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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3)
Comment memory batch write (ACPU common command)
esignation Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
Comment memory batch read command
1 byte uses 2 characters.
Therefore, 1-byte data is ex-
pressed in 2 digits (hexadecimal).
! Y
\ . I
Character area C
POINT/
To set the number of bytes, the following conditions must be met:
E :
1
5
number of bytes
5
128
(Head address)
+
[(number of bytes)
-
I ]
5
Comment memory
capacity
esignation Example1
To write
4
bytes of comments to the area beginning with address OBB8H (3000 in decimal)
in the PC CPU of station number "0". (Message wait time is 0 msec)
I
N o
H I L
Check sum is calculated within this range
AJ71 C24
"
Designation of the
range to b e read
Indicates that:
(1) 56H is written to address OBBBH,
(2) 9AH is written to address OBB9H.
(3) B5H is written to address OBBAH, and
(4)
12H
i s written to address OBBBH.
I
PC
N O
HIL
A
I
I
Head
address
(4
characters
hexadecimal)
I
I
1
I
I
St.
NO.
I
umber of bytes
( 2 characterr
hexadecimal)
I
~ e s s a ~ e
wait time
I
PC
N O .
Data for the designated
number of bytes ('number
of b y t e s x 2 characters)
I
Sum
check
code
H I
L
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