Interpolation Control - Mitsubishi Electric MELSEC iQ-R-RD75P4 User Manual

Interpolation control

Meaning of the interpolation control
For 2-axis linear interpolation control, 3-axis linear interpolation control, 4-axis linear interpolation control, 2-axis fixed-feed
control, 3-axis fixed-feed control, 4-axis fixed-feed control, 2-axis speed control, 3-axis speed control, 4-axis speed control, 2-
axis circular interpolation control, and 3-axis helical interpolation control, each control is performed so that linear and arc
paths are drawn using motors set in the directions of two to four axes. This type of control is called interpolation control.
In the interpolation control, the axis in which the control method is set is defined as the reference axis and the other axes are
defined as the interpolation axes. The RD75 controls the reference axis following the positioning data set in the reference
axis, and controls of the interpolation axes corresponding to the control of the reference axis so that a linear or arc path is
drawn.
The following table shows the combinations of the reference axis and interpolation axes.
Interpolation control set in [Da.2] Control
method
2-axis linear interpolation control, 2-axis fixed-feed
control, 2-axis circular interpolation control, and 2-axis
speed control
3-axis linear interpolation control, 3-axis fixed-feed
control, and 3-axis speed control
4-axis linear interpolation control, 4-axis fixed-feed
control, and 4-axis speed control
The combinations of axes available for the 3-axis helical interpolation control are the same as the ones for the 3-axis linear
interpolation control, 3-axis fixed-feed control, and 3-axis speed control. However, the circular interpolation axis can be
specified in [Da.5] Axis to be interpolated of the reference axis. The following table shows the combinations of the reference
axis, circular interpolation axis, and linear interpolation axis for the 3-axis helical interpolation control.
Interpolation control set in [Da.2]
Control method
3-axis helical interpolation control
*1 Specified in [Da.5] Axis to be interpolated of the reference axis.
*2 An axis that is not specified in [Da.5] Axis to be interpolated of the reference axis is automatically assigned.
Reference axis
Any of Axis 1 to 4
Axis 1
Axis 2
Axis 3
Axis 4
Axis 1
Axis 2
Axis 3
Axis 4
Reference axis
Axis 1
Axis 2
Axis 3
Axis 4
Interpolation axis
Depends on the axis to be interpolated set in the
reference axis
Axis 2, Axis 3
Axis 3, Axis 4
Axis 4, Axis 1
Axis 1, Axis 2
Axis 2, Axis 3, Axis 4
Axis 3, Axis 4, Axis 1
Axis 4, Axis 1, Axis 2
Axis 1, Axis 2, Axis 3
*1
Circular interpolation axis
Axis 2
Axis 3
Axis 3
Axis 4
Axis 4
Axis 1
Axis 1
Axis 2
3 MAJOR POSITIONING CONTROL
3.1 Overview of the Major Positioning Controls
*2
Linear interpolation axis
Axis 3
Axis 2
Axis 4
Axis 3
Axis 1
Axis 4
Axis 2
Axis 1
3
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