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6 MOTION PROGRAMS FOR POSITIONING CONTROL
6.13.28 G91 Incremental value command
Code G91
Function Incremental value command
The coordinates command is set as an incremental value command.
Format
9
Locating position
1Xx ;GYyZz
[Explanation]
(1) In the incremental value command mode, the axes travel the distance of the
specified relative value from the start point (0) of the current position.
The positioning command set after execution of this command operates with the
incremental value from the current position.
(2) As this command is modal instruction, it is valid until the absolute value command
mode (G90) is commanded.
(3) The absolute value command mode is selected at a Motion program start.
[Example] G91 X100. Y100. ;
Y
X
50
50
100 150
100
150
Current position (50, 50)
(150, 150)
Y
Current position (80, 20)
(180, 120)
Current position coordinates of X50, Y50
50 100 150
50
100
150
X
200
Current position coordinates of X80, Y20
(Unit: mm)
(4) Positioning data can be set by direct setting (numerical value) and indirect setting
(variable : #
).