Create a Simulink.SuppressedDiagnostic object, suppression to suppress the parameter precision loss warning from the Constant block, one.

suppression = Simulink.SuppressedDiagnostic('Suppressor_CLI_Demo/one',...
'SimulinkFixedPoint:util:fxpParameterPrecisionLoss');

You can restore the diagnostic using the restore method.

restore(suppression);

Use the Simulink.suppressDiagnostic function to suppress the parameter precision loss and parameter underflow warnings from the Constant block, one.

diags = {'SimulinkFixedPoint:util:fxpParameterPrecisionLoss', 'SimulinkFixedPoint:util:fxpParameterUnderflow'};
Simulink.suppressDiagnostic('Suppressor_CLI_Demo/one',diags);

Use the Simulink.getSuppressedDiagnostics function to get all suppressions associated with the model, returned as an array of Simulink.SuppressedDiagnostic objects.

suppressed_diagnostics = Simulink.getSuppressedDiagnostics('Suppressor_CLI_Demo')

suppressed_diagnostics = 

  1×2 SuppressedDiagnostic array with properties:

    Source
    Id
    LastModifiedBy
    Comments
    LastModified

Restore all diagnostics using the restore method and iterating through the suppressed_diagnostics array.

for iter = 1:numel(suppressed_diagnostics)
    restore(suppressed_diagnostics(iter));
end