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6. DATA COMMUNICATIONS USING AN
M : N MULTIDROP LINK
MELSEC-A
(8)
If no slave station obtains the access right, the master station transmits
broadcast datato all stations and obtains the access right and performs
data communications with PC CPUs.
The master station transmits the broadcast data to all computers after
(
completing data communications with PC CPUs to inform slave stations
of the completion of data communications with PC CPUs.
(An example of data communications using dedicated protocol 1)
stations
*
1
*1 The command symbols'M'
Master station
computer
the access right
(SOH)
master station and slave
and 'ZT in this example are
indicated only for explanation.
Use any desired symbol for
communications between the
OYI
~
~
~
&
i
~
~
number
(AOHI
4 1 ~ 1 m
F~~~ Lation
number
@OH1
3
8
~
1
~
~
C,lad
i n 1
~ 1 5 8 1 1
~ e r r a g s
wait time
( 0 1
3 3 1
sum :hssk
code
I B W
4 2 ~ 1 4 2 ~
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