Siemens SINUMERIK 808D ADVANCED - Absolute;Incremental Dimensioning: G90, G91, AC, IC

Programming and Operating Manual (Milling)
52 6FC5398-4DP10-0BA1, 01/2014
The following plane and axis assignments are possible:
G function
Plane (abscissa/ordinate)
Vertical axis on plane
(length compensation axis when drilling/milling)
G17
X/Y Z
G18
Z/X Y
G19
Y/Z X
See the following illustration for planes and axes when drilling/milling:
Programming example
N10 G17 T... D... M...
; X/Y plane selected
N20 ... X... Y... Z...
; tool length compensation (length1) in Z axis
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 ; Absolute dimension data
G91 ; Incremental dimension data
X=AC(...) ; Absolute dimensioning for a certain axis (here: X axis), non-modal
X=IC(...) ; Incremental dimensioning for a certain axis (here: X axis), non-modal