IAI ssel - Page 217

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Part 2 Programs
 ARCC (Move along arc via specification of center position and center angle (arc interpolation))
Command, declaration
Extension condition
(LD, A, O, AB, OB)
Input condition
(I/O, flag)
Command,
declaration
Operand 1 Operand 2
Output
(Output, flag)
Optional Optional ARCC
Center
position
number
Center
angle
PE
[Function] Move along an arc originating from the current position by keeping a specified radius from the
center position, via arc interpolation.
Specify the center position in operand 1, and the center angle formed by the position origin
and end position in operand 2. The center angle is set in a range from –3600 to 3600 degrees
(±10 revolutions). A positive value indicates CCW (counterclockwise-direction) movement,
while a negative value indicates CW (clockwise-direction) movement (setting unit: degree).
(Note) The rotating direction of the actual operation locus may vary from the specified direction
depending on how each axis is installed, how the two axes are combined, and so on. Perform
test operation to check the rotating direction.
The center angle is set in degrees and may include up to three decimal places.
The speed and acceleration will take valid values based on the following priorities:
Priority Speed Acceleration (deceleration)
1
Setting value in the position
data specified in operand 1
Setting value in the position data specified in
operand 1
2
Setting value by VEL
command
Setting value by ACC (DCL) command
3
Default acceleration in all-axis parameter No. 11
(Default deceleration in all-axis parameter No. 12)
If speed is not set, a “C88 speed specification error” will generate.
If acceleration/deceleration is not valid, a “C89 acceleration/deceleration specification error”
will generate.
(Note) This command is valid on arbitrary orthogonal planes. (Axis 2 may be selected automatically
prior to axis 1 in accordance with the position data.)
[Example] VEL 100 Set the speed to 100 mm/s.
ARCC 100 120 Move along an arc from the position origin for a center angle
of 120 degrees around position No. 100 being the center
(CCW direction).
Position origin
Center angle
Center position