Restart After Detection Of A Duplicate Ip Address In The Network - Siemens SIMATIC S7-400 Operating Instructions Manual

Configuration and operation
4.6 Interface configuration
You will find information on the currently used network settings here:
● In special diagnostics under the diagnostics object "Industrial Ethernet" in the "Network
Connection" group box
● in STEP 7 with the menu command "PLC > Module Information"
● In Web diagnostics
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.
● Fixed mode instead of "Automatic setting"
If for certain applications, you require fixed network settings instead of the automatic
setting, 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.
● Recommendation: Load individual network settings only using MPI
If you modify the network settings in the properties dialog of the port ("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. In
some situations, the device may then no longer be obtainable over Ethernet or the
running load action is not completed due to configuration changes taking immediate
effect and an inconsistent configuration is reported.
If you have set network properties manually we therefore recommend that you download
configuration data to the S7 station over an MPI connection.
4.6.2

Restart after detection of a duplicate IP address in the network

To save you timeconsuming troubleshooting in the network, the CP detects double
addressing in the network.
Behavior during operation (CP in RUN)
If the CP detects double addressing on the network (new node with an IP address that has
already been assigned), a message is generated in the diagnostics buffer and the bus fault
LED lights up.
To acknowledge the bus fault LED in RUN mode, set the CP to STOP and then restart it.
After the device with the duplicate IP address has been removed from the network, the bus
fault LED goes off automatically.
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Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA