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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(b) Using the QT command (AnACPU dedicated command)
Batch read (random write, word) command
\
Character area C
A
AJ71C24
<
Designation the head dev~ce when
the bit device is designated.
' . .
1 point of device uses 4 characters.
Therefore,
a
1-word data is expressed
in 4 digits (hexadecimal).
Computer
To designate the device range, the following condition must be met:
r
"
I
1
5
number of device points r 10 (10 units for bit devices where 1 unit
corresponds to 16 points)
/
Designation Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
-
D
-
.
-
I
Number of
device points
12characlen
mexad~imal)
I
E
esignation Example
I
I I I I I I I I I I
Device
I
Data
Vcharacten)
/
Clchaades)
I I I I I I I I I I
1
1
1
1 ; .
H l L
2.
H I L
To change the present value in station number
"5"
as indicated below
(Message wait time is 0 msec)
inD5OO
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
l
l
l
l
i
l
l
l
l
l
l
l
l
l
l
l
to1234H
,
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(4660in
F
E
o
c
s
a
8
8
7
s
s
4
3
2
1
o
decimal).
Each bit indicates
reset (OFF) if 0, and
set (ON) if 1
a
I
Indicates to change the data in
C100 to 64H (100 in decimal).
Message
waittime
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