31.5.3
Standard Input (LT Series)
The microcomputer on the I/O board watches the input terminal
state at 0.5 millisecond-loop updates and writes the input state to
the I/F RAM when I/O is refreshed every 2 millisecond-loop
update.
When the digital input filter is set, data for sampling set at
the time of I/O refreshing is tracked back, and the result is
written in I/F RAM. The value written in I/F RAM is read each time
the LT is scanned.
In the [Standard I/O Settings] dialog box, when [Word] is
selected for [Type], for 32-bit variables allocated to I/O, the
lower 12 bits are used for the LT-3200 Series while the lower 16
bits are used for the LT-3300 Series.
Do not use unused areas of allocated variables (fix to 0). If a
value is updated for an unused area (for example, at 20 bit), it is
cleared on the next scan.
 31.5.3.2 Procedure - Standard
Input
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