Toolholder - Siemens SINUMERIK 840D sl Function Manual
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K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
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 orientable toolholder) which takes into account the work offset as a result
of the rotation of the table. The work offset is entered in the system frame $P_PARTFR. In this
case the translatory component of this frame is overwritten. The other frame components are
retained.
The system frame $P_PARTFR must be enabled via the following machine data:
MD28082 $MC_MM_SYSTEM_FRAME_MASK, bit 2 = 1 (system frame for TCARR and
PAROT)
Note
Alternatively, the offset can also parameterized via machine data to record the table offset:
MD20184 $MC_TOCARR_BASE_FRAME_NUMBER = <number of the basic frame>
This option is only for compatibility reasons to older software versions. You are strongly
recommended not to use this procedure any longer.
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 is not executed with the activation, or 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 command TCOFR/TCOABS and determined from the rotation
component of an active frame or from the $TC_CARR entries. Activation of a frame changes
the position in the workpiece coordinate system accordingly, without compensating motion by
the machine itself.
The ratios are shown in the figure below:
770
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions
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