3.
SPECIFICATIONS
MELSEC-A
(1) Functions
in
the no-protocol mode
n
I
I
Nurnkr
of
Point
Procoswd por
Comrnunlutimr
\
Send
(PC
buffer memory area in unchanged
tarnal
output
data mitten to an AJ71
C24
-
CPU
-+
ex-
,27
words
A
PC CPU
uses the
TO
instruction
to
(default value).
device)
code to an external device.
Can
k
changod with
Receive
A
PC CPU
uses the
FROM
instruction
ting
(see
sac.
buffer
size
set-
(External
tions 7.4.4 and
7.4.5.).
memory which was transmitted from
devlce
-+
to
read from an AJ71
C24
buffer
-
PC CPU)
an external device.
PC CPU Stat.
I
During
STOP
0
-
(2) Receive completion by the completed code and by the completion data
length
There are
two
ways to complete the data receive when an AJ71C24 is
receiving data from an external device:
(a) Reading the received data using the receive completed code
(receive of variable-length data)
When an AJ71C24 receives the receive completed code which is
set
in
the buffer memory by the user from an external device, the
AJ71C24 transmits a received data read request to the sequence
program.
The sequence program,
in
response to the read request, reads the
received data up to the receive completed code transmitted by the
external device.
The user can freely set the receive completed code.
(b) Reading the received data using
the
receive-completion data length
(receive of fixed-length data)
When an AJ71 C24 receives data of a designated length which is set
in the buffer memory
by
the user from an external device, the
AJ71C24 transmits a received data read request to the sequence
program.
The sequence program,
in
response to the read request, reads the
received data of the designated length transmitted by the external
device.
The receive-completion data length can be set within the buffer
memory area allocated for the no-protocol receive.
1
I
-.
1
-f
e
3-
13
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