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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2)
Extension comment memory batch read
Batch read of the extension comment memorv usina an AnACPU dedi-
-
cated command is shown below.
lesignation ~ e t h o d l
St. No. :Station number
Designation
in
protocol
1
is shown below.
Extension comment
memory batch read
\
POINT
.
Character area A
I
l
l
I
l
l
1
I
Number of characters =
(Number of bytes) x 2.
1 address is expressed
in
H l L
HlL
I
I
l
l
1
I
n
L
I
I
I
A1 SJ71 C24
Designation of the
DU
in
ex
I
To set the number of bytes, the following conditions must be met:
1
s number of bytes
s
128
1
range to be read
(Head address)
+
(number of bytes)
-
1 s extension coment
memory capacity
I
lesignation ~ x a m ~ l e (
To read 6 bytes of data from the extension comment memory beginning with 7DOH (2000 in
decimal) i n PC number "1". (Message wait time
is
0 msec)
P
Character area
B
s
;
(1)
I21
131
141
I51
161
Indicates that:
(1) the content of address 07DOH is 12H,
(2) the content of address 07D1 H is ABH,
(3) the content of address 07D2H is 43H.
(4) the content of address 07D3H is EFH.
(5) the content of address 07D4H is
I
CH, and
(6)
the content of address 07D5H is 57H.
St,
No,
HIL
Check sum is calculated within
Computer
PC
No,
HIL
sioncom.
m e l t m e i o w
I
- ,
I
I
I
I
.
A1 SJ71 C24
Check sum is calculated
+
within this range
E
N
o
this range
(Sum check code is added by
A1 SJ71 C24.)
4
q
E
T
X
------
S
T
X
sum
s h e k
code
n l
L
F 8
0 0
A
K
OL
0 0
O
'
C O O O l
&,a
Y\Irll.
0 1
Y\IJm
R
I
I
I
I
I
1
2 ( A
8 1 4
3 ( E F ( 1 C ( 5 7
I
I
I
I
I
II~~~,4l~~~~H.~UI,KK(&,JI~~4Lc~,nn
0 0 0 7
D
0 1 0 6
I
O L Y \ I , Y \ I % P , J I " U * , ~ ~ * % M * , % , ~ " , , , % , ( ~ , B
E
T
OL
7
C
nl,&
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