Trouble with Enable subsystem.

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Ram Ramanthan 2015-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/243530-trouble-with-enable-subsystem

评论： Ram Ramanthan 2015-9-17

Hello Guys, I am implementing a Simulink structure which uses Enable Subsystems. Based on a certain condition either the value of 1 of -1 goes into the Enabled input. When the input is -1, the subsystem is disabled. However, as soon as the input is 1, the Enable is is always set at 1 and it then holds this value and hence the subsystem always computes. I don't want this to happen. I want the Enabled subsystem not to run when the value is -1. How do I do this? Here are some pictures to clarify.

This is the switch I'm using to trigger:

This is the output of the switch:

Here is the output of the Enable:

I don't understand why its always 1.

Any suggestions? Thanks, Prakash

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Answer 1

Titus Edelhofer 2015-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/243530-trouble-with-enable-subsystem#answer_192704

Hi Prakash,

no, the enable system does not compute when the enable signal is not positive. But the outport hold the last computed value. Go into the enable subsystem, open the outport and switch "Output when disabled" from the default "held" to "reset".

Titus