Mitsubishi Electric MELSEC iQ-R Series User Manual page 62

Limits to interpolation control
There are limits to the interpolation control that can be executed and speed ([Pr.20] Interpolation speed designation method)
that can be set, depending on "[Pr.1] Unit setting" of the reference axis and interpolation axis. (For example, 2-axis circular
interpolation control cannot be executed if the reference axis and interpolation axis units differ.)
The following table shows the interpolation control and speed designation limits.
: Setting possible, : Setting not possible
Interpolation control set in
"[Da.2] Control method"
Linear 2 (ABS, INC)
Fixed-feed 2
Circular sub (ABS, INC)
Circular right (ABS, INC)
Circular left (ABS, INC)
Linear 3 (ABS, INC)
Fixed-feed 3
Linear 4 (ABS, INC)
Fixed-feed 4
2 to 4-axis speed control
Helical sub (ABS, INC)
Helical right (ABS, INC)
Helical left (ABS, INC)
*1 "mm" and "inch" unit mix possible.
When "mm" and "inch" are mixed, convert as follows for the positioning.
If interpolation control units are "mm", positioning is controlled by calculating position commands from the address, travel value,
positioning speed and electronic gear, which have been converted to "mm" using the formula: inch setting value  25.4 = mm setting
value.
If interpolation control units are "inch", positioning is controlled by calculating position commands from the address, travel value,
positioning speed and electronic gear, which have been converted to "inch" using the formula: mm setting value/25.4 = inch setting
value.
*2 "degree" setting not possible.
The error "Circular interpolation not possible" (error code: 1A9FH) will occur and the positioning control does not start if 2-axis circular
interpolation control and 3-axis helical interpolation control is set when the unit is "degree".
The machine will carry out a deceleration stop if "degree" is set during positioning control.
*3 The unit set in the reference axis will be used for the speed unit during control if the units differ or if "mm" and "inch" are combined.
*4 Only linear interpolation axis can use a unit different from that of the reference axis.
Axis operation status during interpolation control
"Interpolation" will be stored in "[Md.26] Axis operation status" during interpolation control. "Standby" will be stored when the
interpolation operation is terminated. Both the reference axis and interpolation axis will carry out a deceleration stop if an error
occurs during control, and "Error" will be stored in the operation status.
3 MAJOR POSITIONING CONTROL
60
3.1 Outline of Major Positioning Controls
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[Pr.20] Interpolation speed
designation method
Composite speed
Reference axis speed
Composite speed
Reference axis speed
Composite speed
Reference axis speed
Composite speed
Reference axis speed
Composite speed
Reference axis speed
Composite speed
Reference axis speed
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*1
[Pr.1] Unit setting
Reference axis and
interpolation axis units are the
same, or a combination of
*3
"mm" and "inch"


*2








*2


Reference axis and
*3
interpolation axis units differ










*4

