6.
DATA
COMMUNICbTIONF
USINGAPS
y
:
N
h&JLTIDROP
LINK
MELSEC-A
(7)
When the access right time
of
a computer with the access right exceeds
the maximum data communications time
(a) The computer at the next station number transmits broadcast data
to all computers, obtains the access right, and executes the
processing mentioned in
(2).
(An example
of
data communications using dedicated protocol
1)
(b)
Other computers check
if
they received
the
data transmitted to ail
computers.
Computers which received the data execute the processing men-
tioned in
(3).
If
a computer failed to receive the data, the next computer transmits
data to all computers, obtains the access right, and executes the
processing mentioned in
(2).
Other computers execute the check mentioned above.
6-7
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