MATLAB: Is it possible to make input or output ports in Simulink to automatically take the name of the signal

port namessignal namessimulink

Is it possible to make input or output ports in Simulink to automatically take the name of the signal?

So for example, I have a signal name of "test_input". Is there a way for Matlab to retrieve the signal name? I guess to set the port name we can just use set_param.

Best Answer

There is a ConnectionCallback function which can be implemented for the port of the blocks. This callback is triggered every time connectivity to the port is changes.

Implement this callback for your input and output ports. Inside the callback, you can write the code to get the signal name to which port is connected using get_param() and set the port name using set_param().

See Port Callback.

Related Solutions

MATLAB: How to obtain the name of the signal and propagated signals associated with a block’s input or output ports

There is no built-in function that can find the names of signals connected at a block's input and output ports.

However the attached GET_SIGNAMES function can be used to find the names of signals associated with a block's input and output ports.

MATLAB: How to check the ‘Signal name must resolve to Simulink signal object’ signal property from command-line

Manipulating parameters of a signal and other Simulink objects can be performed using "get_param" and "set_param" functions. Although parameters of a signal such as the signal name and "Signal name must resolve to Simulink signal object" are changed in the graphical user interface by changing the parameters of a signal line, under the hood these are properties of the outport where the signal originates. So instead of using set_param to operate on the signal line it should be used to operate on the outports where the signal originates.

The 'Signal name must resolve to Simulink signal object' dialog parameter corresponds to the 'MustResolveToSignalObject' parameter of a block's Inport or Outport handle. However, this parameter is read-only for an Inport handle and therefore can only be set via an Outport handle.

In order to set the "MustResolveToSignalObject" parameter the signal must have a name. If it does not then Simulink will produce an error notifying you that this parameter cannot be changed when the name of a signal is empty.

The following steps can be used from the MATLAB command prompt or a MATLAB script to achieve this functionality:

1. Find all inport and outport blocks in the top-level system:

outport_blocks = find_system(gcs,  'SearchDepth', 1, 'BlockType', 'Outport');
inport_blocks = find_system(gcs,  'SearchDepth', 1, 'BlockType', 'Inport');

where gcs is the current model.

2. Ensure that the output signal of all Inport blocks has MustResolveToSignalObject= 'on':

for i=1:length(inport_blocks)
   ph = get_param(inport_blocks{i}, 'PortHandles');
   set_param(ph.Outport, 'MustResolveToSignalObject', 'on') ;
end

3. Since it is not allowed to set the 'MustResolveToSignalObject' parameter of an inport handle, trace the signal to the upstream source block of each Outport block and set its Outport handle to MustResolveToSignalObject='on'. Also, since the source block may have multiple outputs, ensure that the correct signal is set by comparing signal names:

for i=1:length(outport_blocks)
   ph = get_param(outport_blocks{i}, 'PortHandles');
   signal_name = get_param(ph.Inport,'Name');
   block_pc = get_param(outport_blocks{i}, 'PortConnectivity');
   src_ph = get_param(block_pc.SrcBlock, 'PortHandles');
   src_outports = src_ph.Outport;
   for j=1:length(src_outports)
      if strcmpi(get_param(src_outports(j), 'Name'), signal_name)
        set_param(src_outports(j), 'MustResolveToSignalObject', 'on');
      end
   end
end

Best Answer

Related Solutions

MATLAB: How to obtain the name of the signal and propagated signals associated with a block’s input or output ports

MATLAB: How to check the ‘Signal name must resolve to Simulink signal object’ signal property from command-line

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