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Chapter 3 Using the PID Control Toolkit
© National Instruments Corporation 3-11 LabWindows/CVI PID Control Toolkit User Manual
The control loops can be timed in the following ways:
• Software-Timed—In software-timed control loops, the timing is controlled by the
software loop rate. You can implement a software loop with a timer construct, such as a
timer control or asynchronous timer, or a while loop with a delay or sleep operation at
the end.
• Hardware-Timed—In hardware-timed control loops, the timing is controlled by the
DAQ device. The DAQ device is configured with the appropriate sample rate, and the
sample mode is set to hardware-timed.
For more information about DAQ, refer to the NI-DAQmx Help or Traditional NI-DAQ
(Legacy) C Function Reference Help, depending on the DAQ API you are using. Also refer
to the DAQ example programs.
- LabWindows 1
- Important Information 3
- Contents 4
- About This Manual 6
- Overview of the PID Control 7
- Activation Instructions 8
- PID Control 9
- PID Algorithms 10
- Error Calculation 11
- Proportional Action 11
- Trapezoidal Integration 11
- Partial Derivative Action 11
- Controller Output 11
- Gain Scheduling 12
- The Precise PID Algorithm 13
- The Autotuning Algorithm 14
- Tuning Formulas 15
- Chapter 2 PID Algorithms 16
- Using the PID Control Toolkit 18
- Tuning Controllers Manually 19
- Using the PID Library 21
- Control Input Filter 22
- Output Rate Limiting 22
- Using PID with Autotuning 23
- Using PID with Lead-Lag 25
- Using Ramp Generators 26
- Using PID with DAQ Devices 27
- References 29
- Technical Support and 30
- Professional Services 30
- Glossary 32
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