Mitsubishi Electric Q80BD-J61BT11N, User Manual

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MELSEC
4 FUNCTIONS
(2) Access method for link devices
The access method varies from the user program to the link device depending on
the setting of block data assurance per station.
(a) In the case of block data assurance per station is disabled
Accessing (reading/writing) the data from the user program is directly
carried out with respect to the link device of CC-Link Ver.2 board.
To prevent separation of the data, it is necessary to implement the data
separation prevention function in the user program.
This explains the case where personal computer transmits the data (RY0)
to programmable controller (X0) cyclically.
1) The link device RY0 of the CC-Link Ver.2 board on the sending side
(personal computer) becomes ON when the user program turns ON the
RY0.
2) By a link scan, the link device data (RY0) is stored in a link device (RX0)
of CC-Link system master/local module on the receiving side.
3) By a link refresh, the data (RX0) is stored in a device (X0) of the CPU
module.
RY X RX
Sending side (personal computer) Receiving side (programmable controller)
Link device
Link
refresh
User
program
Link device Device
CPU module CC-Link
master and local
module
1) RY0 turns ON.
2)
Write
CC-Link Ver.2 board Personal computer
Link scan
3)