Get signal name at inport of subsystem

Hi,

I would like a subsystem to know the name of its input so that it can be used for a custom logging solution. I expect a callback on the subsystem which defines a variable could be one way to realize it. I just can't figure out how the callback should obtain the name.

Here is an illustration from the top level:

And how I would get the value from the callback.

Do you have any ideas how the callback would look?

Answer 1

[Fangjun Jiang]

The first case truely has the signal name. You can get it like below. In second case, you need to get the name of the Constant.

ph=get_param(SysBlockPath,'PortHandles');
sp=ph.Inport(1);
SignalName=get(sp,'Name');

[Ralf]

I've got the same question.

The answer works fine as long as there is no Goto/From block connection interrupting the signal line.

Do you have any idea how to handle such a combination? In that case the proposed solution returns an empty char array.

Thank you very much,

Ralf

[Fangjun Jiang]

Turn on the "Show propagated signals" after the From block. If the source of the signal is labeled, you will be able to get the signal label. Note that you could label the signal line differently after the From block.

[Ralf]

Hi Fangjun,

Thank you for your suggestion. But in my case it did not work out. I tried it in R2017b and R2019b. Same result.

Ralf

[Fangjun Jiang]

You are right. This could be a workaround for both cases, assuming the lines are connected and labeled.

LineHandles=get_param(SysBlockPath,'LineHandles');
hLine=LineHandles.Inport(1)
SrcPortHandle=get(hLine,'SrcPortHandle');
if isequal('on',get(SrcPortHandle,'SignalPropagation'))
    signal=get(SrcPortHandle,'PropagatedSignals')
else
    signal=get(SrcPortHandle,'Name')
end

[Ralf]

That is great!

Thank you very much. It solves my problem!

Ralf