Check for invalid root input and output port connections

Check ID: mathworks.hism.hisl_0079

This check identifies invalid internal connections to the root-level ports of referenced models.

The invalid connections include:

A root output port block connects directly or indirectly to more than one nonvirtual block port.
A root output port block connects to a ground block.
The output port block connects to some elements of a block output.
An output port block connects more than once to the same element.
The signal that drives the root output port block is a test point.
The driving block has a constant sample time and multiple output ports, and one of the other output ports of the block is a test point.
The root output port 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 output port is returned by value.
A partial signal drives a root output port.
A bus element drives a root output port.
A noninlined S-function reads from a root input port in accelerator mode but not normal mode.

Available with Simulink^® Check™.

Condition	Recommended Action
Noninline S-function reads from root input port.	Insert a Signal Conversion block before the noninline S-function.
Invalid root output port connections.	Insert a Signal Conversion block before the output port.