Siemens CPU 1518-4 PN/DP ODK Manual page 29

PROFINET interface X1 with 2-port switch (X1 P1 R and X1 P2 R)
The assignment corresponds to the Ethernet standard for an RJ45 plug.
● 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).
PROFINET interface X2 and X3 with 1 port (X2 P1, X3 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).
● Autocrossing is always active on X3. This means the RJ45 socket is allocated either as
data terminal equipment (MDI) or a switch (MDI-X).
Figure 3-2
CPU 1518-4 PN/DP ODK (6ES7518-4AP00-3AB0)
Manual, 09/2016, A5E35681108-AA
Interfaces X2 and X3
Connecting up
29