Siemens SINUMERIK 840D sl Function Manual page 561

Note
In the case of a program interruption (Repos, deletion of distance to go, ASUBs, etc.), the
control system requires a number of different blocks that have already been executed for the
repositioning operation. The rule forbidding the machine data of an active transformation to
be altered also refers to these blocks.
Example:
Two orientation transformations are set via machine data, e.g. MD24100
$MC_TRAFO_TYPE_1 = 16, MD24200 $MC_TRAFO_TYPE_2 = 18.
Assume that the second transformation is active when the NEWCONFIG command is
executed. In this case, all machine data that relate only to the first transformation may be
changed, e.g.:
MD24500 $MC_TRAFO5_PART_OFFSET_1
but not, for instance:
MD24650 $MC_TRAFO5_BASE_TOOL_2
or
MD21110 $MC_X_AXIS_IN_OLD_X_Z_PLANE
Furthermore, another transformation (TRANSMIT) can be set, for example with MD24300
$MC_TRAFO_TYPE_3 = 256 and can be parameterized with additional machine data.
Defining geometry axes
Geometry axes must be defined before starting the control system with the following
machine data:
MD24120 $MC_TRAFO_GEOAX_ASSIGN_TAB_X[n]
or
MD20050 $MC_AXCONF_GEOAX_ASSIGN_TAB[n]
Changing the assignment
The assignment of a transformation data set to a transformation is determined by the
sequence of entries in MD24100 $MC_TRAFO_TYPE_X. The first entry in the table is
assigned to the first transformation data set, and accordingly the second entry to the second
data set. This assignment may (and can) not be altered for an active transformation.
Example:
Three transformations are set, two orientation transformations and one Transmit
transformation, e.g.
MD24100 $MC_TRAFO_TYPE_1 = 16
; orientation transformation, 1st orientation trafo data set
MD24200 $MC_TRAFO_TYPE_2 = 256 : Transmit transformations
MD24300 $MC_TRAFO_TYPE_3 = 18
; orientation transformation, 2nd orientation trafo data set
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
7.8 Activating transformation machine data via parts program/softkey
Kinematic Transformation (M1)
561