Instruction manual

20 IMR01Y06-E6
6. CC-Link COMMUNICATION
6.1 Communication Between Master Station and COM-JC
(Remote Device Station)
The COM-JC which is a remote device station can process Remote input (RX), Remote output (RY)
and Remote registers (RWw and RWr).
 Outline of communication between master station and COM-JC (Remote device station)
CPU of PLC
Master station
COM- JC
(Remote device station)
Remote input
(RX)
Remote
register (RWw)
Link scan
Link scan
Link scan
Link scan
Buffer memory
[RUN/STOP
transfer, extension
No. setting, etc.]
[Measured value
(PV)]
[Set value (SV)]
[Event state, etc. ]
Network
parameters
Automatic refresh
parameters
X
Y
W
W
A
utomatic refresh
A
utomatic refresh
A
utomatic refresh
A
utomatic refresh
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)(9)
Network
parameters
Remote output
(RY)
Remote
register (RWr)
Remote input
(RX)
Remote output
(RY)
Remote
register (RWw)
Remote
register (RWr)
(1) When the PLC system is powered on, the network parameters in the
PLC CPU are transferred to the master station, and the CC-Link
system automatically starts up.
(2) The Remote input RX of a COM-JC (Remote device station) is
stored automatically (for each link scan) in the master station’s
Remote input RX buffer memory.
(3) The input status stored in the Remote input RX buffer memory is
stored in the CPU device set with the automatic refresh parameters.
(4) The ON/OFF data of the CPU device set with the automatic refresh
parameters is stored in the Remote output RY buffer memory.
(5) Remote output RY is automatically set to ON/OFF (for each link
scan) according to the output status stored in the Remote output RY
buffer memory.
[Data link startup]
[Remote input]
[Remote output]