Communication Data; Communication Data Flow - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
16 External PLC link
16.1 CC-Link

16.1.3 Communication Data

16.1.3.1 Communication Data Flow

The flow of data communicated by the CC-Link's link scan is as follows.
(The master station and local station of MELSEC CPU can be also mixed.)
NC (Master station)
Built-in PLC
Devices
RX
X device, etc.
RY
Y device, etc.
RWr
R device, etc.
RWw
R device, etc.
(1) By executing a link scan, data in the remote I/O station, and remote device station's remote input (RX) and local station's
remote output (RY) are transmitted to the master station's remote input (RX) and the local station's remote output (RY).
(2) By executing a link scan, data in the master station's remote output (RY) is transmitted to the remote I/O station and
remote device station's remote output (RY) and the local station's remote input (RX).
(3) By executing a link scan, data in the remote device station's remote register (RWr) and the local station's remote register
(RWw) is transmitted to the master station's remote register (RWr) and the local station's remote register (RWw).
(4) By executing a link scan, data in the master station's remote register (RWw) is transmitted to the remote device station's
remote register (RWw) and the local station's remote register (RWr).
Remote device
Local station
station
(1)
(1)
RY
RX
(2)
(2)
RX
RY
(3)
(3)
RWw
RWr
(4) (4)
RWr
RWw
Transmission data
913
NC (Local station)
Remote I/O
station
(1)
(1)
RY
RX
(2)
(2)
RX
RY
(3)
(3)
RWw
(4)
(4)
RWr
<Flow of data>
Link scan
Automatic refresh
(When master station/local station is NC.)
Built-in PLC
Devices
Y device, etc.
X device, etc.
R device, etc.
R device, etc.
IB-1501668-B