Siemens SIMATIC NET SCALANCE XCM-300 Product Manual page 52

Connecting up
6.5 Industrial Ethernet
Note
Unlocking the plug with a screwdriver
If installation space is limited, you can unlock the connectors using a screwdriver, see also
"SIMATIC NET: IE FC RJ45 Plug 4x2 CAT 6A
view/102047916)".
R-45 connector technology
The attachment to Industrial Ethernet uses RJ-45 connected technology with MDI-X assignment.
Pin assignment
The following table shows the pin assignment of the R-45 connectors.
Pin number
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
MDI / MDI-X autocrossover
With the MPI/MDI-X autocrossover function, the send and receive contacts of an Ethernet port
are assigned automatically. The assignment depends on the cable with which the
communications partner is connected. This means that it does not matter whether the port is
connected using a patch cable or crossover cable. This prevents malfunctions resulting from
mismatching send and receive wires. This makes installation much easier for the user.
Note
Formation of loops
Please note that the direct connection of two ports on the IE switch or accidental connection
over several IE switches causes an illegal loop. Such a loop can lead to network overload and
network failures.
52
(https://support.industry.siemens.com/cs/ww/en/
Assignment
10/100 Mbps
RD+
RD-
TD+
n. c. (Not connected)
n. c. (Not connected)
TD-
n. c. (Not connected)
n. c. (Not connected)
10/100/1000 Mbps
D1+
D1-
D2+
D3+
D3-
D2-
D4+
D4-
Product Manual, 04/2022, C79000-G8976-C585-01
R-45 connector
SCALANCE XCM-300