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

5
ACCESS VIA NETWORK MODULES
5.2 CC-Link Module Access Function
5.2.1 Block data assurance per station
5 - 5
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
ACCESS VIA NETWORK MODULES
6
PREPARATORY PROCEDURES AND SETTING
7
I/O NUMBER ASSIGNMENT
8
MEMORIES AND FILES
(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.
• 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.
Figure 5.3 Readout operation
Figure 5.4 Readout operation
Buffer memory
Link scan
C Controller module CC-Link module
Refresh
Link scan
Reading data *1
QBF_RefreshLinkDevice function
QBF_FromBuf function (Manual)
QBF_FromBuf function (Manual)
Reading data *1
1)
2)
4)
4)
*1 The same refresh data are read out.
Refresh request
3)
Link scan
Link scan
User program
Buffer memory
Link scan
C Controller module CC-Link module
Refresh
Link scan
Refresh request
QBF_RefreshLinkDevice function
QBF_FromBuf function (Manual)
Reading data
: User program is in standby state.
1)
2)
4)
3)
User program