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6.
DATA COMMUNICATIONS USING AN M : N MULTIDROP 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
all
computers.
Computer with
the access right
(8W
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.
' 1 Station number for transmission
to all computers (broadcasting).
*2
See ' I in previous figure.
C6H
To
r k m
Fmm :tation
WHI
(SJW
izz)
41H13fn
SY1133H
W 1 5 A H
Me9lage
wait time
(0)
3X1
Sum :hack
code
icon)
r W 1 3 0 n
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