Siemens CP 343-1 - Manual (Page 48)

9 Further Notes on Operation
B3L−48
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
Release 03/2007
C79000-G8976-C198-04
Automatic Setting or Individual Network Settings
As default, the CP is configured for automatic detection (autosensing). As soon as
you define a configuration manually when configuring the CP with
STEP 7/HW Config (in the properties dialog of the CP − “Port Parameters” tab),
the automatic negotiation of the network settings (autonegotiation) is no longer in
effect. If, on the other hand, the communication partner works with autonegotiation,
no communication will be established.
Only use manual configuration when the communication partner works with the
same manually set configuration.
Notice
When operating with PROFINET IO, a transmission rate of 100 Mbps full duplex is
necessary.
Further Notes:
S Autocrossing
If you disable the “automatic setting” option in the “Port Parameters” tab,
autocrossing is also disabled; which cable you can then use depends on the
role of the CP (network component or end device).
S 10/100 Mbps network components without “Autonegotiation”
If you use 10/100 Mbps network components that do not support
“Autonegotiation”, you may have to set the mode manually during CP
configuration using STEP 7 / HW Config (in the properties dialog of the CP). As
default, the CP is configured for automatic detection.
S Forcing a specific network setting instead of “Autonegotiation”
If your application requires a fixed network setting instead of “Autonegotiation”,
both partner devices must have the same setting.
S No reaction to Autonegotiation query with manual configuration
Remember that if you configure the CP manually, it will not react to an
autonegotiation query! As a result, a connected partner will not be able to make
the required network setting and communication will not be established.
Example:
If, for example, the CP is set to “100 Mbps − full duplex”, a CP connected as
partner will set “100 Mbps − half duplex”. Reason: Due to the fixed setting, no
autonegotiation response is possible; the connected partner recognizes the 100
Mbps with autosensing but nevertheless remains in half duplex.