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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.7
Device Memory ReadIWrite
8.7.1
Commands and device ranges
(1) The ACPU common commands and device ranges used for device
.
.
memory readlwrite are described below.
(a) ACPU common commands
PC CPU Status
Command
u
Number of
I
Points
-
uring
;TOP
-
0
-
0
-
0
IUN
-
w2:
I F F
-
0
-
X
-
X
-
0
-
0
-
ASCII
Processing Contents
processed
per Com-
munications
I
i
i
I
Reads bit devices
(X,
Y, M, etc.) in units of
256
points
Bit
BR
4 2 ~ . 52n
points,
units
Reads bit devices (X,
Y, M,
etc.) in units of
3 2 words
57n, 52n
Reads word devices
(D,
R.
T. C.
etc.) in
mi++ of
ooints~
64 points
3atch Read
Writes data to bit devices
(X, Y. M,
etc.) in
I
BW
I
42n, 57n
I
units
of
paints.
Writes data to b i t devices
(X. Y,
M, etc.) in
10 words
units of 16 points.
(160 points)
Word
57H, 57H
units
Writes data to word devices
(D.
R, T, C,
64 points
etc.) in units of points.
+---+
3atch Write
E M
units
-
Word
units
Setslresets bit devices
(X,
Y.
M, etc.) in
4 2 ~ . 54n
units of points by designating the devices
20 points
and device numbers at random.
Setslresets bidevices (X,
Y.
M, etc.) in
10 words
units of 16 points by designating the
(1 M 1 points)
devices and device numbers at random.
57n, 54H
Writes data to word devices (D, R.
T, C,
etc.) in units of points by designating the
10 points
devices and device numbers at random.
rest
(Random
Write)
I
I
I
I
Bii
Sets the bit devices D(, Y, M, etc.) to be
units
42n' 4Dn
monitored in units of points.
40 points*
Monitor
Data
Registration
Sets the
bi
devices (X,
Y,
M, etc.) to be
20 words*
57H, 4Dn
Sets the word devices
(D,
R,
T . C,
etc.) to
20 points
be monitored in units of points.
Word
units
1 1
4Dn, 42"
1
units
Monitors the devices registered for
-
monitoring.
,,nits
4 0 % 4En
Monitor
Note
:
o
.......
xecu
.........
x
Not executable
Forthe number of processing points indicated by an asterisk (*),the number
is one half of the values indicated i n the table for the input device
(x)
when
PC CPUs other than the A3H CPU, A2ACPU(S1), and A3ACPU are used.
(See *1 in 3.3.1 (I).)
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