topic Re: AGV with different charging and delivery point in FlexSim Forum

AGV with different charging and delivery point

odair_santos_inova — Tue, 12 Nov 2024 12:56:10 GMT

[ FlexSim 24.2.2 ]

Hello, I have a question, if anyone can help me with the solution.

I have an AGV that is loaded with six boxes in processor 1 and then loaded with one box in processor 2. After that, 3 boxes are delivered to Queue 7, then 3 boxes to Queue 6 and finally 1 box in Queue 8. I'm making the model available if anyone can help, I'd appreciate it.

DUAS_ENTREGAS_2_autosave.fsm

Re: AGV with different charging and delivery point

gustavo_teodoroD8NVF — Thu, 14 Nov 2024 14:29:47 GMT

Hello,

Since your processors do not require setup or processing time, I replaced them with a queue for each one, with capacities of 6 and 1, respectively. I also modified the logic to a circular flow, where the AGV picks up 6 boxes at the first station, proceeds to the second, and picks up one more. I used the command Model.find("Queue9").first, which means that the AGV will load the first box. Each subflow generates the required number of tokens per station.

The "wait for events" were necessary to ensure the minimum number of boxes at each station. Then, for unloading, the subflow operates with the required number of tokens per station and with the command token.taskExecuter.first, which means the AGV will unload the first box it is carrying. After the final unloading, it returns to start a new cycle.

The model is attached.

duas-entregas-2_Solution.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Thu, 14 Nov 2024 15:24:50 GMT

Thank you very much, I appreciate your help in resolving the case.

Re: AGV with different charging and delivery point

odair_santos_inova — Thu, 14 Nov 2024 19:50:45 GMT

Good afternoon @Gustavo Teodoro , a question, I created a system with 3 AGV's that load on the same street in three different locations, and unload on the same street in another region in three different locations, apparently the system is working but the AGV2 waits a long time after the last charge to move around. Could you say what could be happening? When you have many AGVs, is there a need to create some rules? since they can download in the same Queue?

Re: AGV with different charging and delivery point

gustavo_teodoroD8NVF — Thu, 14 Nov 2024 20:26:52 GMT

USe acquire resource for each AGVs

Re: AGV with different charging and delivery point

odair_santos_inova — Tue, 19 Nov 2024 12:11:19 GMT

Good morning, I would like to ask for help, I am starting to work with Flexsim. In the model shown, I changed it and I need AGV_A to load 2 pallets with 8 packages into Queue 9, and it must unload the 2 red pallets into Queue6 (red). Furthermore, it must also supply 2 pallets with 4 boxes in Queue10 (blue), however in my model it can only load one pallet and then deposit the 2 pallets in Queue7. The right thing would be for it to supply 2 pallets with 4 colored boxes blue and deposit these 2 blue pallets into queue7. @Gustavo Teodoro Gustavo, Would you have any idea how to solve it?

Modelo_alterado_AAA.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Tue, 19 Nov 2024 12:55:37 GMT

My question is how do I make AGV_A understand that the red boxes produced in Queue 9 must be deposited in Queue 8 and the blue boxes produced in Queue 10 must be distributed one in Queue7 and another in Queue6. If I can get an idea of how to connect the loading and unloading locations. I believe it is using lists. Thanks. @Felix Möhlmann

Modelo_Load_Unload_AGV.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Tue, 19 Nov 2024 16:42:14 GMT

Hello, I'm trying to solve the pallet unloading problem. I made a new model, now I added an AGV_B and it carries yellow and green boxes. Then this AGV_B must unload the Green Boxes in the green Queue or (Queue13), and in the yellow Queue (Queue14) unload the yellow pallets. I used the list for logic. However, the download is not correct, it downloads and continues with the same amount as before and I cannot download the colors according to each color.

Load_Colors.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Tue, 19 Nov 2024 19:26:34 GMT

If anyone can help with this solution I would be grateful. Unloading is wrong, AGV_B cannot unload the yellow pallets into Queue 14 and the green pallets into Queue13. If anyone can help I would be grateful @Gustavo Teodoro

Load_Colors.fsm

Re: AGV with different charging and delivery point

moehlmann_fe — Wed, 20 Nov 2024 07:45:47 GMT

In the load "Run Sub Flow" activities, the "items" label doesn't exist yet. The subflow token will create/add to that label when it pulls a pallet from the list. Each subflow token should only pull one item.

While it's technically possible to differentiate the pallets by the color of the items on them, it's generally advisable to use a label for this. In the "On Creation" trigger of the pallet sources I write the label "Color" to the pallets with a value of "Green" and "Yellow". The queues to which they are unloaded get the same label.

This allows you to run a subflow for each item and decide whether to unload it by checking if the label on the pallet and that on the queue match.

load-colors_1.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Thu, 21 Nov 2024 10:34:44 GMT

Good morning, a question @Felix Möhlmann in the model presented, the AGV_B, after being loaded, remains stationary for a certain amount of time, waiting for the AGV_A to move. I notice that this occurs when I place several AGV_S in the same model. However, in the simulation I need to see queues formed for the AGVs since there is no possibility of overtaking. So how would you do to make the AGV_B follow towards the AGV_A. Or imagine that I put a Delay on AGVA, like I do for AGV. It's right behind AGV_A. Thank you if you can respond.

Re: AGV with different charging and delivery point

moehlmann_fe — Thu, 21 Nov 2024 11:40:23 GMT

An AGV needs to allocated the next control point along its path before it can continue on from its current control point. You can activate visual indicators to show the current allocations and requests to get a better idea of why an AGV might be waiting.

load-colors-2.fsm

You can influence this in multiple ways:

- Each control point has a setting that determines when it is deallocated. By default this happens when the AGV reaches the next point. A second available option is to deallocated the point as soon as the AGVs center passes it. In the AGV properties you can add additional behaviours, for example deallocating the point once the AGV is some distance past it.

- Adding more control points means the AGVs can move closer to the one in front, since the average distance between the points would be smaller.

- Finally, there is also the "Accumulation" behaviour. This is a setting on the paths. When you activate it, AGVs will come to a stop some distance behind the AGV in front (distance can be customized in the AGV network properties) in addition to the control point logic. To only use this, simply increase the number of allowed allocations per control point.
This does not work with two-way paths. And while attached trailers are taken into account, the logic can of course not predict that trailers will be attached to a waiting AGV.

load-colors-2-accum.fsm

Re: AGV with different charging and delivery point

odair_santos_inova — Fri, 22 Nov 2024 11:24:26 GMT

Good morning, in the same example I made a change. The AGV_B arrives to be loaded with boxes at controlpoint4, where it must be loaded with 2 pallets in different Queues, however there is a 60% possibility of being filled in Queue12, 30% Queue15 and 30% Queue16. At first I made a percentage Label, but I believe that a list is necessary for each Queue, since each processor processes different products. Does anyone have any ideas how I can do this? In principle, I could do it if I made a controlpoint for each Queue, which is different from the real model. I appreciate possible suggestions.

A_Modelo.fsm

Re: AGV with different charging and delivery point

moehlmann_fe — Mon, 25 Nov 2024 09:00:15 GMT

You can use list partitions. These essentially split a list into separate sections and you define from which section to pull.

Check the advanced options in the Push to List option in the Send to Port field of the queues and the Assign Labels and Pull from List in the Process Flow. This could in fact be used to only need a single list for all stations in the model.

Combiner5 was set to "Batch" instead of "Pack".

I changed the percentages to they add up to 100. You might need to adjust them to get the ratio correct.

a-modelo_1.fsm

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