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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 stationProgrammable 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
4
4 4
5
5
7
7
8
8
10
10
15
15
14
14
11
11
14
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.