CD Step Response VI

Owning Palette: Time Response VIs

Requires: Control Design and Simulation Module

Calculates the output of the system when a step input excites it. This VI assumes the initial states of the system to be zero. Wire data to the State-Space Model input to determine the polymorphic instance to use or manually select the instance.

Details  

Step Response (State-Space)

	States Graph Ref is a reference to the State Trajectory Graph. States Graph Ref configures the x-scale, y-scale, and legend properties. If you want to use the default settings or customize the settings for these properties, do not wire a value to this input.
	Response Graph Ref is a reference to the Step Response graph. Response Graph Ref configures the x-scale, y-scale, and legend properties. If you want to use the default settings or customize the settings for these properties, do not wire a value to this input.
	State-Space Model contains a mathematical representation of and information about the system of which this VI calculates step response.
	Time Range contains information about the initial time, final time, and time step. t0 is the initial time in seconds in the Step Response graph. The default is –1. dt is the constant interval between successive values in the time vector. The default is –1. tf is the final time in seconds up to which this VI calculates the step response. The default is –1.
	Initial Conditions specifies the initial values of the states or outputs. The default is 0.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Response Plots Index specifies the index number of the inputs and outputs of the system. Input # is the index number of the specific input to the system. This VI displays the response to this input on the Step Response graph. The index is zero-based. Output # is the index number of the specific output of the system that this VI displays on the Step Response graph. The index is zero-based.
	State Plots Index specifies the index number of the inputs and outputs of the system. Input # is the index number of the specific input to the system. This VI displays the response to this input on the Step Response graph. The index is zero-based. State # is the index number of the specific state of the system that this VI displays in the Step Response graph. The index is zero-based.
	Step Response Graph displays a graph that shows the forced response of the system when the forcing function is a step. For MIMO systems, this VI determines the step response by applying a step on one input at a time and letting other inputs to the system be zero.
	State Trajectory Graph displays an XY graph that shows the value of each state as a function of time. For MIMO systems, this VI calculates the states for each input at a time, where one input is the impulse and all the other inputs to the system are zero.
	Step Response Data returns information about the step response. To access the Step Response Data, use the CD Get Time Response Data VI. Time is the uniformly-spaced time vector against which this VI plots the step response and the state trajectories. Outputs Data returns data about the time response of the outputs to the inputs. Refer to the Details section for more information about the Outputs Data. States Data returns data about the time response of the states to the inputs. For transfer function and zero-pole-gain models, this array is empty. Refer to the Details section for more information about the States Data.
	error out contains error information. This output provides standard error out functionality.

Step Response (Transfer Function)

	Response Graph Ref is a reference to the Step Response graph. Response Graph Ref configures the x-scale, y-scale, and legend properties. If you want to use the default settings or customize the settings for these properties, do not wire a value to this input.
	Transfer Function Model contains a mathematical representation of and information about the system of which this VI calculates step response.
	Time Range contains information about the initial time, final time, and time step. t0 is the initial time in seconds in the Step Response graph. The default is –1. dt is the constant interval between successive values in the time vector. The default is –1. tf is the final time in seconds up to which this VI calculates the step response. The default is –1.
	Initial Conditions specifies the initial values of the states or outputs. The default is 0.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Response Plots Index specifies the index number of the inputs and outputs of the system. Input # is the index number of the specific input to the system. This VI displays the response to this input on the Step Response graph. The index is zero-based. Output # is the index number of the specific output of the system that this VI displays on the Step Response graph. The index is zero-based.
	Step Response Graph displays a graph that shows the forced response of the system when the forcing function is a step. For MIMO systems, this VI determines the step response by applying a step on one input at a time and letting other inputs to the system be zero.
	Step Response Data returns information about the step response. To access the Step Response Data, use the CD Get Time Response Data VI. Time is the uniformly-spaced time vector against which this VI plots the step response and the state trajectories. Outputs Data returns data about the time response of the outputs to the inputs. Refer to the Details section for more information about the Outputs Data. States Data returns data about the time response of the states to the inputs. For transfer function and zero-pole-gain models, this array is empty. Refer to the Details section for more information about the States Data.
	error out contains error information. This output provides standard error out functionality.

Step Response (Zero-Pole-Gain)

	Response Graph Ref is a reference to the Step Response graph. Response Graph Ref configures the x-scale, y-scale, and legend properties. If you want to use the default settings or customize the settings for these properties, do not wire a value to this input.
	Zero-Pole-Gain Model contains a mathematical representation of and information about the system of which this VI calculates step response.
	Time Range contains information about the initial time, final time, and time step. t0 is the initial time in seconds in the Step Response graph. The default is –1. dt is the constant interval between successive values in the time vector. The default is –1. tf is the final time in seconds up to which this VI calculates the step response. The default is –1.
	Initial Conditions specifies the initial values of the states or outputs. The default is 0.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Response Plots Index specifies the index number of the inputs and outputs of the system. Input # is the index number of the specific input to the system. This VI displays the response to this input on the Step Response graph. The index is zero-based. Output # is the index number of the specific output of the system that this VI displays on the Step Response graph. The index is zero-based.
	Step Response Graph displays a graph that shows the forced response of the system when the forcing function is a step. For MIMO systems, this VI determines the step response by applying a step on one input at a time and letting other inputs to the system be zero.
	Step Response Data returns information about the step response. To access the Step Response Data, use the CD Get Time Response Data VI. Time is the uniformly-spaced time vector against which this VI plots the step response and the state trajectories. Outputs Data returns data about the time response of the outputs to the inputs. Refer to the Details section for more information about the Outputs Data. States Data returns data about the time response of the states to the inputs. For transfer function and zero-pole-gain models, this array is empty. Refer to the Details section for more information about the States Data.
	error out contains error information. This output provides standard error out functionality.

CD Step Response Details

In the state-space version of the CD Step Response VI, the State Trajectory Graph is not available when the model contains transport delays. You can reduce the nonzero delay entries in the transport delay matrix with the CD Distribute Delay VI. However, distributing the transport delay does not accurately reflect the effect of the delay in the states. Therefore, when transport delays are present in state-space models, the CD Step Response VI eliminates the state trajectories.

This VI supports input and output delays. This VI ignores transport delay information. Refer to the LabVIEW Control Design User Manual for more information about delays.