Problem with running simulink block diagram in discrete mode

2012 10 31
1 个回答
1 次查看（30 天）

0 个投票

I tried to run a Simulink block diagram which consists three difference blocks ... but it's not working properly ... I tried to diagnose the problem by monitoring the signal values. I found that the output value for the difference blocks is not used. I don't know what is this and what's the problem ... please help me

10 个评论
显示 8更早的评论 隐藏 8更早的评论

Sachin Ganjare
Sachin Ganjare 2012-10-31
Please elaborate your question. For example: Configuration of the block, error received etc.
Pouya Jamali
Pouya Jamali 2012-10-31
just no error received ... the block diagram run properly but the output is always zero which must be not. the configuration for the difference blocks is as follow: Initial condition for previous input: 0.0 Input processing: inherited
Sachin Ganjare
Sachin Ganjare 2012-10-31
Which matlab version & from which toolbox this block comes from?
Pouya Jamali
Pouya Jamali 2012-10-31
It comes from Simulink main library from discrete branch in MATLAB R2012b.
Pouya Jamali
Pouya Jamali 2012-10-31
no, the solver is variable-step discrete time...
Sachin Ganjare
Sachin Ganjare 2012-10-31
编辑：Sachin Ganjare 2012-10-31
What is output datatype & rounding method? And what is nature of your input data, is it a matrix of fractional values less than one?
Pouya Jamali
Pouya Jamali 2012-10-31
the output data type is Inherit: Inherit via internal rule and also the rounding mode is floor. the input signal is a scalar which is very small maybe in order of 1e-6.
Sachin Ganjare
Sachin Ganjare 2012-10-31
Did you check output after first sample time is executed?
Sachin Ganjare
Sachin Ganjare 2012-10-31
编辑：Sachin Ganjare 2012-10-31
Probabaly you did not check your output in scope correctly, rather take it in workspace & check, you will find non zero value as initial output
Pouya Jamali
Pouya Jamali 2012-10-31
Ow, I think the problem is misunderstood ... I should explain it more efficient! using show port values I've monitored all the signals in my block diagram. all the signals are working properly just before passing through difference block. The output of the difference block is not used all the time during simulation. and I think it cause the final output to be zero which must be not.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Sachin Ganjare
Sachin Ganjare 2012-10-31

0 个投票

Check your output min & max values in block configuration.

类别

在 帮助中心 和 File Exchange 中查找有关 Signal Generation 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by