Commissioning
11.9 Backing up and restoring the CPU configuration
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
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11.9 Backing up and restoring the CPU configuration
11.9.1 Overview
Backup from online device
You make changes where necessary in the system operation. You add new devices,
replace existing devices or adapt the user program. If these changes result in undesirable
behavior, you can restore the plant to an earlier state. Before you load a changed
configuration to the CPU, first use the option "Backup from online device" to create a
complete backup of the current device status.
Upload from device (software)
With the option "Upload from device (software)", you load the software project data from the
CPU to an existing CPU in the project.
Upload device as new station
If you are operating a new PG/PC on a system, the STEP 7 project that was used to create
the system configuration might not be available. In this case, you upload the data to a project
in your PG/PC with the "Upload device as new station" option.
Snapshot of the monitor values
To allow you to restore the actual values after changes, back up the actual values of the data
blocks with the "Snapshot of the monitor values" option.
Overview of backup types
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
PLC tags
(tag names and constant names)
3)
Actual values (bit memories, tim-
Contents of the SIMATIC memory
Entries in the diagnostics buffer
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