6.
DATA COMMUNICATIONS
USING
AN
M
:
N MULTIDROP
LINK
MELSEC-A
6.3.2
Data
communiwtims
with
PC
CPU8
by
uttlng
8
master
station
and
skve
station0
One
of
the computers is set as a master station and the other computers are
set as slave stations which need the approval of the master station to
perform data communications with PC CPUs.
can.
Slm
&tion
computer
m-l
1
Dd.
Wmmvliutionr
I
WithPCCRlS
-
The following example shows how each computer performs data com-
munications
with
PC CPUs.
After the start of data communications between a computer and PC CPUs,
each computer executes the time-out check of the maximum data com-
munications time.
A
computer at a slave station that is not performing data communications
with a PC CPU checks the communications completed code which
is
trans-
mitted from the computer when
it
has completed data communications with
PC CPUs.
In
the following figure, the computer at the minimum station number
80H
is
set as the master station and other computers are set as slave stations.
+
:
Computers with the access right
-.
1
Lj
number
874
r
number
88H)
7
1
I
3
Computer
(sbtion
number
~OHJ
J
6-8
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