Siemens SINUMERIK 840D sl Function Manual page 537

TRACOOF on HMI
In accordance with the TRAFOOF programming instruction no transformation is displayed in
the G code list on the HMI user interface. System variables $P_TRAFO and $AC_TRAFO
therefore return a value of 0, the persistent transformation is operative and the BCS and
MCS coordinate systems do not coincide. The displayed MCS position always refers to the
actual machine axes.
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.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Kinematic Transformation (M1)
7.5 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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