4.
SmiNGS
AND
PROCEDURES BEFORE
OPERATlON
MELSEC-A
4.5.4
Conndng
a
multidrop
link
and
setting
modes
and
terminrl
rwldrncs
The following gives an example of the multidrop link which consists of com-
puters and
AJ71C24
modules.
Sections
4.5.2
and
4.5.3
explain the connection of the signal cables which are
not shown in the figure.
(SW23:
[
),
SW24:
[
1)
shown above the
AJ71C24
indicate the terminal
resistance settings.
(Mode:
[
]
to
[
),
Main:[
I)
shown below the
AJ71C24
indicate the ranges
of
the mode setting switches and the interface setting with the main channel
setting switch (only for related stations) when a multidrop link is constructed.
Values in
(
)
on the top
row
are for the dedicated protocol. Those on the
bottom row are for the no-protocol mode.
Mode:
[
]
to
[
]
....
Setting range of the mode setting switch for that station
(see Section
4.3.1).
Main:
[ ]
....
The interface on the main channel setting
of
that station (see
Section
4.3.2).
Only those for related stations are shown.
Set
the terminal rerirtancm
of
the stations which
810
connected
to
both ends
of
thm RS-422 line
to 'Enable' when a multidrop link
is
constructed.
-1
c1
d
1
Y
-
I
1
(I) 1
:
n connection ratio
-7
,;
4
(a)
A
computer and station
0
AJ71C24
are connected through the
RS-
.-.
232C port:
(sw24
:
OFF)
SW23
:
OFF
---
SD
SDA
SDB
RDA
w)
RD RDB
SG
bdicated (Modes:
A
to D Main: RS-232C)
Dedicated (Modes:
5
to
8)
Dedicated (Modes:
5
to
8)
No-protocol (Mode
:
9
Main: RS-232C)
No-protocol (Modes:
1
t0
4)
NO-protocol (Modes:
1
to
4)
L
4-
14
?
L
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
