Points To Note About Ip Configuration - Siemens SIMATIC S7-CPs Manual

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8.9

Points to note about IP configuration

Configured S7 connections cannot be operated if the IP address is assigned
over DHCP
Notice
If you obtain the IP address over DHCP, any S7 connections you may have
configured will not work. Reason: The configured IP address is replaced by the
address obtained over DHCP during operation.
8.10 Restart after detection of a duplicate IP address in the
network
To save you time-consuming troubleshooting in the network, the CP detects double
addressing in the network. 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 diagnostic 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.
When you eliminate the cause by removing the device with the same IP address or
changing its address, you must then restart the CP.
8.11 Prioritized startup in PROFINET IO
Functions
If you use RT or IRT communication, the CP supports the PROFINET functionality
"prioritized startup" for PROFINET IO devices that also support this function. A
maximum of 32 PROFINET IO devices can be configured per IO controller and
startup times with values as low as 0.5 s can be achieved simultaneously for a
maximum of 8 of these devices.
CP 443-1 for Industrial Ethernet / Manual Part B
Release 07/2010
C79000-G8976-C223−06
8 Further Notes on Operation
B−45