122-28176 Parallax Inc, 122-28176 Datasheet - Page 279
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Chapter 8: Proportional-Integral-Derivative Control · Page 269
Figure 8-10 Derivative Evaluation Using Light
Set 4
With a decrease in time between evaluation sampling, roughly the same curves increased
the output. With closer sampling, the maximum change of the signal is better evaluated.
Note the negative output spike at 60 seconds. When the controller was reset, the value of
the last error was reset to zero. When a reading was performed, it was calculated as a
sudden change in error.
Set 5
With the shorter time and higher rates of error change, the output was significantly
higher.
Note the measured readings: With a current error of 458, and a last error of 390, this
produced a change in error (∆E) of 68. With a change in time (∆t) of 0.5 seconds, this
resulted in an output (∆E/∆t) of 68/0.5 or 136.
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