AGV starts running, even if Queue is empty

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Philipp S asked Jan 16, '21 Ralf Gruber commented Jan 18, '21

AGV starts running, even if Queue is empty

I have two AGVs running through a course with many sources and queues. The sources are programmed to push a item at a defined time to the queue.

When I start the simulation, the first AGV starts driving to the first queue, obviously because there is an item. The second AGV starts even if there is no item at the first queue. I think it starts because there are items left at higher queues.

How can I change this behaviour? I want the AGVs only start, if the first queue is loaded.

Software Version:

FlexSim 18.1.2

flexsim 18.1.2 agv load

0001-autosave.fsm (121.6 KiB)

0001.fsm (121.6 KiB)

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Answer 1 · 2021-01-16T09:46:09Z

Ralf Gruber answered Jan 16, '21 Ralf Gruber commented Jan 18, '21

Philipp,

for the current AGV process flow the assumption is made (but not communicated), that an AGV can carry a single load only. In the "Parked AGV Activation" section, the check to activate another parked AGV only checks the number of parked AGVs vs. the number of items to transport. In your scenario you would need to check the number of items to transport vs. the capacity of AGVs:

The problem here is that you would have to know all items that can be picked up by a single AGV. This is probably not too difficult to do in your scenario with a single loop, but imagine a scenario with multiple nested loops. However, although the activation assumes a single load per AGV, the "Loading" section allows the AGV to load more than one item based upon its capacity:

All the template process flows that come with FlexSim are to be understood as starting point to be expanded based on the users specific needs.

Does that point you into the right direction?

activateparkedagv.png (69.4 KiB)

agvcapacity.png (41.6 KiB)

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Philipp S commented · Jan 17, 2021 at 08:12 AM

I'n not quite sure if this is the right way.

If I say, that an AGV is supposed to carry more than one item from one queue, it's the wrong way. I just want one AGV first be activated when the one specific queue is loaded.

But thanks for your ideas.

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Ralf Gruber ♦ Philipp S commented · Jan 17, 2021 at 10:17 AM

Philipp,

can you describe your whole logic, please? Do you want each AGV to start a round when an item appears in the first queue and after that pick up every item in the following queues? Or also just a single item out of each queue? I do not think you would need the AGV template to accomplish that.

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Philipp S Ralf Gruber ♦ commented · Jan 17, 2021 at 01:29 PM

"Do you want each AGV to start a round when an item appears in the first queue and after that pick up every item in the following queues?

That's totally what I want!

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