Special Motion Commands; Approaching Coded Positions (Cac, Cic, Cdc, Cacp, Cacn); Spline Interpolation (Aspline, Bspline, Cspline, Bauto, Bnat, Btan, Eauto, Enat, Etan, Pw, Sd, Pl) - Siemens SINUMERIK 840D sl Programming Manual

Work preparation

3.7 Special motion commands

3.7 Special motion commands
3.7.1

Approaching coded positions (CAC, CIC, CDC, CACP, CACN)

Using the path commands to "Approach coded positions", it is possible to traverse linear and
rotary axes to fixed axis positions saved in the machine data table by specifying position
numbers.
Syntax
CAC(<n>)
CIC(<n>)
CACP(<n>)
CACN(<n>)
Meaning
CAC(<n>):
CIC(<n>):
CDC(<n>):
CACP(<n>):
CACN(<n>):
<n>:
Example: Approach coded positions of a positioning axis
Programming code
N10 FA[B]=300
N20 POS[B]=CAC(10)
N30 POS[B]=CIC(-4)
3.7.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN,
EAUTO, ENAT, ETAN, PW, SD, PL)
Randomly curved workpiece contours cannot be precisely defined in an analytic form. This is
the reason why these type of contours are approximated using a limited number of points along
curves, e.g. when digitizing surfaces. The points along the curve must be connected to define
a contour in order to generate the digitized surface of a workpiece. Spline interpolation permits
this.
592
Approach coded position from position number n
Starting from the actual position number, approach the coded position n position
locations before (+n) or back (–n)
Approach the position from position number n along the shortest path
(only for rotary axes)
Approach coded position from position number n in the positive direction
(only for rotary axes)
Approach coded position from position number n in the negative direction
(only for rotary axes)
Position number within the machine data table
Value range: 0, 1, ... (max. number of table locations - 1)
Comment
; Feedrate for positioning axis B
; Approach coded position from position number 10
; Approach coded position from "current position num-
ber" - 4
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming