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Notes on configuration and operation
6.4 Influence of MPI on connections via Industrial Ethernet
● Recommendation: Change "individual network settings" only over MPI
6.4
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.
● 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.
44
If you modify the LAN settings in the properties dialog of the CP in the "Port Parameters"
tab, these changes will be adopted by the CP and activated when the configuration data
is downloaded to the CP. 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 then, 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.
Exceptions: This does not apply when using CPUs with a separate communication bus,
for example:
CPU 318-2, CPU 317-2 PN/DP, CPU 319-3 PN/DP, CPU 315-2 PN/DP,
CPU 315F-2 PN/DP, CPU 317-2 DP, CPU 317T-2 DP, CPU 317F-2 DP,
CPU 317F-2 PN/DP, CPU 319-3 PN/DP
Manual, 10/2012, C79000−G8976−C201-07
CP 343-1
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