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Edit Design Requirements

The Edit Design Requirement dialog box allows you to exactly position constraint segments and to edit other properties of these constraints. The dialog box has two main components:

  • An upper panel to specify the constraint you are editing

  • A lower panel to edit the constraint parameters

The upper panel of the Edit Design Requirement dialog box resembles the image in the following figure.

In the context of the SISO Tool in Control System Toolbox™ software, Design requirement refers to both the particular editor within the SISO Tool that contains the requirement and the particular requirement within that editor. To edit other constraints within the SISO Tool, select another design requirement from the drop-down menu.

Edit Design Requirement Dialog Box Parameters

The particular parameters shown within the lower panel of the Edit Design Requirement dialog box depend on the type of constraint/requirement. In some cases, the lower panel contains a grid with one row for each segment and one column for each constraint parameter. The following table summarizes the various constraint parameters.

Edit Design Requirement Dialog Box Parameters

ParameterFound inDescription
TimeUpper and lower time response bounds on step and impulse response plotsDefines the time range of a segment within a constraint/requirement.
AmplitudeUpper and lower time response bounds on step and impulse response plotsDefines the beginning and ending amplitude of a constraint segment.
Slope (1/s)Upper and lower time response boundsDefines the slope, in 1/s, of a constraint segment. It is an alternative method of specifying the magnitude values. Entering a new Slope value changes any previously defined magnitude values.
Final valueStep response boundsDefines the input level after the step occurs.
Rise timeStep response boundsDefines a constraint segment for a particular rise time.
% RiseStep response boundsThe percentage of the step's range used to describe the rise time.
Settling timeStep response boundsDefines a constraint segment for a particular settling time.
% SettlingStep response boundsThe percentage of the final value that defines the settling region used to describe the settling time.
% OvershootStep response bounds 
% UndershootStep response boundsDefines the constraint segments for a particular percent undershoot.

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