Siemens D410 Startup of SIMOTION D410 , Backup of non-volatile data

Commissioning (hardware)
2.5 User memory concept
D410
Commissioning Manual, 08/2008 Edition 39
Startup of SIMOTION D410
The SIMOTION kernel is loaded from the CompactFlash Card to the "volatile data" area
during the startup of SIMOTION D410.
Volatile data is lost if you shut down the SIMOTION D410 module after the download. Data
loaded from the CompactFlash Card at the next restart:
● The technology packages and user data to the "volatile data" area
● IP and DP parameters to the "non-volatile data" area
Backup of non-volatile data
The "_savePersistentMemoryData" system function is used to save the contents of non-
volatile data to the CompactFlash Card. This backup prevents the retain variables and the
absolute encoder position from being lost if a component is replaced.
The backup copy is saved to the "PMEMORY.XML" backup file in the "USER/SIMOTION"
folder. On system side it is always ensured that a consistent overall image of the non-volatile
data is available at the next restart, even if there is a power failure during backup. An already
existing backup file is renamed to "PMEMORY.BAK" before a new backup file is generated.
If the backup to this new file fails (for example, due to insufficient storage capacity of the
CompactFlash Card), the existing backup file is used in the next attempt to restore the
content of non-volatile data. The backup file is deleted if the new file was successfully
created.
NOTICE
An absolute encoder overflow after "_savePersistentMemoryData" was executed indicates
that the restored non-volatile data contains an incorrect actual position value. The encoder
must be referenced again (absolute encoder adjustment)!