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9 - 60 
MELSEC-Q
 
9   MAJOR POSITIONING CONTROL 
 
9.2.11 2-axis circular interpolation control with center point designation 
In "2-axis circular interpolation control" ("
Da.2
Control system" = ABS circular right, 
INC circular right, ABS circular left, INC circular left), two motors are used to carry out 
position control in an arc path having a designated center point, while carrying out 
interpolation for the axis directions set in each axis.  
(Refer to Section 9.1.6 "Interpolation control" for details on interpolation control.)  
 
The following table shows the rotation directions, arc center angles that can be 
controlled, and positioning paths for the different control systems.  
 
Control system 
Rotation direction 
Arc center angle that 
can be controlled 
Positioning path 
ABS circular right 
INC circular right  
Clockwise 
Positioning path
0° <    < 360°
Center point 
Start point 
(current stop
position)
End point
(positioning address) 
 
ABS circular left  
INC circular left  
Counterclockwise 
0
°
 < 
θ
 
 360
°
 
Center point
Positioning path
Start point 
(current stop
 position)
End point
(positioning address) 
0°<    < 360°