Machine data required to configure the FFS
General ($MN_ ...)
($MM_ ... )
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SINUMERIK 840Di Manual (HBI) – 06.03 Edition
During start-up of the NCK, the cycles are loaded from the background
memory into the DRAM file system. If the configured memory is no longer
sufficient during loading, from this time on cycles still to be loaded will be
loaded into the SRAM file system. If there is insufficient space in the SRAM,
too, loading is stopped and the following alarm is output:
– Alarm: "6690 cycles from the NC card cannot be copied into the passive
Adaptation of the DRAM file system size in the machine data:
– MD18351: MM_DRAM_FILE_MEM_SIZE (size of DRAM file system)
Too little memory available in the FFS
When a cycle is stored in the DRAM file system, it is also stored in the FFS.
If there is not enough free space in the FFS, the following alarm is output:
– Alarm: "6691 cycles in the passive file system cannot be saved on the
Adaptation of the FFS size in the machine data:
– MD18332: MM_FLASH_FILE_SYSTEM_SIZE (size of the FFS)
or deletion of cycles from the DRAM file system (the cycles are also deleted
from the FFS).
11290: DRAM_FILESYSTEM_MASK (selection of directories in the DRAM)
Changed cycles cannot be saved in the background memory.
If the control is switched off although the cycles have not been saved in the
background memory, the following alarm is output the next time the NC
– Alarm: "6692 cycle has been lost".
Select directories in DRAM
Size of the Flash File System (FFS)
Size of the DRAM file system
10 NC Start-Up with HMI Advanced
10.4 Memory configuration