Siemens SINUMERIK 840D sl Function Manual page 911

2.4.10 Data backup
Data block _N_CHANx_UFR is used to archive the system frames.
Machine data
MD28082 $MC_MM_SYSTEM_FRAME_MASK
should not have changed between saving and reintroducing the saved system frames. If it
has changed then it is possible that saved system frames could no longer be loaded.
In this case, the loading process triggers an alarm.
Data backup always takes place in accordance with the currently valid geometry axis
assignment, not in accordance with the axis configurations set in the machine data.
The machine data
$MC_MM_SYSTEM_DATAFRAME_MASK
can be used to configure data management frames for the system frames.
If you do not want a data management frame for a system frame, the frame does not have to
be saved. With G500, G54 to G599, the active frame is retained.
A separate data block _N_NC_UFR is used to archive global frames.
The block requested by the HMI is created if the machine data
MD18601 $MN_MM_NUM_GLOBAL_USER_FRAMES
or
MD18602 $MN_MM_NUM_GLOBAL_BASE_FRAMES
has a value greater than zero.
Channel-specific frames are saved in data block _N_CHANx_UFR.
In certain circumstances, alarms could be triggered when reintroducing saved data, if the
frame affiliates, be they NCU global or channel-specific, have been changed using machine
data.
Data backup always takes place in accordance with the axis configuration set in the machine
data, not in accordance with the currently valid geometry axis assignment.
Basic logic functions: Axes, coordinate systems, frames (K2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed description
2.4 Frames
127