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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8.2
AnACPU dedicated commands and device numbers
D
(1) The AnACPU dedicated commands used for direct read and direct write
of extension file registers are described below.
These dedicated commands are used to access the extension file
register of block numbers 1 to 256 by directly designating the address,
which begins with address 0 in block number
1,
as the device number.
The address numbers used to access the extension file register go from
0 to 'the usable number of blocks x 8192 points".
Processing
Note
:
o
Executable
x ........... Not executable
(2)
Device numbers of extension file registers
(a) Device number range
Range:
0
through [(the number of usable blocks x 8192)
-
I ]
Device numbers used with APCU
Device numbers used with AnACPU
common commands mentioned in Sec-
dedicated commands mentioned in Sec-
tion 8.8.1.
4
0
to
8191
1
Block No. 1
1 word
Block No. 1
area
Block
No.
2
16383
,
Device numbers are allocated in
1 word
ascending order from the blocks
assigned
a
smaller block number.
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