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3-axis helical interpolation control with sub point designation (INC helical sub)
■Operation chart
In the incremental system and 3-axis helical interpolation control with sub point designation, the positioning is performed from
the current stop position (X0, Y0, Z0) to the position (X1, Y1, Z1) for the movement amount set in "[Da.6] Positioning address/
movement amount". As the positioning to the commanded position, the linear interpolation with the other linear interpolation
axes is performed and the positioning target is rotated helically for the number of pitches set in "[Da.10] M code/Condition
data No./Number of LOOP to LEND repetitions/Number of pitches" of the linear interpolation axis while the circular
interpolation through the sub point address (sub point address) set in "[Da.7] Arc address" is performed. The movement
direction is determined by the sign of the movement amount.
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 the sub point address (arc address) calculated from the movement amount to
the sub point, and a straight line between the sub point address (arc address) and the end point address (positioning address)
calculated from the movement amount to the end point.
Operation chart
Linear
movement
amount
Z axis
Y axis
X axis
Arc sub point
■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 designation method"
• When the value out of the range of "0 to 999" is set in the number of pitches ("[Da.10] M code/Condition data No./Number
of LOOP to LEND repetitions/Number of pitches")
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.
Error cause
When the radius exceeds 536870912 (= 2
the circular interpolation control is possible is 536870912 (= 2
When the sub point address is out of the range of -2147483648 (-2
31
2147483647 (2
-1)
When the end point address is out of the range of -2147483648 (-2
31
2147483647 (2
-1)
When the center point address is out of the range of -2147483648 (-2
31
2147483647 (2
-1)
Start point address = End point address
Start point address = Sub point address
End point address = Sub point address
When the start point address, sub point address, and end point address are
on a straight line
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)
29
) (The maximum radius for which
29
).)
31
) to
31
) to
31
) to
Top view of the circular interpolation
Arc sub point
Movement
Movement
amount
amount
to the
end point
to the sub point
Movement amount
to the sub point
Error code
The error "Outside radius range" (error code: 1A32H) occurs at the start of the
positioning.
The error "Sub point setting error" (error code: 1A2AH) occurs at the start of
the positioning.
The error "End point setting error" (error code: 1A2CH) occurs at the start of
the positioning.
The error "Sub point setting error" (error code: 1A37H) occurs at the start of
the positioning.
The error "End point setting error" (error code: 1A2BH)
The error "Sub point setting error" (error code: 1A27H)
The error "Sub point setting error" (error code: 1A28H)
The error "Sub point setting error" (error code: 1A29H)
3 MAJOR POSITIONING CONTROL
Circular interpolation control
end point (X1, Y1)
Center point
Circular interpolation control
start point (X0, Y0)
3.2 Setting the Positioning Data
3
99
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Table of Contents
Troubleshooting
Also See for Mitsubishi Electric RD77MS2
Mitsubishi Electric RD77MS2 User Manual
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