RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
233
Normal
List Command
arc_abs_3d
Function moves the laser focus at marking speed from the current position spirally around an axis
parallel to the Z axis. The x and y components thereby characterize an arc with the
specified angle around the specified axis, while the z component characterizes a linear
motion from the current position to the specified end point. The position of the spiral axis
and the z end coordinate are specifiable as absolute coordinate values.
Restriction If the 3D option is not enabled or no 3D correction table has been assigned (see
select_cor_table), then the command will have the same effect as arc_abs.
Call
arc_abs_3d( X, Y, Z, Angle )
Parameters
X, Y
Position of the spiral axis (parallel to the Z axis) as absolute coordinates in bits
(signed 32-bit values);
allowed range: [–8388608 … 8388607]; out-of-range values will be edge-
clipped. The complete value range [–8388608 … 8388607] is only usable as
a virtual image field e.g. for (enabled) Processing-on-the-fly applications. The
current coordinates will be clipped to [–524288 … 524287] (real image field
size) during runtime directly prior to use of the correction table.
Z
absolute Z end coordinate in bits as signed 32-bit values;
allowed range: [–32768 … 32767];
(an out-of-range value will be edge-clipped).
Angle
arc angle in ° as a 64-bit IEEE floating point value
(positive angle values correspond to clockwise angles);
allowed range: [–3600.0° … +3600.0°] (±10 full circles);
an out-of-range value will be edge-clipped.
Comments • Except for the additional motion in the third dimension, this command functions simi-
larly to the arc_abs command (see the comments there).
• The X and Y axes can be controlled with 20-bit resolution, the Z axis with 16-bit resolu-
tion. The RTC
®
5 (in RTC
®
5 mode as well as in RTC
®
4 compatibility mode) automatically
upscales Z coordinate values internally to 20-bit values, so that the three dimensions of
space can be handled equivalently in terms of the supplied mark speed value.
• During calculation of the Z output value to the scan system, any previously defined
offset to the Z coordinate and focal length is taken into account (see page 126).
• The z motion isn’t taken into account during calculation of the number of microsteps.
RTC
®
4
RTC
®
5 new command
In RTC
®
4 compatibility mode, the RTC
®
5 multiplies the values specified for
X
and
Y
by 16
(the permissible range of values is correspondingly reduced). The value range for
Z
is
identical for the RTC
®
5 and RTC
®
4.
Version info Available beginning with version DLL 517, OUT 516, RBF 512
References arc_abs, arc_rel_3d
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