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MACRO
I
LEVEL
3)
MAIN PROGRAM
MACRO
i
LEVEL 2
1
MACRO
(LEVEL
4)
MACRO
(
LEVEL 1
1
CALL
Gijfi
I'***
GO 5 I'***
GOG
I1***
Gl-G 1'***
M
:?
t
>
Mon
MUH
M'.f.i
MOO
RETURN
CAN BE READ
OR
WRITTEN
l
*
I
tt
1
tt 1
#
I
it I
i
i
i
i
i
it
3
it S3
it
3 3
it
A
it
S3
LOCAL
VARIABLE
I
LEVEL 2
1
LOCAL
VARIABLE
(LEVEL
3
1
LOCAL VARIABLE
(LEVEL
(II
LOCAL
VARIABLE
l
LEVEL
1
1
LOCAL VARIABLE
(LEVEL
41
Local variable of level 0 is secured for
the main
program;
local
variables(levels
1
to 4)
corresponding to
the called macro level
are
secured for others.
When
a macro is called by
G65.
for
example, the local
variable of
the level of the
calling
side
is saved, and
a
local variable of the level of the newly called side is secured. In this
case,
argument
can
be
passed to
the
macro. Consequently,
even for
the
same
macro,
if
the called
timing
is different, the local variable of that macro level has different values.
When
a
macro
returns to one
level lower
than that
by
instruction of
M99.
the local
variable of that
macro level is cleared
to
(blank).
The local variable of
the
returned
macro
level becomes the local variable that
was
saved
when called.
MDI
write of
local variable :
Do
not
write
in the local variable
by
MDI
during macro program
execution Interrupt
the operation by single-block,
stop
and make
sure that
variable
can
be rewritten.
Local variables can be used in
a subprogram,
too.
In this
case,
the
local variables that
can
be used
are
those of the
current
macro level. However, when
a subprogram
is called,
argument
cannot
be
specified.
When
a
subprogram returns
by
instruction of
M99,
the
local variable of the
current
macro level is
not (blank)
either.
1
2
3
4
5
Fig.
2.14.4 Local Variable
-
255
-
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