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Detect multiple driving blocks executing at the same time step


Select the diagnostic action to take when the software detects a Merge block with more than one driving block executing at the same time step.

Category: Diagnostics


Default: error


Simulink® software takes no action.


Simulink software displays a warning.


Simulink terminates the simulation and displays an error message only if the execution order of the driving blocks is not explicitly defined.


  • Connecting the inputs of a Merge block to multiple driving blocks that execute at the same time step can lead to inconsistent results for both simulation and generated code. Set Detect multiple driving blocks executing at the same time step to error to avoid such situations.

  • If Underspecified initialization detection is set to Simplified, this parameter is disabled, and Simulink software automatically uses the strictest setting (error) for this diagnostic. Multiple driving blocks executing at the same time step always result in an error.

Command-Line Information

Parameter: MergeDetectMultiDrivingBlocksExec
Value: 'none' | 'warning' | 'error'
Default: 'error'

Recommended Settings

EfficiencyNo impact
Safety precautionerror

See Also

Related Topics