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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.

Note

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.

8.6 Deleting data

8.6.1 Overview of data deletion

You can define the scope of data to be deleted from SIMOTION C memory described in the

"user memory concept". This enables you to determine whether data in your system should

be deleted completely or partially.

You have the following options for deleting SIMOTION C data:

● SIMOTION C memory reset

● Deleting user data from the micro memory card

● Setting SIMOTION C to factory settings

Siemens SIMOTION User Manual

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