Interpretation of Simulink block warning

Hello,

I'm back to Simulink after a few years of absence. However, I ran into following warning during simulation, which I've never seen before. And which I still can't interprete after reading it 5 times:

Minimum '-400' and maximum '400' from 'FOC_Controller/PI Controller/U_d' are mapped to a portion of the wide signal coming from 'Output Port 1' of 'FOC_Controller/PI Controller/DQ Limiter/Switch' and have been ignored during range checking. To enable the range checking for the minimum and maximum values, insert a Signal Conversion block with its 'Output' parameter set to 'Signal copy' in front of 'FOC_Controller/PI Controller/U_d'.

Only the bold sentence is unclear to me.

Thanks in advance and greetings,

Thomas

Answer 1

[Jonas]

You have defined minimum and maximum values of a certain output or signal, and then probably created a vector of it using a Mux block. The diagnostics complains that that min/max range is only defined for part of the vector signal.

That's my guess, because it's otherwise difficult to assess without seeing your model.

Answer 2

[Thomas Becker]

Thanks for your answer, but, however, I still don't get it. I have attached a simple example model to reproduce the warning (R2021a and a copy exported to R2016b).

• create a vector of both inputs 1 and 2 using a mux block
• route the vector signal to a switch block and then to a demux block
• afterwards, range checking is not possible, i.e. with the mentioned warning

However, without the switch block, range checking seems to working fine and without warnings.

I just don't understand whats happening in the background and what's the reason for not being able to check the range...