Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 55
Current/Voltage/Temperature-sensing Analog Input Module Features (5069-IY4) Chapter 4
Relationship between Notch Filter Settings and RPI Setting
There is a relationship between a Notch Filter setting and the RPI rate.
• If you want greater noise suppression at the selected Notch Filter
frequency and improved resolution, you use a slower input sample rate.
For example, if you choose the 60 Hz notch filter setting and need better
noise suppression and resolution, the recommended module minimum
RPI is 60 ms.
• If you want a faster input sample rate at the selected Notch Filter
frequency, the noise suppression and resolution is lesser.
Using the previous example, if you choose the 60 Hz notch filter setting
and need faster input sampling, the recommended module minimum RPI
is 20 ms.
In
Table 13, each Notch Filter setting has two recommended minimum module
RPI values that allow the required time to collect samples from each channel.
One setting provides faster sample speed and the other provides slightly better
resolution at slower sample speeds.
Table 13 - Notch Filter and Recommended Minimum Module RPI Values - Effect on Noise Rejection
Notch Filter
Recommended Minimum Module RPI Value
Application That is Configured With Only One Channel Enabled Application With All Channels Enabled and Using the Same Notch
Filter Setting on All Channels
Faster Sampling Speed Better Noise Rejection Faster Sampling Speed Better Noise Rejection
5 Hz 215 ms 635 ms 750 ms
(1)
N/A
10 Hz 110 ms 320 ms 440 ms N/A
15 Hz 65 ms 195 ms 260 ms N/A
20 Hz 60 ms 165 ms 240 ms 660 ms
50 Hz 25 ms 70 ms 100 ms 280 ms
60 Hz (default) 20 ms 60 ms 80 ms 240 ms
100 Hz 15 ms 35 ms 60 ms 140 ms
200 Hz 10 ms 20 ms 40 ms 80 ms
500 Hz 5 ms 10 ms 20 ms 40 ms
1000 Hz 2 ms 5 ms 8 ms 20 ms
2500 Hz 1.5 ms 2.5 ms 6 ms 10 ms
5000 Hz 1 ms 2 ms 4 ms 8 ms
10000 Hz 0.8 ms 1 ms 3.2 ms 4 ms
15625 Hz 0.8 ms 0.9 ms 3.2 ms 3.5 ms
25000 Hz 0.8 ms 0.8 ms 3.2 ms 3.2 ms
31250 Hz 0.8 ms 0.8 ms 3.2 ms 3.2 ms
62500 Hz N/A 0.7 ms N/A 2.8 ms
(1) If you use the 5 Hz Notch Filter setting with four channels, the input data cannot be refreshed at every RPI, even if the maximum RPI allowed is used. Instead, fresh data is delivered approximately every
other RPI.
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