6.
DATA COMMUNICATIONS USING AN
M
:
N MULTIDROP LINK
MELSEC-A
6.3
Procedure
for
D8t8 Communicrtionr with
8
PC CPU
This section explains the procedure for computer interlocking and data
communications with a PC CPU when constructing an m
:
n multidrop link.
6.3.1
Communicrtlons between
each
computer and PC CPUs
Each computer obtains the access right (one after another according to the
order of the station number
of
each computer) and then does data com-
munications with PC CPUs.
The following example shows the procedure for data communications
between each computer and PC CPUs.
+
:
Computer with the access right
(1)
When starting a system, the computer allocated with the minimum
station number
(80H)
obtains the access right.
(2)
The computer which has the access right:
(a) Performs data communications with PC CPUs within the maximum
data communications time set among computers, and then, starts
procedure
(4).
(b) Starts procedure
(4)
if
it
does not perform data communications
with PC CPUs.
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