Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

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3 MAJOR POSITIONING CONTROL
3.2 Positioning Data Setting
111
3
3-axis helical interpolation control with sub point specified (ABS helical sub)
■
Operation chart
In this control, the positioning is performed from the current stop position (X0, Y0, Z0) to the position indicated with the arc end
point address (X1 and Y1) and the line axis end point address (Z1) set in [Da.6] Positioning address/movement amount. As
the positioning to the commanded position, the linear interpolation with the other line axes is performed and the positioning
target is rotated helically for the number of pitches set in [Da.10] M code of the line axis while the circular interpolation through
the sub point address (sub point address) set in [Da.7] Arc address is performed.
The resulting path is an arc whose center is the intersection point of the perpendicular bisectors of a straight line between the
start point address (current stop position) and sub point address (arc address) and a straight line between the sub point
address (arc address) and end point address (positioning address).
■
Restrictions
In the following cases, the 3-axis helical interpolation control cannot be set.
• When Degree is set in [Pr.1] Unit setting of the reference axis and circular interpolation axis
• When the units set in [Pr.1] Unit setting are different between the reference axis and circular interpolation axis (The
combination of mm and inch is possible.)
• When Reference axis speed is set in [Pr.20] Interpolation speed specification method
In the following case, an error occurs and the positioning will not start. During the positioning control, the operation stops
immediately at the detection of the error.
Operation chart Top view of the circular interpolation
Error cause Error code
When the radius exceeds 536870912 (= 2
29
) (The maximum radius for which
the circular interpolation control is possible is 536870912 (= 2
29
).)
Outside radius range (Error code: 1A32H) occurs at the start of the
positioning.
When the center point address is out of the range of -2147483648 (-2
31
) to
2147483647 (2
31
-1)
Sub point setting error (Error code: 1A37H) occurs at the start of the
positioning.
Start point address = End point address End point setting error (Error code: 1A2BH)
Start point address = Sub point address Sub point setting error (Error code: 1A27H)
End point address = Sub point address Sub point setting error (Error code: 1A28H)
When the start point address, sub point address, and end point address are
on a straight line Sub point setting error (Error code: 1A29H)
Linear
movement
amount
Z axis
Y axis
X axis
Arc sub point
Circular interpolation control
end point (X1, Y1)
Linear control end point (Z1)
Number of pitch
Circular interpolation control
start point (X0, Y0)
Linear control start point (Z0)
Arc sub
point
Circular interpolation
control end point (X1, Y1)
Center point
Circular interpolation
control start point (X0, Y0)