Commissioning
7.5 User memory concept
SIMOTION C
Operating Instructions, 02/2012
153
Backup of non-volatile data
The "_savePersistentMemoryData" system function is used to save the contents of "non-
volatile data" to the MMC. 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 the system side, this system function ensures that a consistent overall image of
the non-volatile data is always available the next time the unit is powered on, 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 memory card), the existing backup
file is used in the next attempt to restore the content of the "non-volatile data". The backup
file is deleted if the new file was successfully created.
NOTICE
If you do not save the "non-volatile data" to the MMC, it is lost when a spare part is used (in
the event of a module defect).
If an absolute encoder overflow occurs after _savePersistentMemoryData, the actual
position value is no longer correct after the non-volatile data is restored. In this case,
homing (absolute encoder adjustment) must be repeated.
Power failure
The "non-volatile data" is saved to the NVRAM of the SIMOTION C during a power failure.
The "non-volatile data" is available again at the next ramp-up. Thus, the SIMOTION C is
immediately ready for operation without data loss.
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