2.
SYSTEM CONFIGURATIONS
MELSEGA
2.3.5
m
:
n
ratio
of
extemal
devices
to
PC
CPUs
(1)
The system configuration for
a
m
:
n
(up to
32
stations) ratio
of
external
devices (such as a computer) to
PC CPUs
is shown in Fig.
2.6
below.
(Mode:
[
1,
[
1,
[
1)
in the figure indicates setting set with the mode setting
switch of an
AJ71C24
(see Section
4.3.1).
*
set
all
AnlC24s
to
the
samo
protocd.
I
i
External
dm
(computer)
141
e:
Computer link module
00
I
RS422’cable
RS-422
interface
Maximum
of
32
stations
SOINTS
I
(1)
All
the external devices and
AJ71C24
modules are connected to form
a multidrop link in the above example which uses dedicated protocols
1,
2,
or
4.
The multidrop link
of
the m
:
n ratio system configuration
cannot use dedicated protocol
3.
When multiple external devices and
AJ71C24
modules are used to
form a multidrop link, the procedure to exercise the access right with
a
specific station should be provided.
(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
AJ71C24.
Fig.
2.6
System Configurations
(V)
2-16
i
1.J
a
Y
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