Siemens SINUMERIK 840D sl Function Manual page 170

W1: Tool offset
2.10 Incrementally programmed compensation values
Figure 2-45
The reference to this auxiliary plane serves only to calculate the end position. Active frames are
not affected by this internal calculation.
Instead of MOVT= ... it is also possible to write MOVT=IC( ...) if it is to be plainly visible that
MOVT is to function incrementally. There is no functional difference between the two forms.
Supplementary conditions
The following supplementary conditions apply to programming with MOVT:
● It is independent of the existence of a toolholder with orientation capability. The direction of
the motion is dependent on the active plane. It runs in the direction of the vertical axes, i.e.,
with G17 in Z direction, with G18 in Y direction and with G19 in X direction. This applies both
where no toolholder with orientation capability is active and for the case of a toolholder with
orientation capability without rotary tool or with a rotary tool in its basic setting.
● MOVT acts similarly for active orientation transformation (345axis transformation).
● If in a block with MOVT the tool orientation is changed simultaneously (e.g., active 5axis
transformation by means of simultaneous interpolation of the rotary axes), the orientation at
the start of the block is decisive for the direction of movement of MOVT. The path of the tool
tip (TCP - Tool Center Point) is not affected by the change in orientation.
● Linear or spline interpolation (G0, G1, ASPLINE, BSPLINE, CSPLINE) must be active.
Otherwise, an alarm is produced. If a spline interpolation is active, the resultant path is
generally not a straight line, since the end point determined by MOVT is treated as if it had
been programmed explicitly with X, Y, Z.
● A block with MOVT must not contain any programming of geometry axes (alarm 14157).
170
Definition of the position for absolute programming of a motion in tool direction
Function Manual, 06/2019, A5E47435126B AA
Tools