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7.
INITIAL SETTING OF TRANSMISSION CONTROL DATA TO
BUFFER MEMORY
MELSEC-A
7.4.5
Setting a buffer memory area for no-protocol receive
This section shows how to set the AlSJ71C24 buffer memory area to store
data the PC CPU received from the external device in the no-protocol mode.
An example is also given.
When the bidirectional mode setting area (address 112H) is set to
"I",
this
memory area is set for bidirectional mode transmission.
etting method
1
Write the head address in hexadecimal
b15
to
bO
106H (Head address setting)
(Default : 80H)
107H (Buffer size setting)
(Default: 80H)
I
Write the memory size (number of
addresses) in hexadecimal.
POINTS]
(1) Buffer memory addresses 1 O O H to 11 FH are for the special applica-
tion area and should not be set.
I
(2) Make sure that the specified range does not overlap the no-protocol
n r the
nn-T1PmRnT1
a r m
(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 AlSJ71C24 will execute
operations with defaults including the areas mentioned in (2) above.
.xamplel
To set the head address to 300H and the memory size to 120H (AlSJ71 C24 I10 addresse:
80 to
SF).
(Sequence Program)
Write H300 to buffer memory address 106H.
TOP
(
H8
I
H107
Write HI20 to buffer memory address 107H.
Address
Buffer mernor
OH
I
-
J
lOeH
\ " [
Shows that the leading address is 300H
-
107H
Shows that the memory length is 120H.
300H
to
41 FH
DFFH
the noprMocot receive
(received datastarage
Area for no-protocol send (1 20H addresses)
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