Absolute Dimensions (G90, Ac) - Siemens SINUMERIK 840D sl Programming Manual

2.8.4.1

Absolute dimensions (G90, AC)

With absolute dimensions, the position specifications always refer to the zero point of the
currently valid coordinate system, i.e. the absolute position is programmed, on which the tool
is to traverse.
Modal absolute dimensions
Modal absolute dimensions are activated with the G90 command. Generally it applies to all
axes programmed in subsequent NC blocks.
Non-modal absolute dimensions
With preset incremental dimensions (G91), the AC command can be used to set non-modal
absolute dimensions for individual axes.
Note
Non-modal absolute dimensions (AC) are also possible for spindle positioning (SPOS, SPOSA)
and interpolation parameters (I, J, K).
Syntax
G90
<axis>=AC(<value>)
Meaning
G90:
AC:
<axis>:
<value>:
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Command for the activation of modal absolute dimensions
Command for the activation of non-modal absolute dimensions
Axis identifier of the axis to be traversed
Position setpoint of the axis to be traversed in absolute dimensions
Fundamentals
2.8 Geometry settings
149