56 Rockwell Automation Publication 5000-UM005B-EN-P - November 2015
Chapter 4 Current/Voltage/Temperature-sensing Analog Input Module Features (5069-IY4)
Noise Rejection When Using Different Notch Filter Selections
When input channels on the same module use different Notch Filter selections,
you must consider the sample time for each channel. This helps you to find the
recommended RPI that provides enough time for sampling all channels.
When input channels on the same module use different Notch Filter selections,
the recommended minimum RPI rates for all enabled channels are added
together.
Table 14 lists the values in an example application that needs a faster
sampling speed.
Table 15 lists the values in an example application that needs better
noise rejection.
Table 14 - Example Application That Requires Faster Sampling Speed
Channel Notch Filter
Recommended Minimum Module
RPI for Each Channel
(1)
(1) The values in this column are listed in Table 13.
Recommended Minimum Module
RPI to Use in Module Configuration
Ch00 50 Hz 25 ms
37.7 ms
Ch01 1000 Hz 2 ms
Ch02 200 Hz 10 ms
Ch03 625000 Hz 0.7 ms
Table 15 - Example Application That Requires Better Noise Rejection
Channel Notch Filter
Recommended Minimum Module
RPI for Each Channel
(1)
(1) The values in this column are listed in Table 13.
Recommended Minimum Module
RPI to Use in Module Configuration
Ch00 50 Hz 70 ms
85.7 ms
Ch01 1000 Hz 5 ms
Ch02 200 Hz 10 ms
Ch03 625000 Hz 0.7 ms
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