3.
SPECIFICATIONS
MELSEC-A
3.6
I/O Signals List
for
CPU
The
I/O
signals of the AJ71C24 for the PC CPU are listed below. The
numbers (n number) appended to
X
and
Y
are determined by the installing
position
of
the AJ71C24 and the number of
I/O
signals used by the
I/O
signal
signals used by
the I/O
modules installed in front of the AJ71 C24. (Example:
XnO
+
X0
when the AJ71C24 is loaded in slot
0
of the main base unit)
(1) Input signals (AJ71C24
-.
PC CPU)
There are
16
input signals: XnO to XnF are turned
ON/OFF
by the
AJ71 C24.
Table
3.5
Input Slanrlr Llrt
r
-
Sign81
N8me
Send
:ompleted
Received
data read
request
Modr
4o-protaoll
liditectiond
Turns ON when the send from the AJ71 C24 to the external
device
is
completrd when Y(n+l)O is turned ON.
Turns OFF when Y(n+l)O
is
turned OFF.
92, 10.2
9.2,
102
0
Turns ON when the completed code, fixrd length data, or desig-
nated data length is received from the external device. Turns
OFF when Y(n+l)l is turned ON.
Turns ON/OFF according to the message (factor number) when a
alobal command is received from a computer.
0
Blobal
signal
3
n-
demand
function
operating
AJ71 C24
message
sequence
state
Turns ON when the on-demand transmission is executed accord-
ing to the request from the sequence program. Turns OFF when
the on-demand transmission is completed.
xn3
I)
Setvalues'l'to'8'ofthsm~~ngswitch~(seeSection4.3.1)
indicating the
state
of
tommunicatiems between
the
computer con-
nected
to
the
interface
on
the
dediid
protocol side and the
An1
C24.
Set
values
'A'
to
*D'
of
the
mode
dng switches indicating
the
atate
of
communications batween
th.
computer connected to
the
intodace
on~mrinchn~.id.(~withSWll,.tr.nwnicdon.pecifi~
tion
setting
witch,
ow
Section
4.3.2)
and
the
An1
C24.
2)
Used
by
a sequence program to check communications
status,
etc.
AJ71 C24 initializing after power
ON
or
OFF using protocol
1
to 4
xn4
to
xn6
1
Received station number
(sen)
ON ON
OFF
3
Received ENQ OFF ON
OFF 2
Waiting for
ENQ
ON OFF
OFF
Waiting for response from
PC
after receiving all data
5
Unused
ON
ON ON
7
Unused
OFF
ON
ON
6
Waiting for message ON
OFF ON
3-33
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