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3. SPECIFICATIONS
MELSEC-A
3.4
1 1 0
Signals List for CPU
The I10 signals of the
AJ71C24
for the
PC CPU
are listed below. The
numbers (n number) appended t o X and Yare determined by the installing
position of the
AJ71 C24
and the number of I/O signals used by the
I10
signal
signals used by the
I10
modules installed in front of the
AJ71C24.
(Example:
XnO
+
X O when the
AJ71 C24
is loaded in slot 0 of the main base unit)
(1)
lnput signals
(AJ71C24
-.
PC CPU)
There are
16
input siqnals: XnO t o XnF are turned ON/OFF bv the
-
n p u t
i g n a l
-
XnO
-
Xn1
-
Xn2
-
Xn3
-
xn4
to
Xn6
Signal
Name
Send
completed
Received
data read
request
Global
signal
On-
demand
function
operating
AJ71C24
message
sequence
state
Table
3.5
lnput Signals
List
Description
Referencr
Sections
Turns ON when the send from the AJ71C24 t o the external
O
I
device is completed when Y(n+l)O is turned ON.
9.2, 10.2
Turns OFF when Y(n+l)O is turned OFF.
Turns ON when the completed code, fixed length data, or desig-
O
I
nated data length is received from the external device. Turns
9.2, 10.2
OFF when Y ( n + l ) l is turned ON.
Turns ONIOFF according t o the message (factor number) when
a
-
1
global command is received from a computer.
/
8.13
~
Turns ON when the on-demand transmission is executed accord-
-
I
ing to the request from the sequence program. Turns OFF when
the on-demand transmission is completed.
(1)
Set values '1' to '8' of the mode setting switches (see Section 4.3.1)
indicating the state of communications between the computer con-
nected to the interface on the dedicated protocol side and the
AJ71C24.
I
Set
values
'A'
to
'D'
of the mode setting switches indicating the state
of communications between the computer connected to the interface
I
on the main channel side (set with SW11,
a
transmission specifica-
tion setting switch, see Section 4.3.2) and the AJ71C24.
Used by
a
sequence program to check communications status, etc.
Value
Xn6
Xn5
Xn4
Message Sequence State
OFF
OFF
OFF AJ71C24 initializing after power
O N
or
OFF using protocol 1 to 4
1
I
OFF
/
OFF
/
ON
I
Waitina for ENQ
2
OFF
ON
OFF
Received ENQ
3
1
OFF
/
ON
/
ON
I
Received station number Iselfl
ON
OFF
OFF
Waiting for response from PC
1 4 1 I I I
after receiving all data
1
5
1
ON
/
OFF
I
ON
I
Waitina for messaae
6
ON
ON
OFF
Unused
7
1
ON
I
ON
I
ON
I
Unused
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