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4.
SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
4.5.4
Connecting a multidrop link and setting modes and terminal resistance
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: [ 1, SW24: [ 1) shown above the AJ71C24 indicate the terminal
resistance settings.
(Mode: [ ] to [
1,
Main:[ 1) 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 resistance of the stations which are connected to both ends of the RS-422 line
to "Enable" when a muhidroo link is constructed.
(1)
1 : n connection ratio
(a) A computer and station
0
AJ71C24 are connected through the RS-
232C port:
Dedicated
(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
to 4)
No-protocol (Modes:
1
to 4)
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