Fagor 8070 BL - 3.2 Absolute (G90) or Incremental (G91) Coordinates

Programming manual.
CNC 8070
3.
COORDINATE SYSTEM
Absolute (G90) or incremental (G91) coordinates.
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(REF: 1709)
3.2 Absolute (G90) or incremental (G91) coordinates.
The coordinates of the various points may be defined in absolute coordinates (referred to
the active origin point) or incremental coordinates (referred to the current position). The type
of coordinates may be selected by program using the following functions:
G90 Programming in absolute coordinates.
G91 Programming in incremental coordinates.
Both functions may be programmed anywhere in the program; they do not have to go alone
in the block.
Operation
After executing one of these functions, the CNC assumes that programming mode for the
following blocks. If none of these functions is programmed, the CNC uses the work mode
selected by machine manufacturer [G.M.P. "ISYSTEM"].
Depending on the active work mode (G90/G91), the coordinates of the points are defined
as follows:
• When programming in absolute coordinates (G90), the coordinates of the point are
referred to the current origin of the coordinate system, usually the part zero.
• When programming in incremental coordinates (G91), the coordinates of the point are
referred to the current tool position. The preceding sign indicates the direction of the
movement.
Function properties
The G90 and G91 functions are modal and incompatible with each other.
On power-up, after an M02 or M30 and after an EMERGENCY or a RESET, the CNC
assumes function G90 or G91 as set by the machine manufacturer [G.M.P. "ISYSTEM"].
N10 G00 G71 G90 X0 Y0
N20 G01 X35 Y55 F450
N30 X75 Y25
N40 X0 Y0
N50 M30
Programming in absolute coordinates.
N10 G00 G71 G90 X0 Y0
N20 G01 G91 X35 Y55 F450
N30 X40 Y-30
N40 X-75 Y-25
N50 M30
Programming in incremental coordinates.