jc_0644: Type setting

Guideline Publication

Control Algorithm Modeling Guidelines - Using MATLAB^®, Simulink^®, and Stateflow^®

All

The data type shall not be set by using a block or Stateflow data when the data type is set by a data object.

Exceptions

Custom Parameter

Not Applicable

Example — Correct

Type is set on the data object.

Sub ID a:

When the data type is set in a block and it differs from the type setting in the data object, it can be difficult to determine which setting is correct. This can impair readability.
When the type is set in the block, maintainability is affected when the signal line type changes.

When block structures are identical, differences between input/output data type can result in different C source code that is not reusable. For reusable functions, data types of input/output blocks should be specified at the subsystem level.
The Data Type Conversion block is used to explicitly set the data type.
When the data type is fixdt (fixed-point), data type must be set individually because each block can have different data points. In this scenario, it is impossible to use only the data object to set the data type.
A block with a specific type set by default.
For example, Output data type is set to boolean by default. It is generally expected that the result of a logical operation boolean, eliminating the need to adjust inheritance settings. Given that the expected type is preconfigured in blocks set by default in this manner, readability and maintainability are not compromised.