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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(b) Using the QT command (AnACPU dedicated command)
Designation Method
St. No. :Station number
Designation in protocol 1 is shown below.
the bit device Is designated.
I
Batch read (random wri
Character area C
.
1 point of device
uses 4
characters.
l l l l l l l ! l l l l
[ I
Therefore. a l-word data is ex~ressed
Computer
computer
-
1
in
4
digits (hexadecimal).
~;~:q~;~
H L H L
A1
SJ71
C24
Designation the h e a G h e h e n
I
To designate the device range, the following condition must be met:
I
a
1
s
number of device points s 40 (40 units for bit devices where 1 unit
corresponds to 16 points)
s l .
NO.
HIL
I
l
l
PC
NO.
HIL
To change the present value in PC number
"01"
as indicated below.
(Message wait time is 0 msec)
Indicates to change the data in
Ct00 to 64H (100 in decimal).
a
i
M -
welttime
I
Numterd
dwicepainb
(2charaderr
(hexadecirn*
I
I I I I I I I I I I
h i e
'
m t a
~charewr)
1 6 -
I I I I I I I I I I
-
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