Siemens D410 Benutzerhandbuch

 

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)!