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5 POSITIONING CONTROL
5.9 Helical Interpolation Control
Circular interpolation specified method by helical interpolation
The following method of circular interpolation is possible for the helical interpolation.
The specified method of circular interpolation connected start point and end point at the seeing on the plane for which
performs circular interpolation are as follows.
Precautions
• When the travel value of linear axis is "0" is set, it can be controlled.
• Units for linear axis have not restrictions.
• Circular interpolation axis has the following restrictions.
• Specified the speed which executes speed change by CHGV instruction during helical interpolation operation with the
vector speed of circular interpolation axis 2. If speed change is requested by specifying negative speed by CHGV
instruction during helical interpolation operation, deceleration starts from the time and it is possible to return to reverse
direction at the deceleration completion.
• If start point = end point, number of pitches = 1 and travel value of linear axis = 0, at the only central point-specified circular
interpolation, full circle can be drawn. When the address of "start point = end point" is set at the radius-specified helical
interpolation or auxiliary point-specified helical interpolation, a minor error (error code: 1A2BH) occurs at the start and
cannot be start.
• When the control unit is [degree] and the stroke limit is invalid, if the helical interpolation control is executed using absolute
data method, positioning in near direction to specified address based on the current value.
• Allowable error range for circular interpolation can be set.
Servo instruction
Positioning method
Circular interpolation specified method
ABH
Absolute
Radius-specified method less than CW180
INH Incremental
ABH
Absolute
Radius-specified method less than CCW180
INH Incremental
ABH Absolute
Radius-specified
method
CW180
or more.
INH Incremental
ABH Absolute
Radius-specified
method
CCW180
or more.
INH Incremental
ABH
Absolute
Central point-specified method CW
INH Incremental
ABH
Absolute
Central point- specified method CCW
INH Incremental
ABH Absolute
Auxiliary
point-specified
method
INH Incremental
Condition
Operation
Number of pitches is 0
Same control as normal circular interpolation control. (Allowable error range for circular interpolation can be set.)
Number of pitches is not 0
Linear interpolation to linear axis does not executed, circle for the number of pitches is drawn on the circle plane.
(Allowable error range for circular interpolation can be set.)
• When the unit of one axis is [degree] axis (with stroke range), set another axis also as [degree] axis (without stroke range).
• The axis of [degree] unit as without stroke range cannot be set.
Содержание MELSEC iQ-R16MTCPU
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