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8   PROGRAMMING 

MELSEC-QnA 

 

8.3.3 Communication between the master station and local station 

The basic procedure for creating a program to communicate with local station is shown 
below. 
Refer to Chapter 11 for a program example. 

 

(1)   Master station 

 

.........Yn0

.........Yn0

.........Yn8

.........Yn6

.........YnA

For debugging only 

 

For operation only

Parameter setting

Refresh instruction

Data link startup by the buffer-memory  
parameters 

Refresh instruction

.........Buffer memory address 0

H

 to 5F

H

PROM 

Parameter registration to E

2

Data link startup by the E PROM  
parameters

2

Read from remote input (RX)

Read from remote register (RWr)

Control by the read remote input (RX) 

 

Control by read data from remote register
 (RWr)

Create data to write to remote register
(RWw)

ON/OFF control of remote output (RY)

Write to remote register (RWw)

Write to remote output (RY)

.........Buffer memory address E0

H

 to 15F

H

.........Buffer memory address 1E0

H

 to 2DF

H

.........Buffer memory address 160

H

 to 1DF

H

.........Buffer memory address 2E0

H

 to 3DF

H