Siemens SINUMERIK 840D sl Function Manual page 561

System variables
New system variables return the transformation types of the active chained transformations.
Description
no transformation active: 0
one transformation active: Type of 1st chained
transformation with TRACON, or type of active
transformation if not TRACON
no transformation active: 0
one transformation active: Type of 2nd chained
transformation with TRACON
are only used if more than 2 transformations are
chained.
These variables presently only return 0.
Display persistent transformation:
$P_TRAFO_CHAIN[0], $AC_TRAFO_CHAI[0]
These settings allow an active transformation to be displayed reliably in the part program or
in cycles.
Difference between a TRACON and the other transformations:
$P_TRAFO, $AC_TRAFO if no transformation is active, or $P_TRAFO_CHAIN[1],
$AC_TRAFO_CHAI[1] is interrogated for a value other than zero.
Frames
Frame adjustments for selection and deselection of the TRACON are carried out as if there
was only the first chained transformation. Transformations on the virtual axis cease to be
effective when TRAANG is selected.
JOG
The persistent transformation remains in effect when traversing with JOG.
Constraints
The persistent transformation does not change the principle operating sequences in the
NCK. All restrictions applying to an active transformation also apply to the persistent
transformation.
A RESET command still deselects any active transformation completely; the persistent
transformation is selected again. The persistent transformation is not reselected under error
conditions. A corresponding alarm is generated to indicate the error constellation.
Alarm 14401 or 14404 can be activated when TRAANG is the persistent transformation.
When the persistent transformation is active, other transformation alarms may generated in
response to errors depending on the transformation type selected.
The transformation is deselected implicitly during referencing. A RESET or START command
must be issued after referencing, in order to reselect the persistent transformation.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Kinematic Transformation (M1)
Chained transformations
NCK variable
$P_TRAFO_CHAIN[0]
$P_TRAFO_CHAIN[1]
$AC_TRAFO_CHAIN[1]
$P_TRAFO_CHAIN[2]
$AC_TRAFO_CHAIN[2] and
$P_TRAFO_CHAIN[3]
$AC_TRAFO_CHAIN[3]
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