WindO/I-NV4 User’s Manual 30-7
1 Overview
30
Expansion Modules
● Operation with priority on display processing
When an external input occurs
■ Display processing
Parts placed on the screen are processed in order from the top down. This process constitutes a single scan.
When processing reaches the end, it returns to the beginning and starts the next scan.
The time for one scan depends on the number and type of parts used, as well as how they are configured.
■ Input refresh
Inputs are refreshed every 10 ms independent of the screen scan.
However, inputs at the expansion module are not reflected in the Input (#I, #D and LEX) until the screens scan ends.
■ Input delay
When an external input occurs on the expansion module, the delay time until that input is reflected to the Input (#I,
#D and LEX) is as follows.
Minimum: 5 milliseconds
Maximum: 15 milliseconds + the scan time (HMI Special Data Register LSD4)
The longer display processing takes, the longer the delay.
Control processing
Expansion module input
Input
refresh
Input
External
input
External
input
10 ms
Input
refresh
10 ms
Input
refresh
10 ms
Scan time
Input delay
Input
delay
Start of scan
Display
processing
1 scan
(#I, #D, LEX)
End of scan
When the input refresh is executed immediately after starting the
scan, since the input of the expansion module is reflected at the
end of the scan of the screen, a wait time of about 1 scan occurs
and the input delay is maximized.
Input
External
input
Input
refresh
Display
processing
1 scan
(#I, #D, LEX)
Input delay
(maximum)
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