Siemens SINUMERIK 840DE sl Function Manual page 50

M1: Kinematics transformation
2.2 TRACYL cylinder surface transformation (option)
TRACYL_ROT_SIGN_IS_PLUS_<t>
If the direction of rotation of the rotary axis on the x-y plane is counterclockwise when viewed
against the z axis, then the machine data must be set to TRUE, otherwise to FALSE.
MD24810 $MC_TRACYL_ROT_SIGN_IS_PLUS_<t>=TRUE
In this case, "t" is substituted by the number of TRACYL transformations declared in the
transformation data blocks (t may not be greater than 2).
Switchable geometry axes
The PLC is informed when a geometry axis has been replaced using GEOAX( ) through the
optional output of an M code that can be set in machine data.
● MD22534 $MC_TRAFO_CHANGE_M_CODE
Number of the M code that is output at the VDI interface in the case of transformation
changeover.
Note
If this machine data is set to one of the values 0 to 6, 17, 30, then no M code is output.
Further information
Function Manual Basic Functions; Coordinate systems, axis types, axis configurations,
workpiece-related actual-value system, external zero offset
Position of tool zero
The position of the tool zero point in relation to the origin of the Cartesian coordinate system is
specified by machine data as described in the following paragraph.
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Function Manual, 06/2019, A5E47435470B AA
Transformations