Siemens SIMATIC S7-1500 Manual page 46

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.
The table below shows how the MAC addresses are assigned.
Table 3- 3 Assignment of the MAC addresses
MAC address 1
MAC address 2
MAC address 3
MAC address 4
MAC address 5
MAC address 6
MAC address 7
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB
Assignment
PROFINET interface X1
(visible in STEP 7 for accessible devices)
Port X1 P1 R (required for LLDP, for example)
Port X1 P2 R (required for LLDP, for example)
PROFINET interface X2
(visible in STEP 7 for accessible devices)
Port X2 P1 (required for LLDP, for example)
PROFINET interface X3
(visible in STEP 7 for accessible devices)
Port X3 P1 (for C/C++ Runtime applications)
Labeling
• Front printed
• Right side printed
(start of number range)
---
---
Front printed
---
Front printed
• Front printed
• Right side printed
(end of number range)
Connecting up
45