Mitsubishi Electric Q06CCPU-V, Руководство пользователя

Страница: 162 / 618

5
- 8 5.2 CC-Link Module Access Function
5.2.1 Block data assurance per station
5
ACCESS VIA NETWORK MODULES
(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.
• 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.
Figure 5.7 Write operation
Figure 5.8 Write operation
Buffer memory
Link scan
C Controller module CC-Link module
Refresh
Link scan
QBF_ToBuf function (Manual)
QBF_RefreshLinkDevice function
1)
2)
3)
Refresh request
Link scan
User program
Buffer memory
Link scan
C Controller module CC-Link module
Refresh
(Data 1) + 2))*1
Link scan
Refresh request QBF_RefreshLinkDevice function
QBF_ToBuf function (Manual) 1)
QBF_ToBuf function (Manual) 2)
*1 Since writing these data to the same address overwrites the area in the buffer memory,
newly written data are refreshed.
If written to different addresses, both data are refreshed.
User program