Check usage of Merge block

Check ID: mathworks.jmaab.jc_0659

Guideline: jc_0659: Usage restrictions of signal lines input to Merge blocks

Identifies the blocks present in between a conditional subsystem and a merge block.

Merge blocks must have direct connections from conditionally executed subsystems. While using a Merge block take the following into consideration:

No blocks must be present in between the Merge and Conditionally executed subsystem blocks, including a virtual subsystem that does not affect the function of Merge block.
The Merge block can be nested inside any number of subsystems, if the preceding condition is satisfied.

This check requires a Simulink^® Check™ license.

This check does not include sub-checks because the MAB modeling guideline provides only one sub ID.

For reference, the MAB guideline sub ID(s) that are recommended for use by the NA-MAAB and JMAAB modeling standards organizations are:

Condition	Recommended Action
One or more blocks inserted in between a Merge and a Conditional Subsystem block.	Make direct connections from Conditional Subsystem blocks to Merge blocks.

Runs on library models.
Analyzes content of library-linked blocks. By default, the input parameter Follow links is set to on.
Analyzes content in masked subsystems. By default, the input parameter Look under masks is set to graphical.
Allows exclusions of blocks and charts.