Double pallet elevator with process flow

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question

Alex OA asked Apr 04 2022 at 8:56 AM Jason Lightfoot edited Apr 21 2022 at 2:47 PM

Double pallet elevator with process flow

Hi,

I am trying to define this elevator as a double pallet elevator. I've been trying to do this with the object process flow but I couldn't make it work. The main idea is that the elevator will only go down once it has two pallets.

Thanks!

doubleelevator.fsm

Software Version:

FlexSim 22.0.1

elevator pallet double

1649062375329.png (140.5 KiB)

doubleelevator.fsm (47.6 KiB)

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Answer 1 · 2022-04-18T12:39:55Z

Jason Lightfoot answered Apr 18 2022 at 12:39 PM Jason Lightfoot edited Apr 21 2022 at 2:47 PM

This becomes really simple if you use lists and push the items when they arrive at the exit transfer and model the elevator's behaviour as a single cycle rather than a process for each item.

Getting the elevator to travel to any transfer seems tricky - I added a user command for getting a transfer's location.

Model attached.

doubleelevator_jl2.fsm

1650285501596.png (25.5 KiB)

doubleelevator-jl2.fsm (48.1 KiB)

· 4

Helen commented · Apr 20 2022 at 6:42 PM

Thank you @Jason Lightfoot, that was helpful. I managed to edit your logic and do it with three pallets. Unfortunately, I was not able to edit my model properly.

In your model, this script provides a 3D array with the x, y and z position of the ExitTransfer position.

However, when I try to replicate this in my model, I get the following error.

I’m not sure what this is for. I’m aware that you use this in the source to determine the pickup and dropoff locations (getEntryExitTransferLocation(current.pickupTransfer)). Was it to check something?

To solve this problem, I’ve set my coordinates (both in source and travel). [Again, I’m not sure where this information is used]

However, it seems that apart from this there is something else that I’m not doing correctly because it doesn’t go over this state.

Can you help me with this? I provide my model.

doubleelevator_jl_ms.fsm

Many thanks!

Myriam

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1650479945287.png (25.8 KiB)

1650479945505.png (20.6 KiB)

1650479945175.png (32.0 KiB)

doubleelevator-jl-ms.fsm (8.8 MiB)

Jason Lightfoot ♦♦ Helen commented · Apr 20 2022 at 7:00 PM

I added the usercommand to your model and made the List in the process flow point to the Global List in the toolbox: "ElevatorItems".

doubleelevator-jl2-ms.fsm

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doubleelevator-jl2-ms.fsm (8.8 MiB)

Helen Jason Lightfoot ♦♦ commented · Apr 21 2022 at 9:43 AM

Oh yes, I see that you created the command using modeling logic > user command. Thank you very much @Jason Lightfoot

Just one more curiosity, pallets come to the elevator in a fast move while they go out smoothly. Why is this so?

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Answer 2 · 2022-04-04T13:22:30Z

Joerg Vogel answered Apr 04 2022 at 1:22 PM Joerg Vogel commented Apr 18 2022 at 7:10 AM

doubleelevator.fsm

load-more-from-conveyor.jpg (74.4 KiB)

doubleelevator.fsm (41.3 KiB)

· 5

Joerg Vogel commented · Apr 05 2022 at 7:09 AM

ATTENTION! This approach has nothing to do with process flow. It just delays a tasksequence task evaluation for a break tasktype to let find for a break for requirement function in a taskexecuter a suitable second item to load. To achieve such a delay I have added a delay task to any received tasksequence if the Taskexecuter is empty or in this case: there aren’t any subnodes attached to him.

A process flow logic must check, if there are two pallets available for loading. You would do it by looking for items on a conveyor or by a photo eye counting items. Then you wait for any identified item and load it onto the elevator. After this you let travel the elevator to your destination and you unload each item on him to an entry transfer by a sub flow structure.

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Alex OA Joerg Vogel commented · Apr 13 2022 at 6:46 AM

Hi @Joerg Vogel,

Yes, I realised because I changed some station times and it is not working. Is there any way that I could do it with a process flow? (In order to avoid failing if there is any other change).

Thanks!

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Joerg Vogel Alex OA commented · Apr 13 2022 at 7:10 AM

Sure, it is. But I adjust an internal created tasksequence. If you use process flow, you can do it, too. you can insert into a tasksequence a delay.

You can replace any internal created tasksequence by a process flow created tasksequence.

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