Siemens NCM S7 Manual page 56

Installing and Starting the Ethernet CP with STEP 7
Table 2-1 Settings in the "Options" Tab , continued
Option
S
Replace Module without PG
S
Ethernet Profile for
Fault-Tolerant Connections
56
Meaning / Effect
With this option, you can have the configuration data of the CP stored
on the CPU. If you then replace CP, the configuration data for the
new CP are downloaded automatically from the CPU when the CP is
started up.
If you select this option, the configuration data are stored long-term
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, please read the note
below.
The following functions do not modify the configuration data on the
CPU:
S
Resetting module memory
S
Resetting to factory settings
S
Assigning an IP address
the SIMATIC Manager or the properties dialog in HW Config or
NetPro)
If you subsequently upload the configuration data from the CPU to a
PG you will always object the configuration data that were previously
on the CP (with parameters, connections, IP address).
1) Note: You should only use the assign IP address function during
commissioning; in other words, before downloading the configuration
data.
Select this profile if you use fault-tolerant communication in your
system. Fault-tolerant communication means that Industrial Ethernet
is designed with redundancy and that you have configured
fault-tolerant S7 connections.
If you select the Ethernet profile for fault-tolerant 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 fault-tolerant connections only when
you actually use fault-tolerant 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 non-redundant systems.
1)
(using the target system selection in
SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06