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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.7.2
Batch read in units of bits
(a) Using the BR command (ACPU common commands)
esignation Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
Batch read (bit) command
Character area
A
Designation of device
range to be read
Charade, area B
POINT
To designate the device range, the following conditions must be met:
1
e l
c
number of device points
c
256 (setting for 256 points is OOH)
(Head device number)
+
[(number of device points)
-
11
c
maximum
device number
lesignation Example(
TO read the data at 5 points from X40 to X44 in station
"5".
(Message wait time is
100 msec.) (Assume that X40 and X43 are OFF and X41, X42, and X44 are ON.)
The message wait time is designated in the range of 0 to I 5 0 msec in
units of 10 msec, using hexadecimal notation of 0 through FH. Therefore,
l o o
msec corresponds to "A".
r
lndicates thatX44 is ON
lndicates that X43 is OFF
lndicates that X42 is ON
lndicates that X41 is ON
indicates that X40 is OFF
4
7
Y"
,
3,"
X
O
D
4
0
%",n*,YI*,Y*,YI*
Check sum is calculated
within this range
4
.
AJ71C24
Check sum is calculated
0
within this range
0
5
3"
,
) I *
s
T
x
mx
0 5 F F O
~ o ~ , % ~ 6 . , ~ s .
1
1
0
1
' h .
, 3 ) ~
, ~ I X
, Y I "
31%
E
T
x
UH
E 7
11~111~
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