8.
COMMNICATIONS USING
DEDICATED
PROTOCOLS
MELSEC-A
8.9.2
Reading data from
buffer
memory
(ACPU
mmon command)
)esignrtton Method
I
St
No.
:
StaJjon number
Designation
in
protocol
1
is
shown below.
1
Character area
6
I
POINT
I
1
I
I
To
designate the word length, the following conditions must be met:
0
1
I
word length
I
64
I
0
(Head address)
+
(word length)
-
1
5
maximum address
number
(7FFH)
1
I
Iesignatlon Example
I
To
read 2-word data from buffer memory addresses 180H and 18lH
in
the
AJ7
station number “1
0”.
(Message wait time
is
0
msec)
1
C24 of
Check sum
is
calculated
within this range
h
Computer
Ch.ckwmbdcukt.d
1
D
o
2
o
o
I
a
o
o
c
R
F
F
o
A
N
E
COAFF
A
K
oSnxL,4Iw
%*
&,5&
&
*&
&&4l.
q
J1.A
&~&~Jlm&~Xm&,31.
Q
within this
range
,
AJ71
C24
X
I
X
E
I
s
TOAFFABCDII~~~TO~
op,
JO*u~~C41.,an~(l.l~l.,Q*U1,W*~+h,~ll
Indicater that:
The
content
of
buffer memory address 180H is ABCDH (-21
555
in
docimal)
The content
of
buffer
memory
address 181H is 1234H (4660 in decimal)
I
3
Y
I
8-68
Y
c
I
i;
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