Stuck At Wait For Event

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Rober G asked Aug 11, '23 Rober G commented Aug 11, '23

Stuck At Wait For Event

Good day, I hope you are doing well!

I have been struggling with a persistent problem (I am unfortunately very much a beginner)

The wait for event is linked to the truck arrivals, therefore the tokens await material arrival to satisfy the recipe requirements.

Some tokens get stuck at the wait for event because, at their time of creation, there was insufficient inventory. Is there a way I can re-test them so they become "true"? If this is the problem? They have an entry time at the end of the model run which is even more confusing...

@Natalie White had suggested replacing the wait for event with a decide, but this however did not work for me. I had set it up to send the false tokens to connection 2: to the "assign label" and true to connection 1. Is the "decide" still the way to go, but I implemented it wrong?

Please see my attached model.

Any advice would be greatly appreciated!

Software Version:

FlexSim 23.0.10

process flow wait for event zone

1691762313954.png (8.1 KiB)

currentstatemodel.fsm (64.1 KiB)

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Regan Blackett ♦ commented · Aug 11, 2023 at 03:45 PM

The tokens aren't really getting stuck in the way you probably are thinking. If you put a Delay activity with a time of zero after your Wait for Event, then set a stop time of 14700 (first token from the Bunker Arrival, just for example) and Fast Forward the model to that point.

Now hit step twice and notice that the tokens at the Wait for Event have moved on and will go back to your Enter Zone activity and do your process again. They all eventually end up back at the Wait for Event because they fail the Decide test for "Satisfiable". I'd take another look at how that condition is checked.

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Rober G Regan Blackett ♦ commented · Aug 11, 2023 at 07:11 PM

Thank you I will try and figure it out :) to me the decide looks okay but as you say it's not the case.

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Answer 1 · 2023-08-11T15:44:00Z

Jeanette F answered Aug 11, '23 Rober G commented Aug 11, '23

Hello @Rober G

Its actually not remaining stuck. The token does move but it ends up back at the wait for Trucks activity. If you add in a breathe activity and step through the model you will see this.

In this photo you will see the token at the Breathe activity. This token was on the Wait for Trucks activity, so this just shows that it does move from the wait for event activity.

1691768595314.png (54.6 KiB)

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Rober G commented · Aug 11, 2023 at 07:12 PM

Thank you, I will try and figure it out :)

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