Hardware manual

LT Description
46
Input Management
Overview
LT is equipped with Standard Inputs and Fast Inputs. You can manage the input
values using the software filter function that eliminates the input signal noise.
This section explains the filter concept using Fast Input as an example.High
-speed
Counter Input and Pulse Catch Input can be managed as Special Input and Output.
Filter Principle of Special I/O
The filter is designed to reduce the bouncing effect at the inpu
ts. S
etting a filter value
allows the controller to ignore sudden changes of input levels caused by noise.
The following timing diagram illustrates the filt
er effects: