PID Gain Schedule VI
Owning Palette: PID VIs
Installed With: PID Control Toolkit
Selects a set of PID gains from a gain schedule for the control of processes that require different sets of gains for different regions of operation, such as highly nonlinear processes. Use the DBL instance of this VI to implement a single control loop. Use the DBL Array instance to implement parallel multi-loop control.
Use the pull-down menu to select an instance of this VI.
PID Gain Schedule (DBL)
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gain scheduling value specifies the current input value to use to select PID gains from the gain schedule. | ||||||||||
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PID gain schedule specifies the gain schedule for the proportional, integral, and derivative gain parameters. Specify the maximum values for the PID gain schedule in ascending order. This VI uses the first set of PID gains in the array for all gain scheduling values less than the corresponding maximum value.If you define a maximum setpoint value and the actual setpoint rises above that value, this VI continues to behave as if the maximum setpoint value were still in effect.
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PID gains out returns the current PID gains from the gain schedule.
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PID Gain Schedule (DBL Array)
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gain scheduling value specifies the current input value to use to select PID gains from the gain schedule. | ||||||||||
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PID gain schedule specifies the gain schedule for the proportional, integral, and derivative gain parameters. Specify the maximum values for the PID gain schedule in ascending order. This VI uses the first set of PID gains in the array for all gain scheduling values less than the corresponding maximum value.If you define a maximum setpoint value and the actual setpoint rises above that value, this VI continues to behave as if the maximum setpoint value were still in effect.
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PID gains out returns the current PID gains from the gain schedule.
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PID Gain Schedule Details
You can use the DBL Array instance of this polymorphic VI in multi-loop PID control applications. In this case, the length of the primary input array determines the length of the output array. Other input arrays do not necessarily need to be the same length as the primary input array. This VI resizes other input arrays to the same length as the primary input array as follows:
- If the input array is longer than the primary input array, the input array is truncated to the length of the primary input array. Additional values in the array are not used.
- If the input array is shorter than the primary input array, the last value of the input array is repeated until the size matches that of the primary input array.
In this manner, an input value that should be used for each output calculation does not need to be specified repeatedly in the array passed into this VI. Instead, the array can consist of a single value that is used for each output calculation.
Example
Refer to the Gain Scheduling Simulator VI in the labview\examples\control\pid\prctrlex.llb for an example of using the PID Gain Schedule VI.