8.
COMMNICATIONS
USING
DEDICATED
PROTOCOLS
MELSEC-A
8.1
0.3
Reding
dd.
from
the
8peci.l-functlon
module
buffer
memory
(ACPU
common
comma)
Iesignation Method
I
St
No.
:
Station
number
Designation in protocol
1
is shown below.
Wl
C24
(1) To designate the byte length, the following condition must be met:
0
1
I
byte length
I
128
(2)
With some special function modules,
2
or
3
bytes are used to
express the data. Therefore, designate the byte length by referring
to the manuals for each individual module.
I
besignation Example]
To
read the data from buffer memory address 07FOH
to
07F3H
(4
bytes) of the special-function
module (module number 13H) loaded at
I/O
numbers 120 to 13F
in
station number
"0".
(Message wait time is
0
msec)
Check sum
k
calculated
within this range
-
AJ71
C24
This indicates that
module
I/O
allocation is
120
to
13F
IIII
Indicates
that:
The contents
of
buffer memory address
007FOH
is
12H
The contents
of
buffer memory address
007F1 H
is
78H
The contents
of
buffer memory address
007F2H
is
43H
The contents
of
buffer memory address
007F3H
is
65H
8-74
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