Further notes on operation
8.2 Network settings with Fast Ethernet / gigabit Ethernet
CP 343-1 ERPC
58 Manual, 03/2010, C79000-G8976-C239-02
● 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 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.
● Recommendation: Change "individual network settings" only over MPI
If you modify the LAN settings in the properties dialog of the CP in the “Port Parameters"
tab, these changes will be adopted by the CP and activated when the configuration data
is downloaded to the CP. In some situations, the device may then no longer be
obtainable over Ethernet.
We therefore recommend that you download configuration data to the S7 station over an
MPI connection if you change this setting.
If you download the configuration data over the LAN interface then, depending on the
selected setting, it is possible that the current download will not be completed due to the
changes to the configuration taking immediate effect and an inconsistent configuration is
reported.
Example:
The download is started initially with the setting TP/ITP at 10 Mbps half duplex. If the
"Individual network setting" is now changed to 100 Mbps full duplex, the download cannot
be completed.
8.2.2 Gigabit Ethernet
Transmission speed 1 Gbps
If you want to use transmission speed 1 Gbps, leave the interface set to "Automatic
settings".
The connection partner must also be configured with the automatic setting (autonegotiation).
If the connection partner does not support gigabit Ethernet, the data will be transferred at the
next lower speed (100 or 10 Mbps).
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