8.
COMMUNICATIONS
USING
DEDICATED
PROTOCOLS
MELSEC-A
(b) Using the
QW
command (AnACPU dedicated command)
leelgnation Method
I
St
No.
:
st.tion
number
Designation in protocol
1
is shown below.
Character area
C
command
To
designate the device range, the following conditions must be met:
0
1
I
number of device points
I
64 (10
for a
bit
device)
0
(Head device number)
+
[(number of device points**)
-
11
I
maximum
device number
**("number
of
device points"
x
16
for a bit device)
lerignation Examples
I
Example
1:
To
write data to
32
points from
M640
to
M671
in
station
"0".
(Message wait time is
0
msec)
within this range
21
3141
7
At
T
T
T
elale.
001000110001011(11010~101110010110
MMM
m~mmmmm
mYmm
6
6
6
_________________
6
6
6
6
8
6 6
_________._______
6 6
6
6
565
4444778
5555
513
3210109
9876
IPOlNTl
1
The
QW
command
is
used for word unit designation. The designation
for the number
of
device point to write data to
32
points from
M640
to
M671
is
'02"
("1"
for
16
points).
8-38
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