How do I run a simulink model in real-time in normal mode

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bethel o 2012-3-14

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评论： Jan Houska 2013-11-14

I can't seem to figure out how to run a simulink model in real-time in 'Normal' mode

The Mathworks guides says "In your Real-Time Windows Target model, set values for the Sample Time and Maximum Missed Ticks block parameters to prevent missed ticks."

but how to you find this 'Real-Time Windows Target model' that should contain 'Sample Time' and 'Maximum Missed Ticks'.

My models works well in 'External' but as soon as I change to 'Normal' mode it runs in nun real time.

Is there suppose to be a sync block or other blocks that need to be added in my model

I have spent hours on this please help me anybody?

Thanks Behel

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Answer 1

Titus Edelhofer 2012-3-14

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Hi Behel,

not sure, if I fully understand: Real-Time Windows Target is a compiled Simulink model. The model runs in real-time and Simulink (in External mode) is "only" used to control the real-time application. When you change to "Normal mode", Simulink is again in charge and Simulink always executes simulations as fast as possible (usually therefore faster than real-time ;-)). If you want to run Simulink models in Simulink in "soft" real-time, there are methods to slow down the simulation (typically by using an S-function that compares the system time with the simulation time, and waits in between). Many examples are on the file exchange, see e.g. this one.

Titus

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Answer 2

bethel o 2012-3-14

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编辑：John Kelly 2013-11-13

Thank you Titus for your reply

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Answer 3

Doug Eastman 2012-3-14

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Running in real-time in normal mode is a new feature of Real-Time Windows Target in R2012a. To run in real-time you do need to add the Real-Time Synchronization block. The rtvdp model shows an example of using this block.

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bethel o 2012-3-14

Thanks Doug,

Ok this clears up a lot of things because I was using R2011a. Its crazy how one gets left behind by technology in no time.

I guess I have wasted my time for nothing because I cannot even properly work in the 'External' mode because the 'make' process of the 'build' keeps giving an error regarding the sfunction for my external device. I officially hate computers SMASH SMASH

Jan Houska 2013-11-14

If you update to R2012a or later, you will not need to compile your model to run it in Normal Mode. Hence there will be no compiler error for the S-function and everything should just work.

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