Check Dynamic Gap
Check that gap of possibly varying width occurs in range of signal's amplitudes
Libraries:
Simulink /
Model Verification
HDL Coder /
Model Verification
Description
The Check Dynamic Gap block checks that a signal falls outside a range of
values at each time step and executes an assertion after comparison. The width of the
gap can vary from time step to time step. The u port is the tested
input signal. The inputs min and max specify
the lower and upper bounds of the gap, respectively. If u falls
outside of the gap defined by min and max, the
assertion is true (1) and the block does nothing. If not, the block
halts the simulation and returns an error message by default.
The input signals can be scalars, vectors, or matrices. All three input signals must be the same data type. The block compares the value of u to the bounds differently depending on the signal.
When comparing scalars to vectors or matrices, the block compares the scalar signal to each element of the non-scalar signal.
When comparing vectors or matrix signals to other vectors or matrices, the block compares the input to the bounds element-by-element.
For models with more than one vector or matrix input signal, the vectors or matrices must have the same dimensions.
Examples
This example shows how to check if an input signal falls inside a dynamic upper and lower bound using the Check Dynamic Gap block. In this example, the Check Dynamic Gap block compares the value of a tested input signal from a Sine Wave block at the u port to a Ramp block at the max port and a Step block at the min port.
The Check Dynamic Gap block checks if the value of the signal at the max port is less than the value of the test signal, and if the value of the signal at the min port is greater than the value of the test signal. If it is, the block asserts true (1). Because the Output assertion signal parameter of the Check Dynamic Gap block is selected, the block outputs the assertion value. Run the simulation to observe the model output.
At the start of the simulation, the Check Dynamic Gap block output is 1. The output stays at 1 until the simulation time is 2.47, when the sine wave falls below the value of the Ramp block. The block output stays at 0 until the simulation time reaches 3.14, when the sine wave falls below the value of the Step block. The Step block activates when the simulation time reaches 3.5, placing the sine wave between the bounds. The Check Dynamic Gap block recognizes this change and sets the output to 0.
Ports
Input
Output
Parameters
Block Characteristics
Data Types |
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Direct Feedthrough |
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Multidimensional Signals |
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Variable-Size Signals |
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Zero-Crossing Detection |
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Extended Capabilities
Version History
Introduced before R2006a
