9 MAJOR POSITIONING CONTROL

9.1.6 Interpolation control

Meaning of interpolation control

MELSEC-Q

In "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”, and "2-axis circular interpolation control", control is carried out so that linear and arc paths are drawn using a motor set in two to four axis directions. This kind of control is called "interpolation control".

In interpolation control, the axis in which the control system is set is defined as the "reference axis", and the other axis is defined as the "interpolation axis".

The QD75 controls the "reference axis" following the positioning data set in the "reference axis", and controls the "interpolation axis" corresponding to the reference axis control so that a linear or arc path is drawn.

The following table shows the reference axis and interpolation axis combinations.

Axis definition

Axis set to interpolation

control in " Da.2 Control method"

Reference axis

Interpolation axis

2-axis linear interpolation control, "2-axis fixed-feed

Any of axes 1, 2,

"Axes to be

control, 2-axis circular interpolation control, 2-axis

interpolated" set in

3, and 4

speed control

reference axis

 

 

 

 

 

Axis 1

Axis 2, Axis 3

 

 

 

3-axis linear interpolation control, "3-axis fixed-feed

Axis 2

Axis 3, Axis 4

control, 3-axis speed control

Axis 3

Axis 4, Axis 1

 

Axis 4

Axis 1, Axis 2

 

Axis 1

Axis 2, Axis 3, Axis 4

 

 

 

4-axis linear interpolation control, "4-axis fixed-feed

Axis 2

Axis 3, Axis 4, Axis 1

control, 4-axis speed control

Axis 3

Axis 4, Axis 1, Axis 2

 

Axis 4

Axis 1, Axis 2, Axis 3

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Mitsubishi Electronics QD75D Interpolation control, Meaning of interpolation control, Control, 4-axis speed control Axis