128 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 4 Measurement Definition
The Primary and Alternate signal paths originate from the output of the
Analog-to-Digital Converter (ADC). The ADC samples each channel at
93750 samples/second for all 4 kHz and 20 kHz Module Personalities or
187500 Hz for the 40 kHz personalities
(See General
Page on page 97).
For 20 kHz modes, the output of both ADC channels can be decimated in its
hardware by a factor of 2…36. It is important to apply the divider with as large a
factor as practical for the application. The lower the data rate from the ADC,
the less time the module spends processing the digital samples. This divider
leaves more time available to perform other functions.
Out of the ADC the signal is split into its two paths:
• The Primary Path applies the low and high pass filtering and integration
that is required of the application, and defined in part by the Channel
Measurement Type. See Hardware Configuration Page
on page 111.
The signal processing in this path is defined in two distinct steps (Mid-
Filter, and Post-Filter) where each can serve as the data source for various
measurements. See Table 19
.
• The Alternate Path is available for applications that require more
measurements with another Fmax or synchronously sampled data. Data
from this path is available only at its conclusion.
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