7. POSITIONING CONTROL
7 − 55
POINT
(1) Do not set the travel value to zero for fixed-pitch feed control.
The following results if the travel value is set to zero:
(a) If both axes are set to zero, the fixed-pitch feed ends with no feed
taking place.
(b) If the travel value is set to zero for one axis only, fixed-pitch feed
control will not occur at the normal positioning speed for the axis set
to a non-zero travel value.
[Program Example]
This program conducts fixed-pitch feed control using 2-axes linear interpolation
under the conditions below.
(1) System configuration
Fixed-pitch feed control using 2-axes linear interpolation of Axis 2 and Axis 3.
M M M M
A61P
A273UH
CPU
A278
LX
Axis
1
Axis
2
Axis
3
Axis
4
A61P
AX41
Start command (X000)
MR- -B
MR- -B MR- -B MR- -B
(2) Positioning conditions
The fixed-pitch feed control conditions are shown below.
Item Setting
Servo program number No. 310
Positioning speed 10000
Controlled axis Axis 2 Axis 3
Travel value 500000 300000
(a) Fixed-pitch feed control start command....... leading edge of X000
(OFF → ON)
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