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4.
SElTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
4.3.3
Station number setting
The station number is set on all AJ71C24s so that the computer knows which
AJ71C24 to access in a 1
:
n ratio computer link system.
Station Number
Setting Switches
I
(m : n ratio)
Description
( I ) Set the station number in the range 0 to 31.
(Never set a station number to more than 32.)
(2) Set the X I 0 switch to the number of tens in the station number.
(3) Set the X I switch to the number of units in the station number.
(4) The station number may be set to any value which does not
duplicate another station number. it is not necessary to consider
the order of connection when viewed from the computer. Station
numbers do not have to be sequential and may be skipped.
(5)
if the switches are set as shown on the left, the station number is
25.
(1 : n ratio)
I
Computer
1
PJ71C24
I
(1) Use caution not t o set a station number which duplicates another station
number. This leads to destruction of transmission data and precludes
I
correct data communications
I
(2) When the computers and AJ71C24 modules are linked in an m
:
n ratio,
set station numbers only for the AJ71C24s.
Set the station numbers for the computers t o perform communications
between them. Setting range is 128 (80H) t o 159 (9FH). (See Section
6.2.1).
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