Siemens SINUMERIK 840D sl Function Manual page 554

M1: Kinematic transformation
7.5 Chained transformations
Effects on HMI operation
As a transformation is always active with the persistent transformation, the HMI user
interface is adapted accordingly for the selection and deselection of transformations:
TRACON on HMI
Accordingly the HMI operator interface does not display TRACON, but the first chain
transformation of TRACON e.g. TRANSMIT . Accordingly, the transformation type of the 1st
chained transformation is returned by the corresponding system variable, i.e. $P_TRAFO
and $AC_TRAFO. Cycles written in TRANSMIT can then be used directly.
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.
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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]
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions