Siemens SIMATIC S7-1500 Manual page 40

Connecting up
PROFIBUS interface X4
The table below shows the terminal assignment of the PROFIBUS interface. The assignment
corresponds to the standard assignment of an RS485 interface.
Table 4-2 PROFIBUS interface terminal assignment
NOTE
Supply of I/O devices
The CPU 1518‑4 PN/DP MFP 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.industry.siemens.com/cs/ww/en/view/59191792) system manual.
Assignment of the MAC addresses
The CPU 1518‑4 PN/DP MFP has three PROFINET interfaces. The first interface is an interface
with 2-port switch. The PROFINET interfaces each have a MAC address, and each of the
PROFINET ports has its own MAC address. The CPU 1518‑4 PN/DP MFP therefore has seven
MAC addresses in total.
The MAC addresses of the PROFINET ports are needed for the LLDP protocol, for example for
the neighborhood discovery function.
The number range of the MAC addresses is sequential. The first and last MAC addresses are
lasered on the rating plate on the right side of each CPU 1518‑4 PN/DP MFP.
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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
- -
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC
Designation