I'm almost new to Simulink and Stateflow. I am trying to model some simple state machines. But when trying to run the model, it shows errors (on the main Matlab screen).
Warning: Input port 1 of 'sample/If' is not connected.
Warning: Output port 1 of 'sample/If' is not connected.
Parsing failed for machine: "sample"(#90)
1) Is there anything wrong with this?
2) One more question: How can I add a timer on S2? e.g. we can not stay more than 2 minutes on S2. So as soon as we enter S2, a timer starts, and when it reaches 2 minutes, then should transition to S3.
P.S. For some reasons, the stateflow thumbnail on simulink scheme is not showing the updated model; there is no condition and if_outfput variables anymore!
Well, the error message is pretty self-explanatory: you haven't connected the input Condition of your Stateflow chart to anything, hence the error. Connect it to a signal in your Simulink (whatever represents your condition signal). Likewise, you haven't connected the output of the chart to anything either. You say these variables aren't there anymore, but Stateflow doesn't seem to think so. Have you deleted them from the Model Explorer? If not, Stateflow will still think they're part of the chart. See Use the Model Explorer with Stateflow Objects in the documentation for more details.
For the timer, yes it's possible. At the moment, you exit S2 to S3 when input ==1. You can change the transition to be [input == 1] || after(2000,sec) (I think). You may need to enable support for absolute time in the model configuration parameters. See Control Chart Execution Using Temporal Logic in the documentation for more details.
Related
I am trying to model a pump system. The system consists of a controller, two ON/OFF valves, and a swept volume acting as a chamber. The controller is responsible for the state of the valves as well as filling the volume and pumping it.
When connecting all the components together, i started getting errors saying " Failed to instantiate equation between components ", for example between the swept volume and the first valve. I tried to delete the valves from the whole system and connect the piston directly to the source, but i then got an error saying "Failed to instantiate equation .." between the piston displacment and its input.
I couldn't understand where is my problem to be exact. Is it with the model themselves that they cannot be connected together or am i missing something else?
I am not an expert in modelica obviously, but i got the basics of course.
To make things clearer, here's the link to my model:
https://www.dropbox.com/s/g9dr40jame3lk2n/pumpsystem.zip?dl=0
Any help would be appreciated.
OpenModelica complains about obsolete connections. You have many connections in your model between components which don't exist anymore.
For example:
connect(ChamberController.PistonDisplacment, sweptVolume1.flange) annotation(...);
connect(close.on, ChamberController.deflate) annotation(...);
To remove these connections, simply click the link in the Messages Browser, which will bring you directly to the correct position in the code.
I want to continuously read simulink signal data into the command line while the simulation is running. get_param() seems to be blocking so that doesn't quite work when put in an infinite while loop.
I'm now trying to use a UDP send block but I can't seem to receive data. My UDP block sends data to localhost over remote port 25000 and local port 25001.
In matlab I use the following code but it simply times out with no data
u=udp('127.0.0.1', 25001,'LocalPort',25000);
fopen(u)
fread(u)
fclose(u)
delete(u)
What are my options to continuously read out simulink signal data into Matlab CLI?
Control Simulation Using the "set_param()" command like follows:
set_param('sys','SimulationCommand','WriteDataLogs')
For a working example, type "sldemo_varsize_basic" in the matlab command window. Then above command becomes
set_param('sldemo_varsize_basic','SimulationCommand','WriteDataLogs')
If you set the simulation time to sufficiently large and start the simulation, the "simout, simout1", "tout" and "xout" variables are created/updated in the workspace every time you issue the command above.
Unfortunately, I was not able to find a good quality documentation of this feature.
Are you trying to store the value of your model outports DURING simulation? This is not possible because the variables 'simout, simout1", "tout","xout" etc are created only once simulation is OVER.
In order to read/store the value of outports during simulation, you will have to attach an 'Runtime Object' to the outports.
Refer 'Access Block Data During Simulation' in the Simulink documentation or see this link: http://in.mathworks.com/help/simulink/ug/accessing-block-data-during-simulation.html?s_tid=gn_loc_drop
Hope it helps :)
This question has already been answered here using RunTime Objects as I have described above:
https://stackoverflow.com/a/17006419/6580313
I've been having this issue since I started using this Simulink model. No matter what I try, Simulink rebuilds the model every time I run it. I've taken a look at the checksums using the following procedure:
>> [cs1, cs1det] = Simulink.BlockDiagram.getChecksum(<model name>);
>> (Here I hit run on the model without changing anything)
>> [cs2, cs2det] = Simulink.BlockDiagram.getChecksum(<model name>);
>> cs1 == cs2
1
1
1
1
Why would Simulink rebuild the model if the checksums are the same? I did create another model with some simple logic in it and after compiling once I was able to run it multiple times without Simulink recompiling it.
Additionally, when I hit run when in Rapid Accelerator mode I notice that an asterisk pops up next to the model name in the title. Since this means that the model has unsaved changes, could running it cause any changes to be made? I've checked the callback methods and there's nothing being run when the sims starts (in fact there's nothing in any of the callback methods).
Is there some kind of basic compilation / initialization / build that Simulink runs through before it runs every time? I'm trying to run my model in Rapid Accelerator mode without having it recompile since it takes roughly 45 minutes to compile every time.
Have I overlooked some configuration parameter of the model? Is there some global MATLAB/Simulink variable I need to change?
Is it building or is it updating?
Typically, when you hit the Run button, MATLAB has to propagate signals, check your model for errors, initialize variables . . .
It may seem like building, but to actually confirm it is building, check to see of you have yourmodelname.c file in the folder.
Also check File Menu preferences, and go through the functions there and see if something is getting called.
Could you try to set Configuration Parameter -> Code Generation -> Interface -> Code replacement library to None (In case that your demand is not related to GNU library ...) on reference model?
By the way, it is working for me.
I want to retrieve the data from simulink during simulation, and use serial network function to send these data to another program. Because I need to use another program to do some tricks and send command back to simulink, so I have to get data from simulink during runtime so that another program can make the right command.
I've tried using To Workspace block to export the data.
However, I can only got value in the very beginning of the simulation.
And I've also tried using scope and change some properties: check Save Data To Workspace and Uncheck Limite data to Last.
First, I started simulation, and I found the ScopeData didn't appear in the Workspace. Only when I stop simulation, ScopeData would appear in workspace.
And after that, I can use ScopeData.signals.values to get values.
But what I want is: when I start simulation, ScopeData would appear in workspace so that I can send these data to other program.
Does anyone know how to achieve this?
I found this page might be helpful, but I still don't know how to continuously export data during simulation.
Use get_param to read data from just at the current time. Also to send the data back to Simulink with set_param of a gain or another block.
An example of get_param
First load and start the simulation:
load_system('myModel')
set_param('myModel','SimulationCommand','Start');
To read data on any line of your simulink model:
Get a simulink block object (let's try a Clock with the name Clock):
block = 'myModel/Clock';
rto = get_param(block, 'RuntimeObject');
Then get the data on its first (or any) output port (or input) of that block.
time = rto.OutputPort(1).Data;
You could do the reading, in a timer callback.
Also this might be helpful: Command Line Functionality for Simulink
During simulation Simulink stores logged data in an internal buffer and only writes the data to the Workspace when the simulation is paused or stopped.
It sounds as if you really need to write an S-function (which will get signal values on a timestep-by-timestep basis) and communicate with Proteus that way.
Of course Simulink is a non-realtime simulator, so if you are talking about doing anything resembling real-time control then you are most likely taking the wrong approach altogether.
At any time during simulation you can force Simulink to write the simulation output data to the workspace:
set_param(bdroot,'SimulationCommand','WriteDataLogs');
I've found that this command is quite unstable in my Matlab 2010a for Win64. In particular I have to avoid it when simulation is stopped (i.e. first check
get_param(bdroot,'SimulationStatus') ), otherwise Matlab shows an error and asks to be restarted.
I am controlling a pilot plant of boiler through Matlab using modbus RTU (serial communication).
I am running my control program (in editor) for 45 mins through a loop but I am facing two problems :
1] I can't change any variable value while running program which is deadly needed.
2] I am unable to see real time data in workspace while running script.
It updates all variables after finishing execution time. For my application I want data to appear for every iteration.
I couldn't solve them so I switched to simulink but that was even more frustrating.
In simulink I used user defined blocks (embedded Matlab function) to generate modbus address PDU which does not support to in-built matlab functions (like dec2hex).
Will please someone let me know in simulink, serial send/receive support which data format?(ASCII/HEX/DEC)
If you want to see the status of your system after each iteration this can be solved by putting a breakpoint there. If required you can even change the value of variables then.