Mitsubishi Electric MELSEC Q Series User Manual page 245

• If data writing is attempted before completion of the refresh after execution of the QBF_RefreshLinkDevice
function, the data will be not written until completion of the previous refresh.
C Controller module
User
program
QBF_ToBuf (manual) (1)
QBF_RefreshLinkDevice
QBF_ToBuf (manual) (2)
QBF_RefreshLinkDevice
: User program is waiting
When any of the following operations is performed for the CC-Link module for which the block data assurance per station
is enabled, cyclic data are automatically refreshed even if the QBF_RefleshLinkDevice function is not executed.
• Forced writing to the buffer memory on Setting/monitoring tools for the C Controller module.
• Device writing in Setting/monitoring tools for the C Controller module.
• Device writing from another user program (another task) with the QBF_ToBuf function (automatic refresh method)
or a MELSEC data link function
Note that the read (receive) area of the link refresh device (in the buffer memory) is not refreshed.
Also, cyclic data are not refreshed when device writing is performed with another station's CC-Link module specified in
Setting/monitoring tools for the C Controller module.
CHAPTER 13 FUNCTIONS ACCESSED VIA A NETWORK MODULE
CC-Link module
Buffer memory
Link scan
Refresh request
Refresh
(Data (1))
Refresh request
Refresh
(Data (2))
Link scan
Link scan
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