Mitsubishi Electric MELSEC iQ-R Series User Manual page 236

• Circular interpolation control with center point designation
When selecting "1: mcCenter" in the CircMode input, two configuration axes specified in CircAxes are used to carry out
positioning control in an arc path having the specified center point as a center point.
[Circular interpolation path]
The path in the absolute value circular interpolation control with center point designation can be set by the PathChoice input of
MCFB. The following table shows the setting value, setting description, arc center angle that can be controlled, and path of
PathChoice.
When the start point, end point, and center point are on one straight line, and when selecting "2: mcShortWay" or "3:
mcLongWay", a semicircle is drawn in CW direction.
When the start point is same as the end point, and when selecting "2: mcShortWay", an error occurs.
When the start point is same as the end point, and when selecting "3: mcLongWay", a perfect circle is drawn in CW direction.
Setting value Setting description
0: mcCW CW
1: mcCCW CCW
2: mcShortWay Short way
• When the start point, end point, and center point
are on one straight line, a semicircle is drawn in
CW direction.
• When the start point is same as the end point, an
error occurs.
3: mcLongWay Long way
• When the start point, end point, and center point
are on one straight line, a semicircle is drawn in
CW direction.
• When the start point is same as the end point, a
perfect circle is drawn in CW direction.
6 AXIS CONTROL FUNCTION
234
6.4 Multiple Axes Positioning Control
Arc center angle that Path
can be controlled
0 <   360
Start point
(current stop
position)
0 <   360
Start point
(current stop
position)
0 <   180
180    360
Positioning path
0° < θ ≤ 360°
End point
(positioning
address)
Center point
Center point
0° < θ ≤ 360 °
End point
(positioning
address)
Positioning path
End point
θ
Start
Center point
point
End point
Center
point
Start
point θ