Stateflow logical Issues using after(x,msec) statement

2026 9 22
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更新时间：2026 9 26
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Hello Members,
PFA my model.
The intention of this model to delay the input signal with a configurable timer by the hardcoded delay count. My logic works fine when the input goes from 0 ->1.(able to see the out signal delayed by 2000ms), but on 1 -> 0, I am unable to see the delay between In and Out.
Anybody can point the logical error here? or help me to optimise the model using Stateflow.
Kind regards,
Joseph

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Mohammed Shaheen
Mohammed Shaheen 2026-9-25，6:15

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Hi Joseph,
The key requirement is that while waiting, output y must remember its last accepted. Currently, the chart runs every 1 ms and InitializeOutput is enabled. Therefore:
  1. Stateflow initializes y to 0.
  2. After the delay, ACTION_St assigns y=u.
  3. ACTION_St remains active for 100 ms.
  4. When it exits, no state assigns y.
  5. Stateflow initializes y back to 0.
As a workaround, Please do the following:
  1. Open the DELAY Stateflow chart.
  2. Click the chart background and open Property Inspector.
  3. Disable Initialize outputs every time chart wakes up (InitializeOutput).
  4. Initialize the output explicitly:
INIT_St/
y = 0;
Cur_St = 0;
I hope this helps.
Thanks,
Shaheen.

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