Table Of Contents

PID Design (Chien-Hrones-Reswick) (G Dataflow)

Version:
Last Modified: August 28, 2017

Implements autotuning using the Chien-Hrones-Reswick tuning method.

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tuning specifications

Formula to use to convert the model to PID parameters.

Name Value Description
Regulator - 0% 0 Uses the regulator formula for 0% overshoot.
Regulator - 20% 1 Uses the regulator formula for 20% overshoot.
Servo - 0% 2 Uses the servo formula for 0% overshoot.
Servo - 20% 3 Uses the servo formula for 20% overshoot.

Default: Regulator - 0%

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type of controller

Parameters to return as PID gains.

Name Value Description
P 0 Returns only the proportional parameters.
PI 1 Returns the proportional and integral parameters.
PID 2 Returns the proportional, integral, and derivative parameters.
PD 3 Returns the proportional and derivative parameters.

Default: P

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stimulus signal

Stimulus signal for the system.

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response signal

Response signal of the system.

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closed-loop?

A Boolean that specifies whether the system is a closed-loop system.

True The system is a closed-loop system. The node estimates open-loop parameter values based on the closed-loop values the node identifies from the input signals.
False The system is not a closed-loop system.

Default: False

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controller gain

Initial value for the controller gain.

This node uses this input to calculate integral of PID gains.

Default: 0

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dt

Loop-cycle time or interval, in seconds, at which this node is called.

dt must be greater than zero.

Default: 0

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PID gains

Proportional gain, integral gain, derivative gain, and filter coefficient parameters of the controller.

This output can return a cluster or an array of clusters.

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proportional

Proportional gain of the controller.

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integral

Integral gain of the controller.

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derivative

Derivative gain of the controller.

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filter coefficient [a]

Derivative lowpass filter coefficient of the controller.

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stimulus operating point

Stimulus offset for the plant.

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response operating point

Response offset for the plant.

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plant parameters

Gain, time constant, and dead time of the plant.

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Plant Gain (K)

Process gain (K).

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Time Constant (T)

Time constant (T), in seconds.

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Dead Time (L)

Dead time (L), in seconds.

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices

Web Server: Not supported in VIs that run in a web application


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