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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(b) Monitoring the devices registered by the QM command (AnACPU
dedicatedcommand)
esignation Method
Designation in protocol 1 is shown below.
St. No. : Station number
Monitor (word) command
computer
NO
~a
wattime
H L H L
H
1
Character
area
8
.
i l i 1 i I I I I
i l I I I I I
-
;
; ;
1~17
NO.
NO.
resuns
I
I
rervlls
&
H L H L
H 1
The number of characters for the number
of points designated by monitor registration (QM)
1 point of device uses 4 characters
Therefore,
a
1 -word data is expressed in 4 digits
(hexadecimal)
H L H L
Monitoring is executed after registering the monitor data (word units) as in Example 2
of (2) (b) (Message wait time is
0
msec)
Indicates that the data in D l 5 is 1234H
(4660 in decimal).
Indicates that the data in W11 E is 0050H
(80 in decimal).
Check sum is calculated
within this range.
Indicates that the present value in T I 23
A
&
is W64H(1 W in decimal).
o
1
I
1
6
1
4
I
.
O
O
O
o
O
I
l
l
O
l
i
O
o
l
o
o
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
Computer
I
I
I
I
A
c
K
&
E
N
o
c&
0 0 0 1
a , ~ .
A1 SJ71 C24
%s.
&,a
0
0
0
1
~
0
&,II.
S
X
m .
E
X
I
T O O O 1 1 2 3 4 / 0 O 5 0 ~ 0 0 6 4 ~ 0 7 6 4 T
~ , ~ ~ , 1 1 , 1 1 . , a , l ~ , u ~ ~ , a , 1 5 . , ~ ~ ~ , ~ , ) i * , u ~ a ,
4 8 .
,SL
E
E
% I S M
o
S F
sfi~
Check sum is calculated within this range.
4
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