How to set a sample time in a Discrete Transfer Fcn??

I'm following the training of Simulink fundamentals, and I'm stucked trying to set the sample time on the parameters. Is not showing me that option to set it. I attached an image for you to view. Please I need some help with this is the only task that is left to end the course. Thanks in advance.

[ARKA ROYCHOUDHURY]

Hi I have this same problem even in the offline version. I cannot set the time and I cannot progress in the course. I need urgent help please.

[Fernando]

Hey!! I was looking on several websites for help. And finally got something to help here.

Here is what I've done.

Step 1. Make a mask of the discrete transfer function.

Step 2. Promote sample time to show on your parameters.

Step 3. Save changes and then edit parameters of the discrete time function.

If you need any help ping me a message on [e-mail]

BTW: there´s another issue like this on a lesson later on time. For that I haven´t found any help. And that is the 1% that now I need to get the certificate of completion

[Henrique]

Yes, I had the same problem.

Matlab gives some explanation at "https://nl.mathworks.com/help/simulink/ug/sampletimehiding.html".

The workaround by promoting the parameter worked for me. You can read more about promoting the parameter at "https://nl.mathworks.com/help/simulink/ug/parameter-promotion.html"

[Sairaj K R]

Thanks @Fernando

Answer 1

[Oren Savir]

I also got stuck with this problem.

but here is the solution:

Click the block (discrete transfer function)

Go to Model Explorer

change to default from the dropdown menu

Add SampleTime to objects visible:

Then click at bottom on paremter value and change -1 to Ts.

Exit Model Explorer

Clicking the block now includes the Sample Time option.

[Alexander]

Could @MathWorks Support Team please update the training material?

Simulink fundamentals

Modeling Discrete Dynamic Systems

Modeling Discrete Transfer Functions and State-Space Representations

Task 2

[Zhaolun Ding]

There is a easier way to solve this, go to model data editor, scroll down to find the discrete transfer function, then click on the the third column from the right which is sample time, change it from -1 to Ts

[Cagri Namal]

Thanks, I had to do it a bit different. After changing "column view" to default, I clicked "show details" at the right, and scrolled down to find SampleTime, then double-clicked to make it edtiable and changed it to Ts for discrete transfer funct.

[Paula]

Agree with Zhaolun's approach, esier, open model data editor can edit all sample times for all the blocks.

[KIRTHIVASAN]

It worked as ZD said.

Answer 2

[Subhrajeet]

Step1 : Go to Model Explorer and change the Column view to Default.

Step2: Search SampleTime under the search section and double click on the SampleTime, and then the SampleTime will come under "Display column names" section.

Step3: Then see the buttom of the page, The columns will appear [Name, BlockType, SampleTime].

Step4: Then double click on Discrete Filter -> Sample Time to what ever you want.

(See the attached pdf for the Complete Solution)

Answer 3

[Michael]

Per default the sample time of this block is (-1). This means the sample time is inherited from the signal at the input of the block. It is documented at the end of the help page of "Discrete Transfer Fcn" in the chapter "Version History"

Answer 4

[Hassaan]

@MathWorks Support Team I am having the same issue and stuck on this part. None of the solutions worked for me.

Could @MathWorks Support Team please update the training material?

Simulink fundamentals

Modeling Discrete Dynamic Systems

Modeling Discrete Transfer Functions and State-Space Representations

Task 2

[Paula]

sorry to hear this, please open Model Data Editor Under 'Modeling' Tab. you will see the window above. on the far right, there is a column of sample time. you can edit all sample times for all the blocks here. once you put in Ts_filt for block 'Discrete Filter', then go back to the block again, you will see the updated Sample Time shows up. and click on the 'why' which explains in detail why by default , this sample time was hiddlen. Hope this helps.

Answer 5

[Kitsirin]

Does the following block have the correct parameter settings?

Discrete Filter:

Numerator: num_filt

Denominator: den_filt

InitialStates: 0

SampleTime: Ts_filt

[Paula]

Hello, please see my response above regarding this.