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

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Version:

Last Modified: January 12, 2018

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

Inputs/Outputs
Compatibility

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%

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

stimulus signal

Stimulus signal for the system.

response signal

Response signal of the system.

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

controller gain

Initial value for the controller gain.

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

Default: 0

dt

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

dt must be greater than zero.

Default: 0

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.

proportional

Proportional gain of the controller.

integral

Integral gain of the controller.

derivative

Derivative gain of the controller.

filter coefficient [a]

Derivative lowpass filter coefficient of the controller.

stimulus operating point

Stimulus offset for the plant.

response operating point

Response offset for the plant.

plant parameters

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

Plant Gain (K)

Process gain (K).

Time Constant (T)

Time constant (T), in seconds.

Dead Time (L)

Dead time (L), in seconds.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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

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