Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 41
Current/Voltage Analog Input Module Features (5069-IF8) Chapter 3
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.
The eight input channels on the 5069-IF8 module are grouped into two groups.
Channels 00…03 are grouped, and channels 04…07 are grouped. When you
determine the recommended minimum module RPI value, remember:
• The recommended minimum module RPI value when channels use
different Notch Filter selections is determined by group.
The recommended minimum RPI rates for all enabled channels are added
together. If any channel in the other group is enabled, the recommended
minimum RPI rate for each enabled channel is increased by 0.2 ms.
• If the groups have different recommended minimum RPI values, use the
higher RPI value when you configure the module.
Table 7 lists the values in an application that needs a faster sampling rate.
Table 8 lists the values in an application that needs better noise rejection.
Table 7 - Example Application That Requires Faster Sampling Speed
Channel
Group
Channel Notch Filter
Recommended Minimum Module
RPI for Each Channel
(1)
Recommended Minimum Module RPI
Recommended Minimum Module
RPI to Use in Module Configuration
Grouped
together
Ch00 50 Hz 25.2 ms
28.3 ms
80.8 ms
Ch01 1000 Hz 2.2 ms
Ch02 - Disabled N/A N/A
Ch03 62500 Hz 0.9 ms
Grouped
together
Ch04 60 Hz 20.2 ms
80.8 ms
Ch05 60 Hz 20.2 ms
Ch06 60 Hz 20.2 ms
Ch07 60 Hz 20.2 ms
(1) The values in this column represent the corresponding recommended minimum RPI value listed in Table 6 with an additional 0.2 ms added to it because at least one channel is enabled in the other group.
Table 8 - Example Application That Requires Better Noise Rejection
Channel
Group
Channel Notch Filter
Recommended Minimum Module
RPI for Each Channel
(1)
Recommended Minimum Module
Recommended Minimum Module
RPI to Use in Module Configuration
Grouped
together
Ch00 50 Hz 70.2 ms
76.3 ms
240.8 ms
Ch01 1000 Hz 5.2 ms
Ch02 - Disabled N/A N/A
Ch03 62500 Hz 0.9 ms
Grouped
together
Ch04 60 Hz 60.2 ms
240.8 ms
Ch05 60 Hz 60.2 ms
Ch06 60 Hz 60.2 ms
Ch07 60 Hz 60.2 ms
(1) The values in this column represent the corresponding recommended minimum RPI value listed in Table 6 with an additional 0.2 ms added to it because at least one channel is enabled in the other group.
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