Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 390)

Appendix A
Hardware Reference
A–6
Input Filter Response Times (Discrete)
The input filter response time is the time from when the external input
voltage reaches an on or off state to when the micro 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 micro controller. However, setting
higher response times also provides better filtering of high frequency noise.
You can apply a unique input filter setting to each of the three input groups:
•
0 and 1
•
2 and 3
•
4 to x; where x=9 for 16 I/O point controllers, and x=19 for 32 I/O point
controllers
The minimum and maximum response times associated with each input filter
setting can be found in the tables that follow.
Response Times for High-Speed dc Inputs 0 to 3 (applies to
1761-L10BWA, 1761-L16BWA, -L20BWA-5A, -L32BWA, -L10BWB,
-L16BWB, -L20BWB-5A, -L32BWB, -L16BBB, and -L32BBB
controllers)
Maximum High-Speed
Counter Frequency @ 50%
Duty Cycle (Khz)
Nominal Filter
Setting (ms)
Maximum ON
Delay (ms)
Maximum OFF
Delay (ms)
6.600 0.075 0.075 0.075
5.000 0.100 0.100 0.100
2.000 0.250 0.250 0.250
1.000 0.500 0.500 0.500
0.500 1.000 1.000 1.000
0.200 2.000 2.000 2.000
0.125 4.000 4.000 4.000
0.062 8.000
➀
8.000 8.000
0.031 16.000 16.000 16.000
➀
This is the default setting.
Response Times for dc Inputs 4 and Above (applies to 1761-L10BWA,
1761-L16BWA, -L20BWA-5A, -L32BWA, -L10BWB, -L16BWB,
-L20BWB-5A, -L32BWB, -L16BBB, and -L32BBB controllers)
Nominal Filter
Setting (ms)
Maximum ON
Delay (ms)
Maximum OFF
Delay (ms)
0.50 0.500 0.500
1.00 1.00 1.000
2.00 2.000 2.000
4.00 4.000 4.000
8.00
➀
8.000 8.000
16.00 16.000 16.000
➀
This is the default setting.