Manual Cyclic Data Refresh; Readout Operation - Mitsubishi Electric Q12DCCPU-V User Manual

5
ACCESS VIA NETWORK MODULES
(b) Manual cyclic data refresh
1) Use the QBF_RefreshLinkDevice function to issue a refresh request.
2) The user program is continued.
3) Data are refreshed by the request in 1).
4) Execute the QBF_FromBuf function with "manual" specified for "CC-Link
refresh method" of the third argument (ulOffset).
Cyclic data (in the buffer memory) are read out.
C Controller module
User program
1)
QBF_RefreshLinkDevice function
2)
3)
QBF_FromBuf function (Manual)
4)
Reading data *1
QBF_FromBuf function (Manual)
4)
Reading data *1
*1 The same refresh data are read out.
• If execution of the QBF_FromBuf function is attempted before refreshing data
by the QBF_RefreshLinkDevice function, user program processing is
suspended until completion of the refresh.
Upon completion of the refresh, cyclic data (in the buffer memory) are read
out, and the user program processing resumes.
C Controller module
User program
1)
QBF_RefreshLinkDevice function
2)
QBF_FromBuf function (Manual)
4)
3)
Reading data
: User program is in standby state.
CC-Link module
Buffer memory
Refresh request
Figure 5.3 Readout operation
CC-Link module
Buffer memory
Refresh request
Figure 5.4 Readout operation
5.2 CC-Link Module Access Function
5.2.1 Block data assurance per station
Link scan
Link scan
Refresh
Link scan
Link scan
Link scan
Link scan
Refresh
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