PID Controller: Different behavior for external parameter compared to internal parameter in Simulink

Hi,

I use a PID block in Simulink. To test my PID parameter I use a step impuls.

For the model I need to set the "Output saturation". It is possible to change between internal or external source for

the values.

Crazy: If I use internal parameters an set the value e.g. to 250, everything works fine!

If I use the same value with an constan block and external ports, the simulation does not work (stops at the moment

when the step impuls takes place). If I reduce the step size, I even get different results for both methods .....?

Is this a bug?

Best regards.

Harry