Control Units For Interpolation Control - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

Control units for interpolation control

Interpolation control unit check
• The interpolation control units specified with the parameter block and the control units of the fixed parameter are checked.
If the interpolation control units specified with the parameter block differ from the control units of each axis fixed parameter
for the interpolation control, it shown below.
Interpolation control units in the parameter block
mm
Normal start There are axes whose control unit
set in the fixed parameter is [mm]
and [inch].
Unit mismatch Control units of the fixed parameter for all axes differ from the
(Warning (error interpolation control units specified with parameter block.
code: 093DH))
Interpolation unit combinations
• The combinations of each axis control units for interpolation control are shown in the table below.
mm
mm (1)
inch (2)
degree (3)
pulse (3)
(1): Same units
(2): Combination of [mm] and [inch]
(3): Unit mismatch
Same units: (1)
The position command is calculated with the setting address (travel value), positioning speed or electronic gear, the
positioning is executed.
If control units for one axis are "degree" at the circular interpolation control, use "degree" also for the other
axis.
Combination of [mm] and [inch]: (2)
• 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.
5 POSITIONING CONTROL
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5.1 Basics of Positioning Control
inch degree
There are axes
whose control
unit set in the
fixed parameter
is [degree].
inch degree pulse
(2) (3) (3)
(1) (3) (3)
(3) (1) (3)
(3) (3) (1)
Starting method
pulse
There are axes Positioning control starts by the interpolation control units of
whose control parameter block.
unit set in the
fixed parameter
is [pulse].
• If the control units of axes to be interpolation-controlled are
the same, control starts in the preset control unit.
• If the control units of axes to be interpolation-controlled are
different, control starts in the unit of highest priority as
indicated below.
[Priority: pulse > degree > inch > mm]
(Example)
If axis is set to 1000 [pulse] and 10.000 [inch], 10.000 [inch]
setting is considered to be 10000 [pulse].