Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 9 MAJOR POSITIONING CONTROL
9
9.
2 Set
ting t
he Pos
itioning
D
at
a
Positioning of a true circle with a radius of the distance from the start point address to the arc center point can
be carried out by setting the end point address (positioning address) of the circular interpolation axis to the
same address as the start point address.
(b) Restrictions
3-axis helical interpolation control cannot be set in the following cases.
• When "degree" is set in "[Pr.1] Unit setting" for 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. ("mm" and "inch" combinations are possible.)
• When the "reference axis speed" is set in "[Pr.20] Interpolation speed designation method" or "[Da.29]
Interpolation speed designation method".
An error will occur and the positioning will not start in the following cases. The machine will immediately stop if
the error is detected during positioning control.
Operation chart Circular interpolation plane
Error cause Error code
When the radius exceeds "536870912 (= 2
29
)". (The maximum radius for
which circular interpolation control is possible is "536870912 (= 2
29
)".)
An error "Outside radius range" (error code: 544) will occur at positioning start.
Start point address = Center point address Error "Center point setting error" (error code: 527)
End point address = Center point address Error "Center point setting error" (error code: 527)
Center point address is outside the range of

2147483648 (

2
31
) to
2147483647 (2
31

1).
Error "Center point setting error" (error code: 527)
Z axis
Y axis
X axis
Circular interpolation control
end point (X1, Y1)
Linear control end point (Z1)
Arc center point
Number of pitch
Linear movement
amount
Circular interpolation control
start point (X0, Y0)
Linear control start point (Z0)
Center point
Radius
Circular interpolation control
start point (X0, Y0)
Circular interpolation control
end point (X1, Y1)