Commissioning
10.11 Backing up and restoring the CPU configuration
Distributed I/O system
226 System Manual, 12/2016, A5E03576849-AG
The table below shows the backup of CPU data depending on the selected type of backup
and its specific characteristics:
Backup from online
device
Upload from device
(software)
Upload device as
new station
Snapshot of the
monitor values
Current values of all DBs
(global and instance data blocks)
1)
Blocks of the type OB, FC, FB and
DB
PLC tags
(tag names and constant names)
Technology objects
Actual values (bit memories, tim-
Contents of the SIMATIC memory
Entries in the diagnostics buffer
Properties of the type of backup
Backup possible for fail-safe CPUs
2)
Backup possible in operating mode
Only the values of the tags that are set as retentive are saved.
2)
Only possible in the STOP operating state and for individual fail-safe blocks.
You can find more information on the different backup types in the STEP 7 online help.
Emergency address (emergency IP)
The emergency address (emergency IP address) of a CPU was conceived for diagnostic and
downloading functions, e.g. if the CPU can no longer be reached via the IP protocol due to
loading of an incorrect project. You can find information on the emergency address in the
following FAQ on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/97649773).
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