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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8.4 Batch read of the extension file register (ACPU common command)
iesignation Method
1
St. No. :Station number
Designation in protocol 1 is shown below.
Extension file register
batch read command
\
Character
area
A
Character area B
I
1
)
I
I
I
I
I
I
I
I
1 device point uses 4 characters.
1
I
POINT
TO designate the device range, the following conditions must be met:
1
5
number of device points
5 6 4
a
(Head device number)
+
(number of device points)
5
maximum device
number
r
jesignation Example]
St.
TO read the data at 2 points of RBI90 and R8191 of extension file register block number
12 in station number "0". (Message wait time is 0 msec)
Therefore, a I-word data is
Computer
;
H I L
Number at
Indicates that:
The content of RE190 of block Number 12 is 1234H (4660 i n decimal)
The content of RE191 of block Number 12 is 7ABCH (31420 i n decimal)
Sum
A
computer
I
I
AJ71 C24
oats
tor h e designated
Designation of the
s
Sf,
PC
number d d w i c e point*
E
device range to be read
N ~ . NO.
('d"ig"a'ed
number
Of
T
device aointr'
X
X
PC
No,
H I L
S f .
E R
I
PC
AJ71C24
.
Check sum is calculated
within this range
E
Check sum is calculated within
this range (TheAJ71C24adds
the sum check code.)
ueitfime
" I " " "
x
'
A
c
K
He%b'li"'
(7 characters)
I
I
I
I
I
I
9
c
jgl,4il
@ ? , ~ W , X W
o
2
1 0 ~ 3 2 .
'
o o
a,a,,a,a.,js,
device
paints
,
~
~
:
~
~
~
~
~
~
)
H
I
L
'
F
F
E
~ ! o , r
2 R
a r
9
o
i
1
ii,~:~/~*!:~~,~?w,~w,x~,:~.,:~l,~
N
4 6 ~ ~ 4 5 "
check
expressed in 4 digits (hexadecimal).
;
code
H l L
a
I
~ % ~ % , ~ ~ 1 ~ 1 ~ , 1 6 ~
o o
T O O F F 1 2 3 4 7 A B C T B s
> ! ~ , ~ ~ M , U B , > L
F
F
No,
H l L
37",4,~,'!.,4J~OJ"
No,
H l L
E
x
<!.,%
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