Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 157)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
6-38
High speed counters require filter adjustment. The input filter response time is the time
from when the external input voltage reaches an on or off state to when the MicroLogix
1000 controller recognizes that change of state. The higher you set the response time,
the longer it takes for the input state change to reach the MicroLogix controller.
Higher response times provide better filtering of high frequency noise.
When you press [F6] from the Configuration for Project menu, you will see the
following screen.
You can apply a unique input filter setting to each of the three input groups. When you
press [F1] , [F2] , or [F3] , you will be shown a list of response times to choose from.