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1 OVERVIEW
MELSEC-QnA
1.3.3 Communication between the master station and local station
The overview of the communication between the master station and local station is
described below.
Refer to Section 4.4 for details.
Refresh instruction
1
Data link startup
2
Buffer memory
Remote input (RX)
Remote output (RY)
Remote register (RWw)
Remote register (RWr)
Master station
Refresh instruction
1
Buffer memory
Remote output (RY)
Remote input (RX)
Remote register (RWr)
Remote register (RWw)
Local station
Refresh instruction
1
Buffer memory
Remote output (RY)
Remote input (RX)
Remote register (RWr)
Remote register (RWw)
Local station
Link scan
3
Link scan
4
Link scan
5
Link scan
6
Link scan
3
Link scan
4
Link scan
5
Link scan
6
1
Turn on the refresh instruction.
2
Startup the data link.
3
By the link scan, the data in the local station's remote output (RY) is sent to the
master station's remote input (RX) and other local stations' remote output (RY).
4
By the link scan, the data in the master station's remote output (RY) is sent to all
local station's remote input (RY).
5
By the link scan, the data in the master station's remote register (RWw) is sent to all
local stations' remote register (RWr).
6
By the link scan, the data in the local station's remote register (RWw) is sent to the
master station's remote register (RWr) and other local stations' remote register
(RWw).