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Chapter 3
Input Module Features
Off to On Filter
On to Off Filter
86
Input Filter with 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.
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.
In
Figure
10, 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
ON
Input Signal
OFF
End
Filter Duration
Start
ON
Module Input Data
OFF
ON
Input Signal
OFF
End
Filter Duration
Start
ON
Module Input Data
OFF
Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
State Change
Off to On Filter Timestamp Value
State Change
ON to Off Filter Timestamp Value
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