Defining The Input Modes Of The Coordinate Values; Absolute/Incremental Dimensioning (G90, G91) - Siemens SINUMERIK 808D Programming And Operating Manual

and 3D rotation, if no angle is programmed, the angle from the setting data 42150 $SC_DEFAULT_ROT_FACTOR_R is
active.
If a vector is programmed with the length 0 (I0, Y0, K0), the Alarm 12560 "Programmed value outside the permissible limits"
is triggered.
Two rotations can be switched one after the other with G68. If so far no G68 is active in a block containing G68, the rotation
is written to the second ISO system frame. If G68 is already active, the rotation is written to the third ISO system frame. Thus,
both rotations follow one another.
The 3D rotation is ended with G69. If two rotations are active, both are deselected with G69. G69 must not be alone in the
block.
4.3.2

Defining the input modes of the coordinate values

4.3.2.1

Absolute/incremental dimensioning (G90, G91)

Whether the dimensions after an axis address should be absolute or relative (incremental) is specified with these G
commands.
Properties of G90, G91
G command
G90
G91
● G90 and G91 are modal G functions of the G group 03. If G90 and G91 are programmed in the same block, the last G
function in the block is effective.
● The closed position of G90 or G91 is set in machine data MD20154 $MC_EXTERN_GCODE_RESET_VALUES[2].
Format
● The programmed values are interpreted as absolute axis positions for all axis positions programmed according to G90,
e.g. X, Y, Z.
● The programmed values are interpreted as incremental axis positions for all axis positions programmed according to G91,
e.g. X, Y, Z.
Absolute and incremental dimensioning (G90, G91):
106
Function
Absolute dimensioning
Incremental dimensioning
G group
03
03
Programming and Operating Manual (ISO Turning/Milling)
01/2017