PID block has underspecified signal dimensions, ALL groundblocks affected

Hello!

Im building a simulink model and would like to use the PID block to control the system. However when i run the simulation i recieve the following warning:

" •Block '¨~/PID controllers/PID Controller1/Ground_D' 'Output Port 1' has been set to [1]."

This warning is generated for each and every ground block inside the PID, which is fed with a single error signal formatted as double.

I've tried every suggestion from the software except simply removing the warning, is this a known error or is there something to do about it?

I'm running matlab R2020b (9.9.0.1467703)

and simulink ver 10.2

Thank you in advance!

[Jesse Koenders]

Hi Wilkens,

I have the same thing.. did you find a solution?

Thanks!

Answer 1

[Fangjun Jiang]

I saw this quite often. I think the cause is that the Ground block doesn't have its Dimension (or size) info defined, not even a default value. The warning message says Simulink interprets its size as [1].

For numerical signal, replacing it with a Constant block with zero value usually resolves it. In terms of data value, the Ground block is read as zero.