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4 - 5 

4   FUNCTIONS 

MELSEC-QnA 

 

4.3 Communication Between the Master Station and Remote Device Station 

The overview of the communication between the master station and remote device 
station is described. 

 

SET Yn0

SET Yn8

FROM

TO

TO

FROM

Programmable controller CPU

Master station

Refresh instruction

Data link startup 
by EEPROM 
parameters

Remote input 

(RX)

Remote input 

(RX)

Remote output 

(RY)

Buffer memory

Remote output 

(RY)

Remote device station

Link scan

Link scan

Remote register 

(RWr)

Remote register 

(RWr)

Link scan

Remote register 

(RWw)

Remote register 

(RWw)

Link scan

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