feedback (MathScript RT Module Function)
- Updated2023-03-14
- 2 minute(s) read
feedback (MathScript RT Module Function)
Owning Class: connect
Requires: Control Design and Simulation Module and MathScript RT Module
Syntax
SysClosed = feedback(SysIn_1, SysIn_2)
SysClosed = feedback(SysIn_1, SysIn_2, sign)
Description
Connects two system models together to produce a closed-loop model using negative or positive feedback connections. The models must be either continuous models or discrete models with identical sampling times. Refer to the LabVIEW Control Design User Manual for information about connecting models together in a closed-loop configuration.
Inputs
| Name | Description | ||||
|---|---|---|---|---|---|
| SysIn_1 | Specifies a linear time-invariant (LTI) model in transfer function, zero-pole-gain, or state-space form. | ||||
| SysIn_2 | Specifies a linear time-invariant (LTI) model in transfer function, zero-pole-gain, or state-space form. | ||||
| sign | Specifies whether the feedback connections are negative or positive. sign is an integer scalar that takes the following values:
|
Outputs
| Name | Description |
|---|---|
| SysClosed | Returns a closed-loop LTI model consisting of SysIn_1 and SysIn_2 connected together in a closed-loop configuration. All connections are of the type you specify using the sign input. SysClosed is a model in transfer function, zero-pole-gain, or state-space form. If the input models are not of the same form, the following hierarchy determines the form of the SysClosed model: state-space>zero-pole-gain>transfer function. For example, if the SysIn_1 model is in state-space form and the SysIn_2 model is in zero-pole-gain form, the SysClosed model is in state-space form. |
Details
The following table lists the support characteristics of this function.
| Supported in the LabVIEW Run-Time Engine | Yes |
| Supported on RT targets | Yes |
| Suitable for bounded execution times on RT | Not characterized |
Examples
SysIn_1 = tf([1, 1], [1, -1, 3])
SysIn_2 = zpk([1], [1, -1], 1)
SysClosed = feedback(SysIn_1, SysIn_2, 1)