122 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 3 Configure the 1444 Dynamic Measurement Module
Update Rate 0.1…20.0 seconds Enter the time, in seconds, between each speed
measurement that is used to calculate the acceleration
(rate of change) value.
Speed measurements are updated at a rate not slower
than once per 40 milliseconds but dependent on module
configuration and the overall module processing
requirements. The delta time between samples that are
used for the rate of change calculation is adjusted to the
nearest interval based on the actual measurement update
rate.
Time Constant 0.1…20.0 seconds Enter a time constant for use in the rate of change
calculation.
The time constant calculation effectively smooths the
measurements as it behaves similarly to a high pass filter.
The smaller the time constant the more responsive the
measurement is to rapid changes (or noise).
Minimum Speed Select the minimum speed for which RPM and RPM
dependent tags are set to zero.
When the machine speed is less than the selected
minimum speed any associated RPM tags, and all tags
that require RPM to perform the measurement, are fixed
at zero (0).
Parameter Values Comments
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