Mitsubishi FX2N-10GM, Hardware / Programming Manual

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FX Series Positioning Controllers Operation, Maintenance and Inspection 8
8-2
8.1.4 Incremental/absolute drive method
To specify the travel (or rotation angle) of the machine, absolute drive and incremental drive
methods can be selected. Absolute drive method indicates the position from a reference point
and incremental drive method indicates the position by travel distance from the present position.
Absolute drive method
The distance from the reference point (zero point) is specified.
Program example
Ox00
cod00(DRV)
x1000;
cod00(DRV)
x2500;
cod00(DRV)
x1500;
m02(END)
In the example above, Point A is placed at "+1000" from the zero point.
Point B is placed at "+2500" from the zero point. When the machine returns from Point B to
Point C, it moves in the minus direction but the travel is indicated as "+1500".
A program example is given.
Incremental drive method
The distance of travel from the present position is specified.
Program example
Ox00
cod91(INC);
cod00(DRV)
x1000;
cod00(DRV)
x1500;
cod00(DRV)
x-1000;
m02(END)
In the example above, the operation equivalent to that explained in the absolute drive method
is indicated. Here, Point A is placed at "+1000" from the initial position.
Point B is placed at "+1500" (incremental travel) from Point A (reference point).
In the same way, Point C is placed at "-1000" from Point B (reference point).
Drive method specification
The absolute drive method can be selected by entering "cod90 (ABS)" in the positioning pro-
gram, and the incremental drive method can be selected by entering "cod91 (INC)". The abso-
lute drive method is automatically selected when nothing is specified (Refer to Section 5.6.15.).
0
+1000
A
+1500
C
+2500
B
0
Reference point
A
C
B
1000
1000
1500