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82
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[Circular
interpolation
with
acceleration/deceleration]
To
use
circular
interpolation
with
acceleration/deceleration,
you
have
to
enter
the
number
of
circular
interpolation
pulses
required
(circular
interpolation
step
numbers)
in
the
PRCI
register
for
the
control
axis.
To
calculate
the
number
of
pulses
required
for
circular
interpolation,
break
the
area
covered
by
the
X
and
Y
axes
into
8
(0
to
7)
sections,
using
the
center
coordinate
of
the
circular
interpolation
as
the
center
point.
See
the
figure
below.
The
output
pulse
status
of
each
axis
in
each
area
is
as
follows
Area
0
X
axis
output
pulse
Output
according
to
the
interpolation
calculation
result
Always
output
Y
axis
output
pulse
Always
output
1
Output
according
to
the
interpolation
calculation
result
Output
according
to
the
interpolation
calculation
result
Always
output
2
Always
output
3
Output
according
to
the
interpolation
calculation
result
Output
according
to
the
interpolation
calculation
result
Always
output
4
Always
output
5
Output
according
to
the
interpolation
calculation
result
Output
according
to
the
interpolation
calculation
result
Always
output
6
Always
output
7
Output
according
to
the
interpolation
calculation
result
The
table
above
shows
the
PCL
output
pulses
for
either
of
the
axes
in
each
area.
Therefore,
the
number
of
pulses
required
for
circular
interpolation
(the
number
of
circular
interpolation
steps)
is
equal
to
the
number
of
pulses
to
move
around
this
side
of
a
square
that
is
surrounded
by
the
circle
used
for
the
circular
interpolation.
For
example,
to
draw
a
90
o
arc
with
radius
"a,"
the
number
of
pulses
required
for
circular
interpolation
will
be
(a
)
x
2.
Enter
this
value
in
the
PRCI
register.
To
obtain
the
number
of
steps
for
any
start
and
end
points,
follow
the
procedure
below.
1)
First,
determine
the
area
that
the
start
point
belongs
to
(area
0
to
7).
Then,
draw
a
horizontal
(vertical)
line
to
find
the
contact
point
with
the
square
inside
the
circle.
2)
Next,
determine
the
area
that
the
end
point
belongs
to
(area
0
to
7).
Then,
draw
a
vertical
(horizontal)
line
to
find
the
contact
point
with
the
square
inside
the
circle.
3)
Find
the
distance
between
the
two
contact
points
on
the
square
(from
1)
and
2)
above)
and
enter
this
value
in
the
PRIC
register.