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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 Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
Extension comment memory batch write
command
Character area C
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1 byte uses 2 characters.
Therefore, 1 byte data is ex-
pressed in 2 digits (hexadecimal).
I
,
,
I I H I L I H I L I
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I
I
I
I
I
I
~
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I
I H I L
AJ71 C24
Destination of the
device range for writing
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To set the number of bytes, the following conditions must be met:
I
1
r
number of bytes
5
128
(Head address)
+
[(number of bytes)
-
11
r
extension comment
memory capacity
wail time
A
esignation Example
(
TO write
4
bytes of extension comment to the extension comment memory area beginning
with OBB8H (3000 in decimal) in station number "0". (Message wait time is 0 msec)
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I
C
,
,
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Head address
'Number
of
bytes
(5 characters
(2
characters
hexadecmall
:
hexadecimal)
I
St.
N O
Check sum is calculated within this range
-
/
PC
NO.
Indicates that:
(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.
Data for the designated
number of bytes Cnumber
of bytes' x 2 characters]
I
Sum
check
code
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