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1 OVERVIEW
MELSEC-QnA
1.3.4 Compound system communication
The overview of compound system communication with remote I/O stations, remote
device stations, and local stations is described below.
Refer to Section 4.5 for details.
Refresh instruction
1
Master station
Data link startup
2
Buffer memory
Remote input (RX)
Remote output (RY)
Remote register (RWw)
Remote register (RWr)
Refresh instruction
1
Local station
Buffer memory
Remote output (RY)
Remote input (RX)
Remote register (RWr)
Remote register (RWw)
Input
Remote input (RX)
3 3 3
Output
Remote output (RY)
4 4 4
Remote register (RWw)
5 5 5
Remote register (RWr)
6 6 6
Remote I/O station
Remote device station
1
Turn on the refresh instruction.
2
Startup the data link.
3
By the link scan, data in the remote I/O station's and remote device station's remote
input (RX) and local station's remote output (RY) is sent to the master station's
remote input (RX) and local station's remote output (RY).
4
By the link scan, data in the master station's remote output (RY) is sent to the
remote I/O station's and remote device station's remote output (RY) and local
station's remote input (RX).
5
By the link scan, data in the master station's remote register (RWw) is sent to the
remote device station's remote register (RWw) and local station's remote register
(RWr).
6
By the link scan, data in the remote device station's remote register (RWr) and local
station's remote register (RWw) is sent to the master station's remote register (RWr)
and local station's remote register (RWw).