Engineering System Design

 How to model a timer/countdown in statechart?

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Tung Nguyen's profile image
Tung Nguyen posted Mon November 25, 2024 10:16 PM

Hello guys,

I want to make for example, an attribute named: attTime & when light On, attTime will be counting down by 1 each second, after attTime hit 0, transition to light Off. Like picture below.

I tried to set [attTime = 0] but the simulation seems to end right away.

Thanks in advance.

steve rooks's profile image
steve rooks posted Tue November 26, 2024 01:17 PM  Best Answer

Try ==
= is assignment 

== is equivalence 

Andy Lapping's profile image
Andy Lapping IBM Champion posted Wed November 27, 2024 03:22 AM

Also consider using a condition - 'null' triggered transitions are not generally recommended.

Markus Nordstrand's profile image
Markus Nordstrand posted Wed November 27, 2024 05:51 AM

This is how I did it: