Mitsubishi MELSEC Q Series User Manual

4
FUNCTIONS
4.3 CC-Link Module Access Function
4.3.1 Block guarantee of cyclic data per station
4 - 12
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
SETTING AND PROCEDURES
6
I/O NUMBER ASSIGNMENT
7
MEMORIES AND FILES
8
INSTALLING / UNINSTALLING
• If execution of the QBF_ToBuf function is attempted before completion of
the previous refresh, data writing will not start until completion of the
refresh.
POINT
A time of up to one link scan may be required from execution of the QBF_ToBuf
function until refresh of written data.
(b) Manually refreshing cyclic data
1) Execute the QBF_ToBuf function with "manual" specified for "The link
refreshing method of the CC-Link link" of the third argument (ulOffset).
2) Issue a refresh request with the QBF_RefreshLinkDevice function.
3) At the timing of the next link scan, data are refreshed.
Figure 4.7 Write operation
Figure 4.8 Write operation
Buffer memory
Link scan
C Controller module CC-Link module
Link scan
:User program is in standby state.
QBF_ToBuf function (Auto)
Writing data 1)
Link scan
Refresh request 1)
Refresh
(Data 1))
Refresh request 2)
Refresh
(Data 2))
QBF_ToBuf function (Auto)
Writing data 2)
User program
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

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English