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Transmission Speed Of The Gigabit Interface - Siemens SIMATIC NET CP 443-1 Advanced Manual

S7-400 - industrial ethernet
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Further notes:
● 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.
● 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.
● No reaction to Autonegotiation query with manual configuration
Remember that if you configure the CP manually and the "Autonegotiation" option is
disabled, it will not react to an autonegotiation query! As a result, a connected partner
may not be able to set the required mode and communication will not be ideal.
Example:
If the CP is set to "100 Mbps - full duplex" and autonegotiation is disabled, a CP
connected as partner will set "100 Mbps - half duplex". Reason: Due to the fixed setting,
an autonegotiation reply is not possible. Although the connected partner detects
100 Mbps with autosensing, it remains at 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 "Options" tab using
the "Transmission medium/Duplex" drop-down list, these changes will be adopted by the
CP and activated when the configuration data is downloaded to the target system
(STEP 7). 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 settings" are now changed to 100 Mbps full duplex, the download
cannot be completed.
6.5.1.3

Transmission speed of the gigabit interface

If you want to use transmission speed 1 Gbps, leave the interface set to "Automatic
settings".
The connection partner must also be configured with "1 Gbps full duplex" or with "Automatic
settings". If the connection partner does not support gigabit Ethernet, the data will be
transferred at the next lower speed (100 or 10 Mbps).
CP 443-1 Advanced (GX30)
Manual, 03/2019, C79000-G8976-C256-05
Configuration and operation
6.5 Interface configuration
71

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