Check usage of Memory and Unit Delay blocks

Check ID: mathworks.jmaab.jc_0623

Guideline: jc_0623: Usage of continuous-time Delay blocks and discrete-time Delay blocks

• MAB v5.0

• JMAAB v5.1

• JMAAB v6.0

Description

Checks Memory and Unit Delay blocks with inappropriate sample time.

This check identifies these conditions:

• Memory blocks with a discrete sample time.

• Delay and Unit Delay blocks with a non-discrete sample time.

This check requires a Simulink^® Check™ and Stateflow^® license.

Check Parameterization

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:

• NA-MAAB — a

• JMAAB — a

Results and Recommended Actions

Condition	Recommended Action
Memory blocks have sample time that is not continuous.	Use Unit Delay block instead of Memory block.
Unit Delay blocks have non-discrete sample time.	Use Memory block instead of Unit Delay block.

Capabilities and Limitations

• 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.