31.5.3.2 Procedure - Standard InputThe 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 31.5.3.1 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 display unit is scanned.
In the [Standard I/O Settings] dialog box, when [Variable] is selected for [Type], the following is used for 32-bit variables allocated to I/O.
LT-3200 Series: Lower 12 bits
LT-3300 Series or STC6000 Series: Lower 16 bits
LT4000 Series (DIO model): Lower 20 bits
LT4000 Series (analog model): Lower 12 bits
Fix to 0 for unused areas of allocated variables. If a value is updated for an unused area (for example, bit 30), it is cleared on the next scan.