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Patrick Zweekhorst avatar image
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Patrick Zweekhorst asked anthony.johnson commented

How to keep the items on the conveyor?

Hi,

I have a pretty big model in which items move of the conveyor at multiple places (for example):

I removed all module and sensitive stuff from the model in the attachment. The situations is slightly different, but it is still not working correctly. I have "wiggled" almost all conveyors in the model. Deleted the conveyors where it seems to be going wrong, made them bigger/smaller and changed the conveyor types. However it is still going wrong as you can see.

What else can be the problem here and how to solve this?
It is not only this conveyor since it happens on multiple (random?) places.

Any help would be appreciated.

Patrick

Update:

The model also breaks in 20.1.2

ModelTest.fsm

FlexSim 20.0.6
conveyorflowitemtransferflexsim 20.0.6
1590671576370.png (112.0 KiB)
1590671856662.png (232.0 KiB)
modeltest.fsm (103.9 KiB)
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wang W2 avatar image wang W2 commented ·

I also encounter this malfunction sometimes,especially the conveyor is blocked and then resumed, I think it is a bug.

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Patrick Zweekhorst avatar image Patrick Zweekhorst commented ·

@Jordan Johnson, Do you maybe know if someone has some time to check this question? Any tip or work around is very welcome. Thanks

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2 Answers

anthony.johnson avatar image
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anthony.johnson answered anthony.johnson commented

This is a bug. The only way I can figure out how to get around it is to change your entry space on ConveyorLoopBand_Layer2 conveyor type to not add the additional 1.36. The problem is specifically caused when items exit Conveyor38. The entry space causes them to "remain" on the conveyor for longer, such that they are straddling 3+ conveyors at a time, and it's messing up the event calculations.

We'll get this fixed in the next bug fix release.

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Patrick Zweekhorst avatar image Patrick Zweekhorst commented ·

Hi,

Thank you all for your time and responses.
@anthony.johnson, do you maybe have an estimate on when the next bug fix release will come out?

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anthony.johnson avatar image anthony.johnson ♦♦ Patrick Zweekhorst commented ·

@Matthew Gillespie Plan for next bug fix release?

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Jordan Johnson avatar image
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Jordan Johnson answered Phil BoBo commented

I have seen this happen before, especially in auto-build models, or models where the conveyors were built by script. If you can post a model where it happens, then we could maybe try to replicate it and fix it. To work around it, I would try the following:

  • Go to the conveyor upstream of where the item leaves the correct track
  • Click on it, and use the scroll wheel to move the conveyor up. This will break all the transfers to other conveyors.
  • Use the scroll wheel to move the conveyor back down. This will restore it to its original position, and remake the transfers to other conveyors.

You may need to repeat these steps for several of the upstream conveyors. Also, these steps may not resolve your issue. @anthony.johnson or @phil.bobo may have better ideas.

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Steven Hamoen avatar image Steven Hamoen commented ·

@Jordan Johnson Patrick did add a model where the problem is replicated

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Jordan Johnson avatar image Jordan Johnson ♦♦ Steven Hamoen commented ·

Thanks, I only saw the pictures. We'll look into it.

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Phil BoBo avatar image Phil BoBo ♦♦ commented ·

I'm not sure what exactly is causing the problem, but you can work around it by adjusting the Entry Space on the conveyor section that is receiving the items from the Source:

We may need @anthony.johnson to debug what is actually happening and why.

Maybe the workaround above can help debug the issue.

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