jc_0171: Clarification of connections between structural subsystems

Guideline Publication

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

• Version 6.0

Sub ID Recommendations

• NA-MAAB — No recommendations

• JMAAB — a, b

MATLAB Versions

All

Rule

Sub ID a

Visual depiction of signal flow shall be clearly shown between subsystems.

Use of Goto and From blocks shall be allowed if:

• At least one signal line is used between connected subsystems.

• Subsystems connected in a feedback loop have at least one signal for each direction.

Exception

Using Goto and From blocks to create buses or connect inputs to Merge blocks.

Custom Parameter

Not Applicable

Example — Correct

Example — Incorrect

Sub ID b

Structural subsystems shall not have pass through signals exclusively for signal routing.

Custom Parameter

Not Applicable

Example — Correct

Example — Incorrect

Signals that are not used in the subsystem are connected to avoid crossing of signal lines.

Rationale

Sub ID a:

• Clarifies structural subsystem connections and execution order.

Sub ID b:

• Eliminating unnecessary connections clarifies the relationship between connections.

• Deviation from the rule can cause to confusion due to unused input/output signals.

Verification

Model Advisor check: Check connections between structural subsystems (Simulink Check)

Last Changed

R2025a