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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3)
Microcomputer program batch write (ACPU common command)
esignation Method
1
St. No. :Station number
Designation in protocol 1 is shown below.
Microcomputcr program batcn read command
(LW
for m a n and VW for s ~ o program)
\.,
Character area C
r l I I I I
I
I
I
I
I
I
Computer
I
I
I
I
I
8
.
8
.
I IHILIHILI
I
I
I
I I I
I
I I
I
I
I H I L I ~
rang; to be read form
I
Number of chaiacters
=
(Number
of bytes) x 2.
1 address uses 2 characters.
Therefore, 1 address is expressed
1 .
. .
~n
2 d ~ g l t s (hexadecimal).
To set the number of bytes, the following conditions must be met:
1
5
number of bytes
c
128
(Head address)
+
[(number of bytes)
-
l]
5
Microcomputer program
capacity
lesignation ~ x a m p l e l
To write 6 bytes of a microcomputer program t o the area beginning with address 1338H
(5000
in decimal) in the PC
CPU
of station number "2". (Message wait time is 0 msec)
Indicates that:
(1) 12H is written to address 1388H,
(2) ABH is written t o address 1389H.
(3) 5FH is written to address 138AH.
(4) 7CH i s written to address 138BH,
(5) 43H is written to address 138CH, and
(6) 9AH
is
written to address 138DH.
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