Check usage of tunable parameters in blocks

Check ID: mathworks.maab.db_0110

Guideline: db_0110: Block parameters

• MAB v5.0

• JMAAB v5.1

• JMAAB v6.0

Description

Check whether tunable parameters specify expressions, data type conversions, or indexing operations.

To make a parameter tunable, you must enter the basic block without the use of MATLAB^® calculations or scripting. For example, omit:

• Expressions

• Data type conversions

• Selections of rows or columns

Supported blocks include:

• Backlash

• Bias

• Combinatorial Logic

• Constant

• Dead Zone

• Derivative

• Discrete-Time Integrator

• Gain

• Hit Crossing

• Initial Condition (IC)

• Integrator

• n-D Lookup Table

• Magnitude-Angle to Complex

• Memory

• Permute Dimensions

• Quantizer

• Rate Limiter

• Rate Transition

• Real-Imag to Complex

• Relay

• Saturation

• Sine

• State-Space

• Switch

• Transport Delay

• Unit Delay

• Variable Transport Delay

• 1-D Lookup Table

• 2-D Lookup Table

Available with Simulink^® Check™.

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
Blocks have a tunable parameter that specifies an expression, data type conversion, or indexing operation.	In each case, move the calculation outside of the block, for example, by performing the calculation with a series of Simulink blocks, or pre-compute the value as a new variable.

Capabilities and Limitations

• Does not flag block parameters consisting of expressions with literals.

• Runs on library models.

• Analyzes content of library-linked blocks. By default, the input parameter Follow links is set to on.

• Analyzes content in all masked subsystems. By default, the input parameter Look under masks is set to all.

• Does not evaluate mask parameters.

• Allows exclusions of blocks and charts.