Siemens SINUMERIK 840D sl Function Manual page 458

M1: Kinematic transformation
7.5 Persistent transformation
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 variable
New system variables return the transformation types of the active chained transformations.
Description
no transformation active: 0
one transformation active: Type of 1st chained transfor‐
mation with TRACON, or type of active transformation if
not TRACON
no transformation active: 0
one transformation active: Type of 2nd chained transfor‐
mation 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.
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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, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions