3.
SPECIFICATIONS
I.
,
MELSEC-A
POiNTSl
(1) The functions available with the no-protocol mode cannot be used
together with the functions available with the bidirectional mode men-
tioned
in
Section 3.3.3. Select either mode using the mode setting
switch (see Section 4.3.l)/switching the mode (see section 3.4) and
by
setting the bidirectional mode setting area
in
the special applica-
tions buffer memory area (see Sections 3.5 and 10.2).
(2) The receive-completed code and the receive-completion data length
can be set and enabled at the same time. When both
of
them are
enabled, the received data read request to the sequence program is
made
in
response to whichever is received first by the AJ71C24.
3.3.3
Functions available
In
the
bidirectional
mode
(1) Functions
in
the bidirectional mode
\\
Functlon
Send (PC
CPU
.a
computer)
Receive
(Computer
-.
PC CPU)
:om-
I.nd
Doocrlptlon
A PC CPU uses the
TO
instruction to
output data written to the AJ71 C24
buffer memory area in unchanged
code to a computer.
after data send
the
A171 C24 trans-
response message from a computer
mits
a
send comploted signal to
the
aequonce program.
A PC CPU uses the
FROM
instruction
to read data from the AJ71 C24 buffer
memory which was transmitted by
a
computer.
-
When the AJ71 C24 receives the data
read completed signal from the
so-
quence program, the AJ71 C24 trans-
mits a response message
for
the data
receive to a Computer.
-
When the AJ71C24 receives the
Number
of
Point
Prooesoed
per
Communlcationo
127 words
Can
be
(default
value).
the buffer size
changed with
tions 7.4.4 and
setting (see Sec-
7.4.5.)
PC
CPU
State
During
STOP
sw22
sw22
(2) Setting data length setting for data send
The length
of
the data to be transmitted between an AJ71C24 and a
computer is set within the send message. (see Section 1
.l .l
(2) (b)).
(a) When data is transmitted to a computer:
When the data to be transmitted to
a
computer is output from the
sequence program to an AJ71 C24, the data length is written to the
buffer memory of the AJ71 C24.
The AJ71 C24 sets the data length to a send message and transmits
it along with the data to a computer.
This allows the length
of
a send message to vary according to the
content and kind of data to be transmitted.
3- 14
-.
-
-
.
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