8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2)
Extension comment memory batch read
Batch read of the extension comment memory using an AnACPU dedi-
cated command is shown below.
)e.ignatlon Method
I
St
No.
:
st.bkn
nu*
Designation in protocol 1 is shown below.
Extension comment
memory batch read
Computer
An1
c24
--A
II
Ill1
I
Number
of
characton
=
(Numbor
of
bytes)
x
2.
HlL
HlL
I
Ill1
I
I1
I
Dosignadn
of
the
range
to
be read
II
HlL
HlL
I
I
I
I
HlL.
Character area B
POINT
I
To
set the number of bytes, the following conditions must be met:
0
1
s
number of bytes
s
128
0
(Head address)
+
[(number of bytes)
-
11
I
extension coment
memory capacity
)erlgnatlon Example
I
To
read
6
bytes of data from the extension comment memory beginning with
7DOH
(2000
in
decimal) in station
.in.
(Message wait time is
0
mSeC)
Computer
-
A171
C24
Check sum is calculated within
this range
E
I
N
0
1
F
F
0
R
0
0
0
7
0
010
8
2
4
(Sumcheckcodeisaddedby
a
Check sum is calculated
-
within this range
Iilo
r
1
1;
------
(0
@)
(3)
(4)
u)
VI
Indicates that:
(1) the content
of
address 07DOH is 12H,
(2) the content
of
addrers 07D1 H
is
ABH,
(3)
the content
of
address 07MH
is
43H,
(4)
the content
of
addrear 07D3H
is
EFH,
(5)
the content
of
addrear
07D4H
is
lCH, and
(6)
the content
of
address 07D5H
is
57H.
8-101
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