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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2)
Parameter memory batch read (ACPU common command)
Designation
in
protocol
1
is shown below.
Parameter memory read command
I
Character area A
I
I
I
1
1
1
1
I
4
Parameter
st.
PC
M~~~~~~
head address
(
p length
Sum
Computer
N ~ .
NO.
waittime
(5sharactero
characters check
hexadecimal)
hexadecimal1 code
H i L H l L
I
I I I I
H
I
L
H l L
AJ71C24
Designation of the parameter
r
memory address range to be read
1
Number of characters
=
(Byte
length) x2.
I-word data uses 2
Therefore, a I-byte data is
expressed in
2
digits
(hexadecimal).
I
I
I
I
I
I
I
I
Parameterdatato
Sum
St.
PC
ba read
T
c h w k
Yo.
NO.
1
I . . 1
I I L H I L
H l L l H l L l
l H l L
H l L
Character area El
To designate the byte length, the following condition must be met:
1
5
byte length
5
128
esignation Example1
To read 4-byte parameter data in parameter memory addresses 280H t o 283H of
the PC CPU in station number
"5".
(Message wait time is 0 msec)
Check sum is calculated
within this range
.
' ; i
;om-
E
uter
~
0
5
F
F
P
R
0
0
0
2
8
0
0
4
2
1
Check sum is calculated
A C
O
S
F
F
within this range
K
05"
X l x 1 3 5 ~
46n84k
1 0 ~ ~ 5 2 1 M n 3 1 ~ , 3 0 n , 3 2 ~ , 3 8 n , 3 0 ~ X i n l l l n 3 2 ~ ~ 3 1 ~
4
061 30x,11*
( 6 * , 4 6 r
J71 C24
S
E
T
0
5
F
F
0
F I E
D I A
9 I C
R
T
F
2
X
X
Indicates that:
The contents of parameter memory address 280H is OFH
The contents of parameter memory address 281 H is EDH
The contents of parameter memory address 282H is A9H
The contents of parameter memory address 283H is CBH
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