Siemens SIMATIC S7-CPs Manual page 37

Autocrossing mechanism
With the autocrossing mechanism integrated in the switch, it is possible to use a
standard cable to connect the PC/PG. A crossover cable is not necessary.
Notice
Manual configuration
If you have set a port to manual configuration and select the "Disable
autonegotiation/autocrossover" option, the autocrossing mechanism is also
disabled for this port. The port then behaves like the interface of a switch. In this
case, the following applies:
S
Connecting an end device
To connect an end device that does not have the autocrossing mechanism (for
example CP 443-1 with order number 6GK7 443-1EX11-0XE0), you must not
use a crossover cable.
S
Connecting to a switch
To connect a switch, that does not support the autocrossing mechanism, use a
crossover cable.
STEP 7 / NCM Diagnostics and Web diagnostics display the network setting
Diagnostics of the port settings for the CP described here is possible using the
entries in the diagnostic buffer over SNMP, NCM diagnostics, and the LED
displays.
You will find information on the currently used network settings in STEP 7 as
follows:
S In NCM Diagnostics under the diagnostic object "Industrial Ethernet" in the
"Network Attachment" group box;
S In HW Config with the menu command "PLC > Module Information";
S In WEB diagnostics.
Further notes:
S 10/100 Mbps network components without "Autonegotiation"
If you use 10/100 Mbps network components that do not support
"Autonegotiation", it is possible that you will have to set the mode manually.
S Forcing a specific mode instead of "Automatic settings"
If your application requires a specific mode instead of the automatic settings,
you will need to match up the partner devices.
CP 443-1 for Industrial Ethernet / Manual Part B
Release 07/2010
C79000-G8976-C223−06
8 Further Notes on Operation
B−37