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1 OVERVIEW
MELSEC-QnA
1.3.2 Communication between the master station and remote device station
The overview of the communication between the master station and remote device
station is described below.
Refer to Section 4.3 for details.
station is described below.
Refer to Section 4.3 for details.
SET Yn0
SET Yn6
1
2
FROM
4
Refresh instruction
Data-link startup
Remote input
(RX)
Buffer memory
Link scan
Programmable controller CPU
Master station
Remote device station
Remote input
(RX)
3
TO
5
Remote output
(RY)
Link scan
Remote output
(RY)
6
TO
7
Remote register
(RWw)
Link scan
Remote register
(RWw)
8
FROM
10
Remote register
(RWr)
Link scan
9
Remote register
(RWr)
1
Turn on the refresh instruction.
2
Startup the data link.
3
By the link scan, the remote device station's remote input (RX) is stored in the
master station's remote input (RX).
4
By the FROM instruction, read data from the remote input (RX).
5
By the TO instruction, write data to the remote output (RY).
6
By the link scan, the remote device station's remote output (RY) is turned on/off.
7
By the TO instruction, write data to the remote register (RWw).
8
By the link scan, the data is sent to the remote device station's remote register
(RWw).
9
By the link scan, the remote device station's remote register (RWr) is sent to the
master station's remote register (RWr).
10
By the TO instruction, read data from the remote register (RWr).