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3. SPECIFICATIONS
MELSEC-A
(2)
Output signals (PC CPU
+
AJ71 C24)
There are 16 output signals:
Y ( n + l ) O
t o
Y ( n + l ) F
are turned ONIOFF by
the AJ71 C24.
Table
3.6 Output
Signals List
Signal
Name
protocol Bidirectional
Received
data read
-
o
completed
Description
When this signal is turned ON by the sequence program in
the no-protocol mode old rect onal maae, data nratlen to the
0 ~ f f ~ l
memory is transmmea from tho A.71C24
to an external
aev ce
(After XnO
is
t ~ r n e d ON
Y
".I
0
is t.rned OFF
-
~
This signal turns ON in the no-protocol modelbidirectional
mode, when the PC CPU has completed reading the data
received from an external device. This data is stored in the
AJ71C24 buffer memory. (After Xnl is turned OFF, Y("+r)l is
turned OFF.
Reserved
PC
Xn6
Xn5
Xn4
(value)
-
Refer-
ence
Sections
-
9.2. 10.2
-
9.2, 10.2
-
-
-
Y(n+1)2
to
Y ( n + l ) F
are reserved for system use only. AJ71C24 functions
cannot be guaranteed if these signals are turned ON or
OFF
by a se-
quence program.
p K i q
Example:
Use
of input signals Xn4 to Xn6.
Request from cornputel
E
Station
Computer
number
Message wait time
Q
H
L
i
1
NAK
ACK
O r
I
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