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Mitsubishi Electronics AJ61BT11 ユーザーズマニュアル

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4 - 10 
4   FUNCTIONS 
MELSEC-QnA 
 
4.4 Communication Between the Master Station and Local Station 
The overview of the communication between the master and local stations is 
described. 
 
Master station
Programmable controller CPU
Refresh instruction
Buffer memory
Remote input (RX)
Receive area from
local station No. 1
Receive area from
local station No. 2
to
Remote output (RY)
Send area to 
local station No. 1
Send area to 
local station No. 2
to
Remote register 
(RWw)
Send area to 
local station No. 1
Send area to 
local station No. 2
to
Remote register
(RWr)
Receive area from
local station No. 1
Receive area from
local station No. 2
to
Data link startup
by EEPROM 
parameters
SET Yn0
Local station (station No. 1)
Refresh instruction
Buffer memory
Remote output (RY)
Host (station No. 1)
send area
Receive area from
local station No. 2
to
Remote input (RX)
Receive area from
master station
Receive area from
master station
to
Remote register
(RWr)
Receive area from
master station
Receive area from
master station
to
Remote register
(RWw)
Host (station No. 1)
send area
Receive area from
local station No. 2
to
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
SET Yn8
FROM
FROM
TO
TO
TO
TO
FROM
FROM
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
Link scan
1
2
1
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POINT 
 
The master station sends only the data for the stations that have started the data link. 
The data for the stations that have not started the data link are not sent.