Toolholder - Siemens SINUMERIK 828D Function Manual

K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
Behavior
Upon activation of the external zero offset the traversing movements of all axes, except command and PLC axes,
are stopped immediately and the advance is reorganized. The rough offset of the current system frame and of
the system frame in data management is set to the value of the axial system variable $AA_ETRANS[<axis>].
Thereafter, the offset is traversed first and then the interrupted movement is continued.
Behavior for incremental dimension
In case of active incremental dimension G91 and machine data:
MD42440 $MC_FRAME_OFFSET_INCR_PROG (zero offset in frames) = 0
traversing the offset is done in the scope of the external zero offset via system frame, despite opposite
configuring of the machine data, with the approach block, although it is specified by a frame.
Note
The external zero offset always acts absolutely.
10.5.8.3

Toolholder

Translations
With kinematics of type P and M the selection of a toolholder activates an additive frame (table offset of the
orientational toolholder), which takes into account the zero point offset as a result of the rotation of the table. The
zero offset is entered in a system frame ($P_PARTFR). In this case the translatory component of this frame is
overwritten. Other contents of this frame remain intact.
To be able to use this system frame, the bit 2 must be set in the machine data:
MD28082 $MC_MM_SYSTEM_FRAME_MASK
.
Alternatively, there is the option to enter this offset into the basic frame identified by machine data
MD20184 $MC_TOCARR_BASE_FRAME_NUMBER
.
This option is available in the interests of compatibility with older software versions.
It is not recommended for use with new systems.
A frame offset as a result of a toolholder change becomes effective immediately on selection of TCARR=.... A
change in the tool length, on the other hand, only becomes effective immediately if a tool is active.
A frame rotation does not take place on activation and a rotation which is already active is not changed. As in
case T (only the tool can be rotated), the position of the rotary axes used for the calculation is dependent on the
G code TCOFR / TCOABS and determined from the rotation component of an active frame or from the entries
$TC_CARRn. Activation of a frame changes the position in the workpiece coordinate system accordingly, without
compensating movement by the machine itself.
The ratios are shown in the figure below:
782
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions