Assertion

R2026b

Check whether signal is zero

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Assertion block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink / Model Verification
HDL Coder / Model Verification

Description

The Assertion block checks whether any of the elements of the input signal are 0. If all of the elements are nonzero, the assertion is true (1) and the block does nothing. If not, the block halts the simulation and returns an error message by default.

Examples

Temperature Control System Communicating with Messages

Distributed control of room temperatures by processing messages from room thermostats and communicating control commands using messages to different receivers.

• Open Model

Ports

Input

Port_1 — Input signal

scalar | vector | matrix

Input signal to the assertion check.

Data Types: half | single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated

Parameters

Enable assertion — Enable or disable check

on (default) | off

Clearing this parameter disables the block and causes the model to behave as if the block does not exist. To enable or disable all verification blocks, regardless of the setting of this option, go to the Configuration Parameters window, click Diagnostics > Data Validity, expand the Advanced parameters section, and set Model Verification block enabling to Enable all or Disable all.

Programmatic Use

Parameter: enabled

Type: string scalar or character vector

Values: "on" | "off"

Default: "on"

Simulation callback when assertion fails — Expression to evaluate when assertion fails

"" (default) | MATLAB expression

Specify a MATLAB^® expression to evaluate when the assertion fails. Because the expression is evaluated in the MATLAB workspace, define all variables used in the expression in that workspace.

Dependencies

To enable this parameter, select Enable assertion.

Programmatic Use

Parameter: AssertionFailFcn

Type: string scalar or character vector

Default: ''

Stop simulation when assertion fails — Whether to stop simulation when check fails

on (default) | off

Select this parameter to stop the simulation when the check fails. Clear this parameter to display a warning and continue the simulation.

Programmatic Use

Parameter: stopWhenAssertionFail

Type: string scalar or character vector

Values: "on" | "off"

Default: "on"

Sample time (-1 for inherited) — Interval between samples

-1 (default) | scalar | vector

Specify the time interval between samples. To inherit the sample time, set this parameter to -1. For more information, see Specify Sample Time.

Dependencies

This parameter is visible only if you set it to a value other than -1. To learn more, see Blocks for Which Sample Time Is Not Recommended.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

Parameter:	SampleTime
Values:	"-1" (default) | scalar or vector in quotes

Block Characteristics

Data Types	Boolean | double | fixed point | half | integer | single
Direct Feedthrough	no
Multidimensional Signals	yes
Variable-Size Signals	no
Zero-Crossing Detection	no

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"simulink/Model Verification/Assertion"

"hdlsllib/Model Verification/Assertion"

Example: add_block("simulink/Model Verification/Assertion","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

For information about how Simulink^® Coder™ generated code handles Model Verification blocks, see Configure Model for Debugging (Simulink Coder).

Not recommended for production code.

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

Architecture	Description
No HDL	Do not generate HDL code for this block.

HDL Block Properties

PreserveUpstreamLogic

Control the removal of unconnected logic. The default is off, which means unconnected logic is not preserved in HDL code. For more details, see PreserveUpstreamLogic (HDL Coder).

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced before R2006a