Table of Contents
Advertisement
8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(b) Monitoring the devices reaistered bv the QM command (AnACPU
. .
-
dedicatedcommand)
esignation Method
1
St. No. :Station number
Designation in protocol
1
is shown below.
Monitor (word) command
I
Character area B
AJ71C24
I
IHILIHILI
I I I
I
I I I I
I
I H I L I
The number of charactersfor the number
of points designated by monitor registration (QM)
1 point of device uses 4 characters
Therefore, a l-word data Is expressed in 4 digits
(hexadecimal)
esianation Examole1
Monitoring is executed after registering the monitor data (word units) as in Example 2
of (2) (b) (Message wait time is 0 msec)
Check sum is calculated
within this range.
-
' I
Computer
1 s F F M Q o
C 4
Check sum is calculated within this range.
i*,B*l.,45"4a,il. 3.
r:.,w.
+
AJ71 C24
S
E
T
1 S F F i 2 3 4 j 0 0 5 0 : 0 0 6 4 / 0 7 6 4
T
2
3
X
Indicates that the data in D l 5 is 1234H
(4660
in decimal).
lndicates that the data in W1lE is 0050H
(80 in decimal).
lndicates that the present value in TI23
(100 in decimal).
0
7
6
0
0
0
0
0
1
1
1
0
1
1
0
0
1
0
0
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
S
6
6
6
6
6
6
6
8
6
6
6
6
6
6
6
F
E
D
C
B
A
9
6
7
6
5
4
3
2
1
0
Advertisement
Table of Contents
