YASKAWA yasnac i80m

2.6
REFERENCE
POINT
RETURN
(Cont’d)
Reference
Point Return
Check
(G27)
(1)
This
function
checks whether
a
part
program
which is
created
to
return
to
the
reference
point
after
starting
from
the machine
reference
point,
correctly
returns to
the
reference
point.
2.6.2
(2)
I.G27
X
Y
Z
(*«
0
When
this
command is
given,
the
machine is
positioned
at
the
instructed
point
simultaneously
for
three
axes
(ÿsimultaneously
for
five
axes)
by
rapid
feed,
then
it
is
checked
whether
that
position
is
the
reference
point.
However,
for
axes
for
which
coordinate
command
is
omitted,
positioning
and
check
are
not
executed.
(3)
If
that
position
matches the
reference
point,
the
reference
point
return
complete
lamp
lights.
If
all
of
the
specified
axes
match
the
reference
point,
automatic
operation
is
continued.
If
there
is
any
axis
for
which
the
position
is
not
matched,
restore
position
error
(alarm
“2072"
—
‘‘2079")
results,
and the
automatic
operation
is
interrupted.
(The
cycle
start
lamp
goes
out.)
(4)
If
G27
is
instructed
during
tool
offset,
the
machine is
positioned
at
a
point
offset
by
the
corrected
quantity,
so
that
the
position
does
not
match.
Therefore,
G27
can
only
be
instructed
after
tool
offset
is
canceled.
T
ool
position
offset
and tool
length
offset
cannot
be
canceled
by
G27
command.
(5)
The
reference
point
means a
point
inherent
to
the
machine
to
which
position
the machine
can
be
restored
by
“manual
reference
point
return”
or
“G28
automatic
reference
point
return.”
For
details,
refer
to
Par.
3.
4.
1.
1,
“Manual Reference
Point
Return."
(6)
Mirror
image
is
valid
in
the
movement
direction
by
G27
command.
To avoid
an
unmatch
error,
be
sure
to
specify
G27
in
the
M94
(mirror
image
OFF)
mode.
(7)
No check
is
made
if
G27
is
executed
with
machine
lock.
If
there is
any
one
axis
for
which
machine lock
(e.
g.,
disregarded
the
Z-axis)
is
ON,
check
is
not
made.
For
example,
if
X-axis
is
disregarded
and
G27
move
command
is
made
for
X-axis,
no
check
is
made.
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