Mitsubishi Electric MELSEC Q Series User Manual page 244

Up to a time of up to one link scan may be required for refreshing the written data after execution of the QBF_ToBuf function.
(b) Manual cyclic data refresh
1) Execute the QBF_ToBuf function with "manual" specified for "CC-Link refresh method" of the third argument
(ulOffset).
2) Use the QBF_RefreshLinkDevice function to issue a refresh request.
3) In the timing of the next link scan, refresh is performed.
C Controller module
1)
2)
3)
• If data are written to the same address area before execution of the QBF_RefreshLinkDevice function, the
area will be overwritten with the data refreshed later.
By writing the data to another address area, both of the data can be written.
C Controller module
*1: Data written to the same address will be overwritten by the buffer memory, so
242
User
program
QBF_ToBuf (manual)
QBF_RefreshLinkDevice
User
program
QBF_ToBuf (manual) (1)
QBF_ToBuf (manual) (2)
QBF_RefreshLinkDevice function
data written later will be refreshed.
If data are written to another address area, both written data sets will be refreshed.
CC-Link module
Buffer memory Link scan
Refresh request
Refresh
CC-Link module
Buffer memory Link scan
Refresh request
Refresh
(Data (1) + (2)) *1
Link scan
Link scan
Link scan