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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8.7
Direct write t o the extension file register (AnACPU dedicated command)
esignation Method
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1 device point uses 4 characters.
b!h
Therefore. a 1 -word data is expressed
in 4 digits (hexadecimal).
St. No. :Station number
I I I I I 1 H
l
L
i
I H l L l
POINT
Designation in protocol 1 is shown below.
A1 SJ71 C24
Designation of the device
/
range to be written
I
To designate the device range, the following conditions must be met:
1
1
5
number of device points
1 ;
64
A
2
(Head device number)
+
(number of device points)
5
maximum device
number
lesignation Example
St
N O
To write data to 3 points : R8190 and R8191 in extension file register block number 12
and RO in block number 13, in PC number
"01".
Assume that extension file register
block number 9 does not exist. (Message wait time is 0 msec)
I
PC
N O
Indicates that:
The content to be written to R8190 of block Number 12 is 0123H (291 in decimal)
The content to be written to RE191 of block Number 12 is AB07H (-21753 in decimal)
The content to be written to RO of block Number 1 3 is 3322H (13090 in decimal)
Check sum is calculated within this range
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