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Steven Hamoen avatar image
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Steven Hamoen asked Jordan Johnson commented

Problem with sending flow item over conveyor system

I'm working on a model where conveyors can be run in 2 directions. I know that the reverse direction is still a bit flunky but I think that this is a very basic approach which should work. I send a product into a conveyor system and out through the same conveyor. But it will not go out even if it does contain the correct destination. We have tried a lot of things but I can't find a solution for it. Is this still a bug in the reverse conveyor system or did we model something wrong?

modelwithbug.fsm

Short description, a large tote is created on a long piece of conveyor. It is moved to the side into a separate system. Here a photoeye changes the direction of a number of conveyors via a user command that sets all target speeds of the conveyors in a group. And a senditem option on a decision point should send the tote back. But it is not doing that.

FlexSim 19.2.0
reversible conveyors
reverseconveyor.gif (4.4 MiB)
modelwithbug.fsm (48.6 KiB)
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1 Answer

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Jordan Johnson answered Jordan Johnson commented

When you connect decision points, FlexSim creates a route from the first to the second using the true direction of the conveyor. This route doesn't change when you reverse conveyors. So essentially, there is no route back tot he beginning.

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Steven Hamoen avatar image Steven Hamoen commented ·

@jordan.johnson

Thanks for explaining!

But what I'm trying is not so strange in conveyor land, so

1. would it be possible to add recalculating routes to the development list?

2. And secondly can you think of a solution for this model? Even if it is hardcore coding?

Thanks

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

1. Certainly! I think it might already be there, but I will make sure that it is.

2. I had some idea about maybe starting with the top conveyors reversed, and then have them flow normally at the photo eye, so you could send the item along normally-flowing conveyors. I don't know if it would work, but it's a thought. Other than that, it seems like geographically close conveyors will have to do. You may need to turn the snap threshold way, way down or something.

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