Check for invalid root input and output port connections

mathworks.hism.hisl_0079

Since R2024a

Dependencies: Simulink® Check™

Usage: High-Integrity System Modeling

Guideline: hisl_0079: Connections to root input/output ports

Description

This check identifies invalid internal connections to the root ports in referenced models.

Invalid connections include:

  • A root outport block connects directly or indirectly to more than one nonvirtual block port.

  • A root outport block connects to a ground block.

  • The outport block connects to some elements of a block output.

  • An outport block connects more than once to the same element.

  • The signal that drives the root outport block is a test point.

  • The driving block has a constant sample time and multiple output ports, and one of the other outports of the block is a test point.

  • The root outport is conditionally computed and a function prototype control or an encapsulated C++ target is used. The function prototype specification or C++ target specification states that the output variable corresponding to that root outport is returned by value.

  • A partial signal drives a root outport.

  • A bus element drives a root outport.

  • A noninlined S-function reads from a root inport in accelerator mode but not normal mode.

Recommended Actions and Results

Review the violations that are flagged by the check and the recommended action for fixing the issue. After applying the changes, save the model and rerun the check analysis.

Modeling ConditionRecommended Action
Noninline S-function reads from root inport.Insert a Signal Conversion block before the noninlined S-function.
Model includes invalid root outport connections.Insert a Signal Conversion block before the outport.

Capabilities and Limitations

  • Does not allow exclusions of blocks or charts

  • Does not run on libraries

  • Does not analyze content of library-linked blocks

  • Does not analyze the content in masked subsystems

  • Analyzes only active variant choices

  • Performs model compilation

Version History

Introduced in R2024a

See Also

Topics