Knob Properties

Graphic instrument to set parameter values

Use the Knob instrument to set real-valued data such as amplitude and frequency when an exact value is not required. When you bind a Knob instrument to a parameter with enum type data values, the enumerated values appear as units on the instrument scale. The enumerated values are visible when you run the instrument panel. For more information, see Add Instrument Panel to Tank Model.

To access a dialog box containing key instrument or layout element properties, select the item. In the top, right corner, click the Tasks button .

To access the complete Properties list for an instrument or layout element, in the instrument panel, select the item. In the Properties list, to access a dialog box for a particular property group, click the group. To the right of the group, click the continuation button .

These properties represent a selection from the available properties. For more properties, see Graphical Properties.


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Open the parameter group list to set the off switch parameters.

To enable the knob to turn off the underlying parameter, set Enabled to True. A dot at the extreme low end of the range shows the status of the parameter.

If True, the switch is initially turned on.

Open a dialog box with these tabs:

Open a dialog box with these tabs:

Open a dialog box to configure the scale display.

To set properties of the automatic display generator, under the Generator tab, click the Auto tab.

If MinorCount is even, space the minor ticks equally around the center tick. If MinorCount is odd, replace the center tick with the middle tick.

If True, the top and bottom ticks are constrained to be major ticks with min/max values defined by Min and Span.

The number of labels is span / (desired increment + 1). This setting does nothing if the required labels do not fit in the space available in the graphic.

To set text formatting properties, click the Text Formatting tab.

Open a text editor and construct text to add to number. By default, the units text appears to the right of the number. If Style is Prefix, the text appears to the left of the number.

Specify range of control scale. The properties Max and AngleMax are calculated from Min, Span, AngleMin, and AngleSpan.

By default, the instrument displays values that increase in the customary directions: Clockwise, left to right, or down to up, depending on the instrument. If value is True, reverse the scale so that the values increase in the opposite directions: Counterclockwise, right to left, or up to down.

Scale type, one of:

  • Linear — Monotonic increasing or decreasing

  • Log10 — Log base 10 increasing or decreasing

  • SplitLinearLog10 — Monotonic increasing or decreasing in one part, log base 10 in the other part


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When True, prevents accidental changes in size or location of the instrument instance.


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Specify the hierarchical name of the signal or parameter that is bound to the instrument.

Specify the type of object to which the instrument is bound. The Signal binding is visible only for display instruments.

Bind an instrument instance to a particular target computer. You can bind different instruments in the same instrument panel to different target computers.

Introduced in R2014a