Check Dynamic Range (Simulink Reference)

Check that a signal falls inside a range of amplitudes that varies from time step to time step

Library

Model Verification

Description

The Check Dynamic Range block checks that a test signal falls inside a range of amplitudes at each time step. The width of the range can vary from time step to time step. The input labeled sig is the test signal. The inputs labeled min and max are the lower and upper bounds of the valid range at the current time step. If the verification condition is true, the block does nothing. If not, the block halts the simulation, by default, and displays an error message.

The Check Dynamic Range block and its companion blocks in the Model Verification library are intended to facilitate creation of self-validating models. For example, you can use model verification blocks to test that signals do not exceed specified limits during simulation. When you are satisfied that a model is correct, you can turn error-checking off by disabling the verification blocks. You do not have to physically remove them from the model. If you need to modify a model, you can temporarily turn the verification blocks back on to ensure that your changes do not break the model.

Data Type Support

The Check Dynamic Range block accepts input signals of any dimensions and of any data type supported by Simulink. All three input signals must have the same dimension and data type. If the inputs are nonscalar, the block checks each element of the input test signal to the corresponding elements of the reference signals.

For a discussion on the data types supported by Simulink, refer to Data Types Supported by Simulink in the Using Simulink documentation.

Parameters and Dialog Box

Enable Assertion: Unchecking this option disables the Check Dynamic Range block, that is, causes the model to behave as if the block did not exist. The Model Verification block enabling setting on the Data Integrity diagnostics pane of the Configuration Parameters dialog box allows you to enable or disable all model verification blocks in a model, including Check Dynamic Range blocks, regardless of the setting of this option.
Simulation callback when assertion fails: An M-expression to be evaluated when the assertion fails.
Stop simulation when assertion fails: If checked, this option causes the Assertion block to halt the simulation when the block's input is zero and display an error message in the Simulation Diagnostics viewer. Otherwise, the block displays a warning message in the MATLAB command window and continues the simulation.
Output Assertion Signal: If checked, this option causes the block to output a Boolean signal that is true (1) at each time step if the assertion succeeds and false (0) if the assertion fails. The data type of the output signal is Boolean if you have selected the the Implement logic signals as boolean data option on the Simulation and code generation optimization pane of the Configuration Parameters dialog box. Otherwise the data type of the output signal is double.
Select Icon Type: Type of icon used to display this block in a block diagram: either graphic or text. The graphic option displays a graphical representation of the assertion condition on the icon. The text option displays a mathematical expression that represents the assertion condition. If the icon is too small to display the expression, the text icon displays an exclamation point. To see the expression, enlarge the icon.

Characteristics

Direct Feedthrough
No

Sample Time
Inherited from driving block

Scalar Expansion
No

Dimensionalized
Yes

Zero Crossing
No

Direct Feedthrough	No
Sample Time	Inherited from driving block
Scalar Expansion	No
Dimensionalized	Yes
Zero Crossing	No

Check Dynamic Lower Bound Check Dynamic Upper Bound