7.
INITIAL
SETTING
OF TRANSMISSION CONTROL DATA TO
BUFFER
MEMORY
MELSEC-A
7.4.4
Settlng
a
buffer
memory
area
for
mpfatocol
w#rd
This section describes how to set the AJ71 C24 buffer memory area to store
data transmitted from the PC CPU to an external device in the no-protocol
mode and gives an example.
When the bidirectional mode setting area (address 112H) is set to
'la,
this
memory area is set for bidirectional mode transmission.
iettlng
Method
I
1-
Writethe
hod
address
in hexadecimal
104H
(Head
address sotting)
(Default
:
OH)
lOSH
(Buffor
size
setting) (Default
:
8oH)
Write
the
memory
size (number
d
addresses) in
hedecimal.
POINTS
I
(1) Buffer memory addresses 100H to 11 FH are for the special applica-
(2)
When other kinds of devices are also used, make sure that the
specified range does not overlap the no-protocol receive area or the
on-demand data area.
(3)
Buffer memory address 105H should include the storage area of the
no-protocol send data length.
(4)
If
any range except the user area is set, the AJ71C24 will execute
operations with defautts including the areas mentioned in (2) above.
tions area and should not be set.
ixample]
To
set the head address to 120H and the memory size
to
100H (AJ71C24
1/0
address
80
to
9F).
(Sequence Program)
TOP
I
H8
I
H1
Write
H120
to buffer memory address
1MH.
I
Write
H100
to
buffsr memory address
10SH.
Address Buffer memory
104H 120H
Shows that the head addross
is
120H.
1 OOH
Show8 that the memory
size
Is
1WH.
Area
for
no-protocol send
(1OOH
addresser)
7- 12
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