8 Further Notes on Operation
B
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38
CP 443-1 for Industrial Ethernet / Manual Part B
Release 07/2010
C79000-G8976-C223
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06
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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 will not be able to set the required mode and communication
will not be ideal.
Example:
If, for example, the CP is set to “100 Mbps
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full duplex” and autonegotiation is
disabled, a CP connected as partner will set “100 Mbps
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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.
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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” list box, 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, 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.
8.3
PROFINET IO mode with IRT communication
8.3.1
Types of synchronization
Within an IRT domain (Isochronous Real Time), you can use the CP for IRT
communication.
You specify the required synchronization parameters in the properties dialog of the
ERTEC interface (HW Config: Row “X1 (<device name>)”) in the “Synchronization”
tab.