Circular Interpolation Operation; Circular Interpolation [Center Coordinate Specification] - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
9.11

Circular Interpolation Operation

The circular interpolation operation is a positioning procedure, available only in the table operation.
The circular interpolation operation has the center coordinate specification/radius specification format.
For details on controlling by table operation, and changing the operation speed, refer to the following section.
→ For details on the related parameters, control data, and monitor data, refer to Subsection 9.12

9.11.1 Circular interpolation [center coordinate specification]

The work piece moves from the start point to the target address, following the circular arc locus around the
specified center coordinate.
1. Operation
Target address 1 (X,Y axis)
CW
(Clockwise)
Center (i,j)
START point
1) Set table information, X-axis speed, X/Y axis position (address) information and center coordinate in the
XY table information.
2) When turning the X-axis START command ON at the table operation start number with the specified
circular interpolation (center, CW direction) / (center, CCW direction), the work piece moves to the target
position at the specified speed, following the circle's center coordinate.
3) The work piece stops at the XY coodinate in target address 1, and the operation ends, turning the
positioning completion signal ON.
Note
• The center coordinate is always handled as a relative address from the start point.
• When setting the same address for the start and target points, the work piece moves in a perfect circle.
The center coordinate specification is available in the perfect circle operation.
• During continuous pass operation
If the circular path is too short and the travel time from the start point to the target point is shorter than the
interpolation time constant, the operation temporarily stops and shifts to the next interpolation operation.
• When interpolation operation is continued in table operation, it becomes a continuous pass operation.
2. Operation information
Set a circular interpolation operation ("center, CW direction" or "center, CCW direction") and an absolute/
relative address in the operation information.
→ For details on the table operation, refer to Chapter 10
→ For details on the operation speed change, refer to Section 7.5
→ For details on torque limit, refer to Subsection 7.6.3
→ For details on STOP command, refer to Section 7.4
→ For details on the radius specification, refer to Subsection 9.11.2
Interpolation
time constant
Speed
CCW
(Counterclockwise)
ON
OFF
START command
ON
Positioning completion
OFF
→ For details on the continuous pass operation, refer to Section 10.10
9 Positioning Control
9.11 Circular Interpolation Operation
Interpolation
time constant
Maximum speed
Vector speed
(operation speed 1
of X axis)
Target address
(X,Y axis)
1
2
3
4
5
Time
6
ON
7
8
9
10
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