Mitsubishi Electric AJ71C24-S6 User Manual page 179

8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8.6
Direct read of the extension file register (AnACPU dedicated command)
esignation Methodl
St. No. :Station number
Designation in protocol
1
is shown below.
Extension file register
batch read command
\
Character area A
\
Character
area
B
St.
Computer ;
I I H I L ~ H I L
I
I I
I I I I I I
I ' H
I
L " I H I L
Designation of the
device range to be read
To designate the device range, the following conditions must be met:
1
c number of device points
5
64
(Head device number)
+
(number of device points)
c
maximum device
number
1 t 1
PC
No.
1 I H I L ~ H I L ~
esignation Example
/
To read the data
at
points of
R B I 9 0
and R8191 of extension file register block number
2
in station number
"0".
(Message wait time is 0 msec)
S
The content of R8190 of block Number 2 is 1234H (4660 in decimal)
The content of R8191 of block Number 2 is 7ABCH (31420 i n decimal)
Message
wait time
I
No,
I I I I I I
I
I
1 device point
uses
4 characters.
he^^,"^,"^
(7 characters,
I
PC
No,
Number of
device points
Therefore, a 1-word data is
l g ~ ~ ~ ~ ~ ~ ~ ,
expressed in 4 digits (hexadecimal).
Data
for
the derignated
number of device points
('designated number of
device points
X
4 characters]
E
T
X
I
Sum
check
code
H I L