7.
INITIAL SETTING OF TRANSMISSION CONTROL DATA TO
BUFFER
MEMORY
MELSEC-A
1
7.4.5
Setting
a
buffer
memory
area
for
nogrotocol receive
..
,/*.r
-d
.-
This section shows how to set the
AJ71C24
buffer memory area to store data
the
PC CPU
received from the external device in the no-protocol mode.
An
-1)
example is also given.
When the bidirectional mode setting area (address
112H)
is Set to
‘l’,
this
7
-
memory area is set for bidirectional-mode transmission.
betting
Method
I
b15
i
to
bO
106H
(Head address setting)
(Default
:
8OH)
107H
(Buffer size setting) (Default:
80H)
%s
Write
the
memory
size
(number
of
addresses)
in
hexadecimal.
’OINTS
J
(1)
Buffer memory addresses
1 OOH
to
11 FH
are for the special applica-
(2)
Make sure that the specified range does
not
overlap the no-protocol
(3)
Buffer memory address
107H
should include the storage area of the
no-protocol receive data length.
(4)
If
any range except the user area is set, the
AJ71C24
will execute
operations with defaults including the areas mentioned in
(2)
above.
tion area and should not be set.
mode send area
or
the on-demand data area.
Example
I
To set the head address to
300H
and the memory size to
120H (AJ71C24
1/0
addresses
80
to
9F)
(Sequence Program)
p++*”=i
Write
H300
to
buffer
memory address
106H.
H120
Write
Hi20
to buffer memory address
107H.
Address Buffer memory
Shows that the leading address is 3WH,
Shows that the memory length
is
120H.
mol4
)DB*ngh~~lor
1
I
1
,I,
~d~~~~~~
11
Area for no-protocol send
(120H
addresses)
the
no-protocol
rbCdiw
(mcoived
datn
storage
7FFH
[-j
7- 13
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