Absolute/Incremental Dimensioning: G90, G91, Ac, Ic - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

The following plane and axis assignments are possible:
G function
G17
G18
G19
See the following illustration for planes and axes when drilling/milling:
Programming example
N10 G17 T... D... M...
N20 ... X... Y... Z...
8.2.3

Absolute/incremental dimensioning: G90, G91, AC, IC

Functionality
With the instructions G90/G91, the written positional data X, Y, Z... are evaluated as a coordinate point (G90) or as an axis
position to traverse to (G91). G90/G91 applies to all axes.
Irrespective of G90/G91, certain positional data can be specified for certain blocks in absolute/incremental dimensions using
AC/IC.
These instructions do not determine the path by which the end points are reached; this is provided by a G group (G0, G1,
G2 and G3.... For more information, refer to Sections "Linear interpolation (Page 69)" and "Circular interpolation
(Page 72)".).
Programming
G90
G91
X=AC(...)
X=IC(...)
52
Plane (abscissa/ordinate)
X/Y
Z/X
Y/Z
; X/Y plane selected
; tool length compensation (length1) in Z axis
; Absolute dimension data
; Incremental dimension data
; Absolute dimensioning for a certain axis (here: X axis), non-modal
; Incremental dimensioning for a certain axis (here: X axis), non-modal
Vertical axis on plane
(length compensation axis when drilling/milling)
Z
Y
X
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA1, 01/2014