7.
INITIAL SETTING
OF
TRANSMISSION CONTROL DATA TO
BUFFER MEMORY
MELSEC-A
ietting
Method
I
b15 to b8 b7 to bO
-
119H
I
Thenumber(lHtoDH)ofth.~to~switcheddmitten.
ored.
‘olHtoDHocwr~tothswtval~(1toD)afthernode
00isstoredwhsntheAJ7lC24sta&3up.
0
Aftor
witching
tho
mod.,
the
changed
mode
number
h
atod
sabing
switch
(see
Section
4.3.1).
,
hare.
OH
:
Without e mode switching request
1H
:
With
a
mode
rwitching requert
2H
:
Mods switching
completed
(written
by
the AJ71C24)
ixPmple
1
,
when the mode
is
switched from
a
PC CPU to mode number
1
(AJ71C24
I/O
addresses
80
to
QF)
X87
Modedtching
rqwot
Th.
switching
request
is
changed into
pub.
is written.
The
mode switching flag
isset
Mo
A
mode
switching
roquest
M1
X87
K10
-11
1:
TO
X87
HI
+FROMI
H8
1
H119
I
DO
I
Kl
...................
.....................
....
................................................
Initial pr-ing
atarb.
Afterthe
initial
prdng
b
completed,
nwdo
switch
ing
completsd
is
read.
The
data
numbers
to
be
mitten
differ
depending
on
the
commun’d
method.
I
I
I.
The
mode switching Rag
is
reset
i
--
1
1
d
d
1
J
1
d
7
7-
19
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