Siemens SIMATIC S7-1500 Manual page 38

Connecting up
PROFINET interface X1 with 2-port switch (X1 P1 R and X1 P2 R)
The assignment corresponds to the Ethernet standard for a RJ45 connector.
• When autonegotiation is deactivated, the RJ45 socket is allocated as a switch (MDI-X).
• When autonegotiation is activated, autocrossing is in effect and the RJ45 socket is
allocated either as data terminal equipment (MDI) or a switch (MDI-X).
Figure 4-1 Interface assignment X1
PROFINET interface X2 and X3 with 1 port (X2 P1, X3 P1)
The assignment corresponds to the Ethernet standard for a RJ45 connector.
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CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC