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Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 3
Input Module Features
Input Filter with Compact 5000 I/O Fast Input Modules
On the Compact 5000 I/O fast input modules, the input filter not only helps
to improve noise immunity in a signal but also to help prevent rapid changes of
the input data due to contact bounce.
The input filter time defines how long an input signal transition must remain
in the new state before the transition is valid and the input changes state. Input
and Event timestamps are only recorded with valid transitions.
A transition is only valid if the input signal remains in the new state for the
entirety of the filter duration. If the input changes state again before the chosen
input filter time elapses, the transition is not valid.
, the first three signal transitions--both On to Off and Off to On--
remain the same state until the filter time elapses and are not valid.
Figure 10 - Input Filter Usage on Compact 5000 I/O Fast Input Modules
IMPORTANT
• This description applies to 5069-IB16F and 5069-IB6F-3W modules, and
to any 5069-IB16 module that uses firmware revision 2.011 and earlier.
• The input filters work the same whether the transition is a simple state
transition or when the state transition triggers an Event.
Input Signal
ON
OFF
ON
OFF
End
Start
Filter Duration
Module Input Data
State Change
State Change
ON to Off Filter Timestamp Value
Input Signal
ON
OFF
ON
OFF
End
Start
Filter Duration
Module Input Data
Off to On Filter Timestamp Value
Off to On Filter
On to Off Filter