Siemens SIMATIC S7-1500 Equipment Manual page 31

PROFINET interface X2 with 1 port (X2 P1)
The assignment corresponds to the Ethernet standard for an RJ45 plug.
Autocrossing is always active on X2. This means the RJ45 socket is allocated either as data
terminal equipment (MDI) or a switch (MDI-X).
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 4-2 PROFIBUS interface pin assignment
NOTE
Supply of I/O devices
The CPU 1516T-3 PN/DP does not provide a 24 V DC power supply on 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 innovative successor product, PC adapter USB A2, receives the required power supply via
the USB port. This means it does not need a 24 V DC supply voltage and can be operated
without a plug-in power supply set for external power supply.
Reference
You can find additional information on the topics of "Connecting the CPU" and
"Accessories/spare parts" in the S7-1500, ET 200MP
(https://support.automation.siemens.com/WW/view/en/59191792) system manual.
Assignment of the MAC addresses
CPU 1516T-3 PN/DP has two PROFINET interfaces, with the first interface having two ports.
The PROFINET interfaces each have a MAC address, and each of the PROFINET ports has its
own MAC address. The CPU 1516T-3 PN/DP therefore has five MAC addresses in total.
The MAC addresses of the PROFINET ports are needed for the LLDP protocol, for example for
the neighborhood discovery function.
CPU 1516T-3 PN/DP (6ES7516-3TN00-0AB0)
Equipment Manual, 11/2022, A5E40898375-AC
View
5
9
4
8
3
7
2
6
1
Signal name
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 - -
Connecting up
Description
31