5238-E P-22
SECTION 2 COORDINATE SYSTEMS AND COMMANDS
[Supplement]
LE33013R0300400090001
2-4.
Absolute and Incremental Commands (G90, G91)
The amount of axis movement can be expressed by either absolute commands or incremental
commands.
(1) Absolute commands
Designated with G90
Commanded values are coordinate values in the program coordinate system.
When the control is reset, it is in the G90 mode.
(2) Incremental commands
Designated with G91
Commanded values are the travel from the actual position to the target position.
Example:
(Positioning from point (1) to point (2)):
LE33013R0300400100001
[Supplement]
•
Feedrate of 0.23456 mm/rev.
F234.56
For F words, numerical data smaller than the selected unit system is effective if it consists of up to
eight digits.
1) In incremental programming, the X word should be expressed as a diameter.
2) It is not permissible to specify both G90 and G91 in the same block.
F1.2345678
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
Acceptable
F100.000001
⋅⋅⋅⋅⋅⋅⋅⋅⋅
Alarm (9 digits)
X100
Z50
X
100
25
X50
Z150
Absolute
Incremental
G00 X50 Z150 (1)
X100 Z50 (2)
*G91 X50 Z-100 (2)
*Designate dimensional differences between points (2) and (1).
G00 X50 Z150 (1)
(2)
(1)
