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4. SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
(4) Write during RUN
Computer
lo PC CPU
Ratio
1 : 1
1 : n
m : n
Set whether a processing requested by the external device is executed
or not executed by the PC CPU in the RUN state when the computer link
operates with the dedicated protocol.
Section 3.3.1 gives the functions available with this setting.
(5) Terminal resistance at send and receive
When using the RS-422 cable, set the terminal resistance to "Present" at
the stations connected to the both sides of the station which is linked
with the RS-422 cable.
If this setting is not correct, normal computer link operations cannot be
done.
The following chart shows examples of settings. Shaded boxes indicate
the stations where terminal resistance needs to be set, and white boxes
indicate the stations where terminal resistance need not be set. (Appen-
dix
6
gives the settings to be done on the computers.)
System
Configurations
Computer
R8422
IS-232C
. !
- -
Setting
Wherl
Re
Need
-
SW23
-
ON
-
ON
ON
ON
571 0 2 4
minal
nce
be Set
SW24
ON
ON
ON
Computer
Computer
RS.422
OFF
or
OFF
ON
(Set either to ON)
I
Computer
I
r - - -
- I
C24
I I
I I
1
C24
C24
C24
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