Data Backup; Plc Series Startup, Plc Archive - Siemens SINUMERIK 840D sl Function Manual

P3: Basic PLC program for SINUMERIK 840D sl
13.7 Starting up the PLC program
13.7.5

Data backup

The PLC-CPU does not save any symbolic names, but instead only the datatype descriptions
of the block parameters VAR_INPUT, VAR_OUTPUT, VAR_IN_OUT, VAR and the datatypes
of the global data blocks.
Note
No sensible recompilation is possible without the related project for this machine. This
especially affects, for instance the function status of the block or the necessary changes done
in the PLC-CPU programs later. It is, therefore, necessary to keep a backup copy of the STEP
7 project located in the PLC CPU on the machine. This is a great help for the service case and
saves unnecessary consumption of time in restoring the original project.
If the STEP 7 project exists and has been created according to the instructions given above,
then symbols can be processed in the PLCCPU on this machine. It may also be advisable to
store the machine source programs as ".awl" files in case they are required for any future
upgrade.
The source programs of all organization blocks and all instance data blocks should always be
available.
13.7.6

PLC series startup, PLC archive

Once the blocks have been loaded to the PLC CPU, a series archive can be generated via the
HMI user interface to back up data on the machine. To ensure data consistency, this backup
must be created immediately after block loading when the PLC is in the Stop state. It does not
replace the SIMATIC project backup as the series archive saves binary data only. For instance,
no symbolic information is present here. In addition, no CPU DBs (SFC 22 DBs) or SDBs
generated in the CPU are saved.
Selection of the SINUMERIK archiving program
The PLC series archive can be generated directly from the SIMATIC project as an alternative.
● Open the "Settings" dialog box in the SIMATIC Manager: Menu bar "Tools" > "Settings"
● Open the "Archive" tab
● Select the the SINUMERIK archiving program "SINUMERIK (*.arc)" in the "Preferred
archiving program" drop-down list box.
Start of the SINUMERIK archiving program
The SINUMERIK archiving program is started in the SIMATIC Manager via the menu command
"File" > "Archive".
The PLC archive is generated after assigning the archive name. If a project contains several
program paths, the S7 program for which the PLC archive will be created can be selected in
the dialog box. All blocks contained in the selected program path are archived (except data
blocks created with SFC22 (online) in the CPU).
The "SDB archive" function can be activated or deactivated for the archiving program. If "SDB
archive" is activated, a PLC archive is created that only contains the system data blocks (SDB)
of the selected program path.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions