8.
COMMUNICATIONS
USlNG
DEDICATED PROTOCOLS
MELSEC-A
Batch read
(1)
Commands and addresses
(a) AnACPU dedicated commands
c.
Commrnd
Proeoulng
DR
44H,
52H
Reads from the extension commont
I
1
memory.
i
DW
144H.
57H
I
Writer
to
the
extension
comment memory.
I
128
bytes
I
o
I
o
I
x
1
Note
:
o
........
Executable
x
........
Not executable
(b) Extension comment memory addresses
The extension comment data storage area is managed
in
relative
addresses
with
the head address
OOH.
For
example, the range that can be set to the head address for an
extension comment memory of 3K bytes is
OOH
to
BFFH.
1)
The maximum extension comment memory area is 63K bytes.
The address range for the extension comment data is deter-
mined
in
accordance with the paraemter set capacity.
2)
Designation of the extension comment memory address is made
by converting 5-digit hexadecimal into ASCII code
(00000
to
OFFFF).
3)
A
character error
'06Ha
occurs if the extension comment memory
capacity is not equal to
or
greater than [head address
+
(set
number of bytes
-
l)].
Reading or writing extension comment data by designating specific
devices or device numbers is not possible.
Always read
or
write extension cdmment data beginning with address
OH.
,p
-
.u
-
L
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