Siemens S7-300 Configuration Manual page 47

Option / input area
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Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
Module replacement without
a PG (S7-300)
Ethernet profile for fault-
tolerant connections
Individual network settings
Configuring the Ethernet CP with STEP 7
Meaning / effect
With this option, you can decide whether or not the configuration
data of the CP is stored on the CPU. If you replace the CP, the
configuration data for the CP is transferred automatically from the
CPU to the CP when it starts up.
If you select this option, the configuration data is stored in non-
volatile memory on the CPU instead of in the EEPROM of the CP.
Remember, however, that long-term storage on the CPU is only
safe from power outages if the CPU is protected by battery backup
or by using an S7 memory card.
Note
If you store the configuration data on the CPU, read the note
below.
The configuration data on the CPU is not modified by the following
functions:
Reset module memory
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Reset to factory settings
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Assign IP address
• 1)
If you subsequently upload the configuration data from the CPU to
a PG you will always object the configuration data that was
previously on the CP (with parameters, connections, IP address).
1) Note: The assign IP address function should only be used
during commissioning and not before downloading the
configuration data.
Select this profile if you use faulttolerant communication in your
system. Faulttolerant communication means that Industrial
Ethernet has been set up with redundancy and that you have
configured faulttolerant S7 connections.
If you select the Ethernet profile for faulttolerant connections here,
the time response of the S7 connections is adapted. As a result,
breakdowns of a connection are detected more quickly and the
failover to redundant connections is faster.
Note
Select the Ethernet profile for faulttolerant connections only when
you actually use faulttolerant S7 connections. Otherwise you must
expect your system to be more susceptible to problems since, for
example, the number of transfer or connection establishment
attempts is reduced compared with nonredundant systems.
Here, you can make fixed network settings, when necessary. The
"Automatic setting" is selected by default. In normal situations, this
guarantees problem-free communication. Where possible, leave
the "Automatic setting" unchanged.
If problems do occur in communication (such as when connections
cannot be established or frequent network disruptions occur), this
may be the result of unsuitable network settings, either selected or
automatic. In this case, you should select a network setting that is
suitable for your network configuration.
3.3 Setting further CP properties
47