8.
COMMUNICATIONS
USING DEDICATED PROTOCOLS
MELSEC-A
POINTS
I
(1)
To
designate the
bit
device ranges in units of words, the
bit
device
number must be a multiple of
16.
(2)
Although the ranges are designated for
MI
L,
and
SI
if
the range for
M
is designated
by
L
or
SI
the same processing occurs. This is also true
for the ranges for
L
and
S.
(3)
The ranges of special relays
(M9000
to
M9255)
and special registers
(D9000
to
D9255)
are divided into the areas for read only, write only,
and system use.
Trying to write data to the ranges outside the write-only area might
cause the PC CPU to malfunction.
The ACPU programming manual gives details concerning special
relays and special registers.
(4)
When using an extension file register to read/write file register data
from/to a PC CPU, use the commands explained in Section
8.8
for file
register
(R)
read/write operations, use the commands explained in
Section
8.8
for read and write operations for the file register
(R).
8-24
-c
n
Y
I
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