Further notes on operation
8.3 Influence of MPI on connections via Industrial Ethernet
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
59
8.3 Influence of MPI on connections via Industrial Ethernet
Adding/removing MPI nodes
If a station on the MPI bus is added or removed, for example because a service PG has
been connected or disconnected, it is possible that active communication connections on the
communications bus are aborted. This has the following effects on the communication
connections on Industrial Ethernet:
● All S7 connections are temporarily aborted.
Exceptions: This does not apply when using CPUs with a separate communication bus,
for example:
– CPU 315-2 PN/DP, CPU 315F-2 PN/DP
– CPU 317-2 PN/DP, CPU 317-2 DP, CPU 317T-2 DP, CPU 317F-2 DP,
CPU 317F-2 PN/DP
– CPU 318-2, CPU 318-2 DP
– CPU 319-3 PN/DP
● The connections on which a job with a data length > 240 bytes is being processed on the
communication bus are aborted temporarily.
● FETCH/WRITE connections are temporarily aborted.
On the FC interface in the user program, the condition codes made up of the DONE,
ERROR and STATUS parameters must be evaluated in FC11 / FC12.
8.4 IP configuration
8.4.1 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.
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