Siemens SIMATIC S7-1500 Manual page 38

Connecting up
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
Note
PROFINET interface X3 with a transmission rate of 1000 Mbps
The PROFINET interface X3 supports a maximum transmission rate of 1000 Mbps.
Requirements:
• Devices on the PROFINET segment must support the 1000 Mbps transmission rate.
• The network infrastructure (network cables and outlets) must be category CAT 5e or
higher.
• The "Transmission rate" parameter in the properties of the port (X3) must be set as
follows in STEP 7:
– The "Autonegotiation" check box is selected
– "Automatic" is selected in the drop-down list
38
Interfaces X2 and X3
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA