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4   FUNCTIONS 

MELSEC-QnA 

 

4.5 Communication in Compound Systems 

The overview of the communication where the remote I/O station, remote device 
station and local station coexist in the system. 

 

SET Yn0

1

SET Yn8

2

5

Programmable controller CPU

Master station

Remote I/O station (station No. 1)

Buffer memory

Remote input (RX)

Remote output (RY)

Send area to 
local station No. 3
Send area to 
local station No. 4

Remote register

(RWw)

Remote register 

(RWr)

Data link startup
by EEPROM 
parameters

8

13

FROM

FROM

FROM

FROM

TO

TO

TO

TO

TO

TO

TO

FROM

FROM

FROM

Input

Output

3

7

11

12

12

Refresh instruction

Receive area 

from remote 

I/O station No. 1

Receive area 

from remote 

device station No. 2

Receive area from
local station No. 3
Receive area from
local station No. 4

Send area to remote
I/O station No. 1

Send area to remote
device station No. 2

Unusable 

(station No. 1)

Send area to remote
device station No. 2

Send area to 
local station No. 3
Send area to 
local station No. 4

Unusable 

(station No. 1)

Receive area 

from remote 

device station No. 2

Receive area from
local station No. 3
Receive area from
local station No. 4

13

13

8

8

6

6

6

6

5

5

5

3

3

3