Siemens SINUMERIK 840Di Function Manual page 820

Detailed Description
2.4 Frames
2.4.7.3 Adapting active frames
The geometry axis configuration can change during program execution or on RESET. The
number of available geometry axes can vary from zero to three. With unavailable geometry
axes, components in the active frames (e.g., rotations) can lead to the active frames for this
axis configuration becoming invalid. This is indicated by the alarms below:
Channel %1 block %2 rotation programmed for non-existent geometry axis
This alarm remains present until the frames have been changed accordingly.
The machine data below can be used to switch on the automatic adaptation of active frames,
thus preventing alarm 16440:
MD24040 $MC_FRAME_ADAPT_MODE
Bitmask for adapting the active frames with reference to the axis constellation.
The following settings apply:
Bit 0:
Bit 1:
Bit 2:
With machine data setting
MD24040 $MC_FRAME_ADAPT_MODE = 1,
all rotations in the active frames, which could produce coordinate axis movements for non-
existent geometry axes, are deleted.
The data management frames are not changed. Only the possible rotations are applied
when the data management frames are activated.
Example:
No y axis exists:
MD20050 $MC_AXCONF_GEOAX_ASSIGN_TAB[0] = 1
MD20050 $MC_AXCONF_GEOAX_ASSIGN_TAB[1] = 0
MD20050 $MC_AXCONF_GEOAX_ASSIGN_TAB[2] = 3
$P_UIFR[1] = crot(x,45,y,45,z,45)
N390 G54 G0 X10 z10 f10000
if $P_IFRAME <> crot(y,45)
setal(61000)
endif
2-90
Rotations in active frames, which rotate coordinate axes with no geometry axes, are
deleted from the active frames.
Shear angles in the active frames are orthogonalized.
Scalings of all geometry axes in the active frames are set to value 1.
; Only the rotation about y is taken over.
Axis Types, Coordinate Systems, Frames (K2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0