Please see the attached image of simulink block diagram. I am not able to connect the Simulink-PS converter to appropriate PS block. How shall I do it?
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It is stated that I am trying to convert my control scheme which is implemented in the Simulink into TwinCAT. I have used integrator and derivative blocks in my control scheme.
For testing purposes, I am trying to convert a simple Simulink file containing an integrator block. However, I got a build error. How can I resolve this?
Simulink-block-diagram
Error Picture Simulink during building
I'm trying to send and receive data through a serial port using simulink matlab and Arduino. when to receive data from Arduino to simulink matlab no problem!!
but for sent data to Arduino, I'm faced with this error.
and simulation simulink picture is:
The notation double (c) on the output y from your MATLAB Function block indicates that the signal is numerically complex, see Display Signal Attributes in the documentation for more details. This is the source of your problem, as mentioned in the error message (which is pretty self-explanatory by the way).
To fix it, you need to specify the data type of your outputs to be real in the Ports and Data Manager.
Alternatively, you can add a Complex to Real-Imag to the output(s) of your MATLAB Function block and take only the real or imaginary part of the signal, depending on what you want your algorithm to do.
Trying to disable the Zero-Crossing detection for only a given subsystem ( User-defined Matlab Function Block) in my simulink Model, I referred to the Matlab Central Guide, however, for User-defined blocks, this option is not available from the block parameters Menu.
Does any one have an idea?
As you pointed out, MATLAB Function blocks are not part of the blocks that register zero crossings. Your options are either to enable/disable all zero crossings in the configuration parameters or to use a Stateflow chart in continuous-time mode. Alternatively, you can put your MATLAB Function block inside an Enabled/Triggered subsystem.
Can I connect an RC circuit from the Simscape library (as a feedback) to an s-function block and apply a time series as input? I am trying to use the Linearize tool from Control Design to obtain the frequency response of the whole system.
Yes, you can. You need to use the PS-Simulink Converter block to convert the physical signals from your electrical sensor blocks to Simulink signals, and the Simulink-PS Converter block to convert the Simulink signals from your S-function into physical signals to feed into electrical source blocks. Beware of creating algebraic loops though.
Is there a way to create an input/output port in Simulink (some workaround)? The port would be a bus and some signals are set from outside the block while some signals are set by the block. Here is an example:
Given the following bus:
Flow (scalar)
Composition (vector)
Enthalpy (scalar)
I would like Flow to be set from outside the block (there's a pump downstream which sets this value). Composition and Enthalpy are computed by the block.
My solution so far: Make Flow an input into the block and with direct feedthrough set it on the outport. I don't find this solution intuitive because from a graphical point of view the outflow becomes an input into the block (which is true from a math point of view - but I would like to make the Simulink diagram intuitive). I've seen in Modelica the possiblity to create input/output ports (RealPort) and the signal could be read or written by the block. I would need such a feature in Simulink.
It sounds like you need to use Simscape and SimHydraulics, which do excatly what Modelica does, but within Simulink. Each physical domain is represented with through and across variables, which are flow rate and pressure for the hydraulic domain. However, that's extra $$/££/€€ and a new modelling paradigm (you don't think in terms of inputs and outputs anymore)...
If you stay with Simulink blocks, there isn't much else you can do above what you've already done, although I assume you mean the flow is set on the input, not the output.