6.
DATA COMMUNICATIONS USING
AN
..
M
:
N
MULTIDROP
LINK
MELSEC-A
6.2.2
Maximum
data
communicrtknr
tlnn
per
computw
Set
the maximum time
so
that, after obtaining an access right, each com-
puter can perform data communications with
PC CPUs.
(In the following figure, each of these
H
means time duration.)
Even
if
the computer that obtains the access right malfunctions, data com-
munications can be done between other computers and
PC CPUs
by setting
the maximum data communications time.
DOINTI
Set
the
maximum data communications time per computer to a time that
is sufficient for data communications
with
PC CPUs
in the computer link
system.
After the computer link system starts, the computer that obtains the
access right must complete data communications with
PC CPUs
within the
maximum data communications time.
When unable
to
complete data communications, the computer with
'
the access right transmits the
CL
code to communicating
PC CPUs
within the maximum data communications time, and initializes a
\
transmission sequence to an AJ71
C24.)
I
While a computer and
PC CPUs
are performing data communications, the
time-out check function must be used with other computers to block data
transmission from those computers.
6-3
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