2.
SYSTEM CONFIGURATIONS
MELSEC-A
2.3
System Configurations and Available Function*
The
AJ71C24
is
a link module to connect an external device (such as a
computer) and a
PC CPU.
The system can consist
of
a
single external device
and from
1
to
32 PC CPU
stations
(1
:
1
to
32
ratio system) or two external
devices and from
1
to
32 PC CPU
stations
(2
:
1
to
32
ratio system). The
connection may be made
in
two ways: using the
RS-232C
port or the
RS-422
port.
2.3.1
1
:
1
ratio
of
an external
device
(computer)
to
a
PC
CPU
(1)
The system configuration for a
1
:
1
ratio of an external device (such as
a computer) to a
PC CPU
is shown in Fig.
2.2
below.
(Mode:
[
]
-
[
1)
in the figure indicates the range of setting set with the
mode setting switch of an
AJ71C24
(see Section
4.3.1).
.1(
External
device
(such
as
a
computer,
To ex?
(Mode:
1
to
8)
Computer link
module
AJ71
C24
POINTS
I
(1)
Use of the
RS-232C
and the
RS-422
interfaces differs
in
that the
RS-422
is used to connect long distances (up
to
500
m
(1640.5
ft))
and the
RS-232C
is used to connect short distances (a maximum of
15
m
(49.2
ft)).
(2) To
have the
RS-232C
communicate over a distance greater than
15
m
(49.2
ft),
use a modem
or
RS-232C/RS-422
converter between the
external device and the
AJ71 C24.
Fig.
2.2
System Configurations (I)
d
I
d
-.
3
1
?,
'1
U
3
I(
4
2-4
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