Owner's manual

Coordinate Control
Chapter 13
13-12
Important: Any axis word in a block with plane select G-codes (G17,
G18, G19) causes axis motion on that axis. If no value is specified with
that axis word, the control assumes a value of zero or generates an error
depending on how your system is AMPed.
There are two methods for programming axis positioning commands,
absolute positioning and incremental positioning.
In the a bsolute mode, coordinates are referenced from the zero point of the
active coordinate system. Absolute mode is established by programming a
G90.
G90X40.Z20.;
In the a bove block the control will move the axes to a position X40, Z20 as
referenced on the active coordinate system.
G90 is a modal G code and remains active until cancelled by a G91.
In the incremental mode, coordinates are referenced from the current axis
position. Incremental mode is established by programming a G91.
G91X40.Z20.;
In the a bove block the control will move the cutting tool a distance of 40
units on the X axis and 20 units on the Y axis away from the current axis
position.
G91 is a modal G code and remains active until cancelled by a G90.
13.3
Absolute/Incremental Modes
(G90,G91)