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MELSEC-Q
3 SPECIFICATIONS
(b) Link scan
Link scans can be performed synchronously with sequence scans of the
CPU module (END synchronization) or asynchronously with them (END
asynchronization).
Select END synchronization or END asynchronization, referring to the
following.
POINT
To set the END asynchronization, use the following master module and GX
Developer.
• Master module: First five digits of serial No. are "09012" or later.
• GX Developer: GX Developer Version 8.45X or later
1) END synchronization (Default)
The transmission delay time for output can be reduced.
When a sequence scan takes much longer than a link scan, however,
the transmission delay time for input is increased. (Refer to Section
3.3.2.)
2) END asynchronization
When a sequence scan takes much longer than a link scan, the
transmission delay time for input can be reduced.
However, the transmission delay time for output will be increased.
(Refer to Section 3.3.2.)
(c) I/O refresh and automatic refresh
These refreshes are performed in synchronization with link scans.
Master module
Link scan
I/O module
Intelligent function
module
I/O refresh
Automatic refresh
I/O refresh I/O refresh
Automatic refresh Automatic refresh