2.
SYSTEM
CONFIGURATIONS
>.
MELSEC-A
2.3.2
1
:
n
ratio
of
l
extemal
dmflce
to
PC
CPUs
(1)
The system configurations for
a
1
:
n (up to
32
stations) ratio of an
external device (such as a computer) to
PC CPUS
are shown
in
Fig.
2.3
below.
(Mode:
[
]
to
[
1)
in
the figure the range of setting set with the mode
setting switch of an
AJ71 C24
(see Section
4.3.1).
[System configuration
11
The external device is connected to the
AJ71C24
modules using
the
RS-232C
dovice
(computer)
Rspx
interface
___--
RE422
interface R5422cable
RE422
interface
RE422mbk
R5422
interface
Maximum
of
32
stations
[System configuration
21
The external device is connected to the
AJ71 C24
modules using
the
RS-422
E422
intedace Computer
link
modules
~OINTS
I
(1)
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.
(2)
Use of the
RS-232C
and the
RS-422
interfaces differs in that the
RS422
is used to connect long distances (up to
500
m
(1640.5
ft))
and the
RS-232C
is used to connect short distances (up to maximum
of
15
m
(49.2
ft)).
(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.
2.3
System Configurations
(11)
2-7
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