Naming Considerations

hisl_0031: Model file names

ID: Title	hisl_0031: Model file names
Description	For model file names: Use these characters: `a-z`, `A-Z`, `0-9`, and the underscore `(_)`. Use strings that are more than 2 and less than 64 characters. (Not including the dot and file extension). Do not: Start the name with a number. Use underscores at the beginning or end of a string. Use more than one consecutive underscore. Use underscores in file extensions. Use reserved identifiers.
Notes	The MATLAB limit for the number of characters you can use in model file names is 2048.
Rationale	Readability Compiler limitations Model-to-generated code traceability
Model Advisor Checks	Check model file name (Simulink Check)
See Also	MAB guideline ar_0001: Usable characters for file names MAB guideline ar_0002: Usable characters for folder names Reserved Keywords (Embedded Coder)
References	ISO 26262-6, Table 1 (1h) 'Use of naming conventions' DO-331, Section MB.6.3.2.e – ‘Low-level requirements conform to standards’ DO-331, MB.6.3.3.e 'Software architecture conforms to standards’ DCL37-C. Do not declare or define a reserved identifier
Last Changed	R2021b
Examples	Recommended `My_model.slx` Not Recommended `_My__model.slx` `2018_01_11_model.slx` `New.slx`

hisl_0032: Model element names

ID: Title	hisl_0032: Model element names
Description	For these types of model elements: Signal labels Parameters Blocks Named Stateflow^® objects (states, boxes, Simulink^® functions, graphical functions, truth tables) And, these types of architecture model objects: Components Ports Connectors Interfaces Stereotypes Use: These characters: `a-z`, `A-Z`, `0-9`, and the underscore `(_)`. Strings with less than 32 characters or another character limit set by Maximum identifier length (Simulink Coder). Do not: Start the name with a number. Use underscores at the beginning or end of a string. Use more than one consecutive underscore. Use reserved identifiers.
Notes	Reserved names: MATLAB^® keywords Reserved keywords for C, C++, and code generation. For complete list, see Reserved Keywords (Simulink Coder). `int8` , `uint8` `int16`, `uint16` `int32`, `uint32` `int64`, `uint64` `inf`, `Inf` `NaN`, `nan` `eps` `intmin`, `intmax` `realmin`, `realmax` `pi` `infinity` `Nil` The MATLAB limit for the number of characters you can use in model element names is 2048.
Rationale	The code generator might remove or mangle invalid characters when producing an identifier in generated code.
Model Advisor Checks	Check model object names (Simulink Check)
See Also	MAB guidelines: jc_0201: Usable characters for subsystem names jc_0211: Usable characters for Inport blocks and Outport block jc_0231: Usable characters for block names na_0019: Restricted variable names
References	MISRA C:2012, Rule 5.1 MISRA C:2012, Rule 21.2 ISO 26262-6, Table 1 (1h) 'Use of naming conventions' DO-331, Section MB.6.3.2.e – ‘Low-level requirements conform to standards’ DO-331, MB.6.3.3.e 'Software architecture conforms to standards’ DCL37-C. Do not declare or define a reserved identifier
Last Changed	R2023a
Examples	Recommended Block name: `My_Controller` Signal name: `a_b` Not Recommended Block name: `My Controller` Signal name: `12a__b`