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Writing Traversing Programs
Dimensions G90,
The traversing movement at a specific point can be described by
G91
You can switch back and forth at will between reference-measure and incre-
mental input.
The status at startup is reference-measure programming G90.
G90 and G91 are modal.
Absolute
Absolute dimensioning is the method used to specify dimensions that gener-
Dimensioning G90
ally refer to the coordinate system.
Fig. 10-1 Reference-Measure Input G90
Note
To ensure precise reproduction of the program, the first block should contain
reference-measure programming.
Incremental
Incremental dimensioning is the method used to specify incremental dimen-
Dimensioning G91
sions that refer to the last actual position.
Fig. 10-2 Incremental Input G91
10-8
Reference-measure input (absolute measure input) G90 or
Incremental input (relative measure input) G91
/ N G1 G2 G3
90
Programmed
position
0
10
20
/ N G1 G2 G3
91
Programmed
position
0
10
20
X/t
F
M1 M2 M3 D
20
100
Actual position
30
40
50
mm
X/t
F
M1 M2 M3 D
–30
100
Actual position
30
40
50
mm
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
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