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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3) Extension comment memory batch write
Batch write of data to the extension comment memorv usina an AnACPU
-
dedicated command is shown below.
esignation Method1
St. No. :Station number
Designation in protocol 1 is shown below.
Extension comment memory batch write
command
Character area C
.
I
I
I
I
I
I
I
I
I
I
H I L
H I L
I
I
I
H
~
L
A1
SJ71 C24
Destination of the
A
device range for writing
C
K
1
byte
uses
2 characters.
Therefore, 1 byte data is ex-
pressed in 2 digits (hexadecimal).
&
To set the number of bytes, the following conditions must be met:
.
1
s
number of bytes
5
128
(Head address)
+
(number of bytes)
-
1
5
extension comment
memory capacity
~esignation Example
To write 4 bytes of extension comment to the extension comment memory area beginning
with OBB8H (3000 in decimal) in PC number "0". (Message wait time is 0 msec)
Check sum is calculated within this
range
Indicates that:
IOsllyII,xIHInI,xI(
(1)
56H is written to address OBB8H,
(2) 9AH
is
written to address OBBSH,
(3)
B5H is written
to
address OBBAH, and
(4)
12H is written to address OBBBH.
Computer
0
----
A l S J 7 1
C24
(1)
12)
(31
(4)
Or&,&
$
K
Y1~,llr
,
~
0
0
0
1
D
W
D
O
O
B
8
8
~
0
4
5
~
~
9
~
~
~
5
~
1
Z
C
B
I
H*,5lxJOx%,JOxc41~,42.,B,%,Y~
I
l
l
&,J6xCBr,4ln42*~&,lI~,B~
4&,12~
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