2.
SYSTEM
CONFIGURATIONS
MELSEC-A
2.3.4
2
:
n
rrtlo
external
to
PC
kPu8
(1)
The system configuration for a
2
:
n (up to
32
stations) ratio of external
devices (such as a computer) to
PC CPUs
is shown
in
Fig.
2.5
below.
(Mode:
[
]
to
[
I)
in
the figure indicates the range of setting set with the
mode setting switch of an
AJ7lC24
(see Section
4.3.1).
(A
combination of
two
systems one of which has a
1
:
1
configuration and the other has a
i
:
n
configuration.)
'OINTS
I
(1)
One of the
two
interfaces of the
AJ71C24
which is connected to the
external devices is set to a dedicated protocols
1, 2, 3,
or
4.
The
other
is
set to a
no-protocol/bidirectional
mode.
(2)
When the mode setting is
5
to
8,
the
RS-232C
interface which
is
not
used for the multidrop link can be used for communications with a
computer, a printer, or a
CRT
in
a
no-protocol/bidirectional
mode.
(3)
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.
2.5
System
Conflguratlons
(IV)
2-13
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