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Notes on configuration and operation
6.6 IP configuration
6.6
IP configuration
6.6.1
Detection of double IP addressing in the network
To save you timeconsuming troubleshooting in the network, the CP detects double
addressing in the network.
The reaction of the CP when double addressing is detected varies as follows:
● CP during startup
● CP in RUN mode
6.6.2
Obtain IP address vie DHCP: CP STOP on expiry of the lease
If you have configured "Obtain IP address from a DHCP server", when the CP starts up, it is
assigned a valid IP address by the DHCP server for a restricted time (period of the lease).
Note
STOP on expiry of the lease
The CP changes to STOP and loses the previously assigned IP address if the DHCP server
does not extend it before expiry of the lease. All communication connections are terminated.
46
When the CP starts up (following a power down or after assigning an Ethernet address),
a query for its own IP address is sent into the network. If a response is sent in reply, the
CP does not start up! The error is indicated by the LEDs ("Stopped (STOP) with error" +
"BF" LED is displayed) and an entry is made in the internal diagnostics buffer.
The CP remains in STOP mode.
When you eliminate the cause by removing the device with the same IP address or by
changing its address, you then need to restart the CP.
If a double IP address is detected, the CP also reports this via the LED (BF) and
generates an entry in the diagnostics buffer.
The CP remains in RUN mode.
If the conflict is eliminated on another component, the "BF" LED goes off again.
Manual, 10/2012, C79000−G8976−C201-07
CP 343-1
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