How to use external simulation time in simulink?

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Jan Theiss 2021-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/762486-how-to-use-external-simulation-time-in-simulink

评论： Fangjun Jiang 2021-3-16

Hello :)

I have sensors and pumps that are connected to a board which has a tcp connection to simulink. Since round times from simulink to the board and back are too long and flickers a little, the control algorithm is executed on the board. It sends data back to simulink after every execution (20 ms) and a time stamp at which the data was sent. I would like to use this time stamp as simulation time to have the data shown correctly in a scope even if they arrived with different latency or maybe even different order. Is there any way to achieve that?

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Answer 1

Fangjun Jiang 2021-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/762486-how-to-use-external-simulation-time-in-simulink#answer_639061

USE "XY Graph" block. X is the received time, Y is the received data.

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Jan Theiss 2021-3-16

编辑：Jan Theiss 2021-3-16

That solves the problem of displaying it correctly. But what if other blocks should use that as their simulation time to calculate other things? Maybe by using a shorter sim interval and delay the simulation so that it matches the received time?

It is a little hard to me to find the right way between discrete simulation of continous signals...

Fangjun Jiang 2021-3-16

That is the "latency" you have to deal with. You can slow down the simulation on the computer or "wait" for the message coming from TCP/IP. But there is no other way better than reducing this "latency" directly if possible.

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