Mitsubishi LJ61BT11 User Manual page 23

(3) Local station communication
Programmable
controller CPU
Automatic refresh
X
Automatic refresh
Y
Automatic refresh
W
Automatic refresh
W
Programmable
controller CPU
G(P).RIWT
G(P).RIRD
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The local station is a station having a programmable controller CPU and the
ability to communicate with the master and other local stations.
Communication between a master station and a local station uses two types of
transmission methods: cyclic transmission and transient transmission (refer to
Section 8.1.3).
(a) Cyclic transmission
Data communication between programmable controller CPUs can be
performed in N:N mode using bit data (remote input RX and remote output
RY) and word data (remote registers RWw and RWr).
Master station
Remote
Link scan
input
(RX)
Remote
Link scan
output
(RY)
Remote
Link scan
register
(RWw)
Remote
Link scan
register
(RWr)
(b) Transient transmission
Read (G(P).RIRD) or write (G(P).RIWT) operation of the local station buffer
memory and CPU device can be performed at any timing.
Master station
Transient transmission
Transient transmission
Transient
transmission
Transient transmission
area
Transient transmission
Local station
Remote
Automatic refresh
output
(RY)
Remote
Automatic refresh
input
(RX)
Remote
Automatic refresh
register
(RWr)
Remote
Automatic refresh
register
(RWw)
Local station
Transient
transmission
area
Buffer
memory
1 CC-Link SYSTEM
Programmable
controller CPU
Y
X
W
W
Programmable
controller CPU
W
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