AGV BreakTo Function doesn't work

Hi,

I'm a new FlexSim user and at the moment I'm trying to implement a BreakTo logic, because I want my taskexecuters to pick up two items if they are from the same queue (if not they should just pick up one item). So I adjust the capacitiy of each taskexecuter to 2 and set the BreakTo function on "same load station".
When there is just one TE at the network, the TE picks up 2 items from the same source if there are two. But with more TEs on the track, they all just pick up one item.
Do you have an idea where's the mistake?

Thank you in advance for your help!

Please post the model so we can see what is happening and explain how to fix it.

Sorry, forgot to do this.
Here's the model.

The problem is that the Dispatcher is passing to First Available.

So before the AGV can even execute its BreakTo to determine which task sequence to do next, the Dispatcher has already passed it to a different AGV that is available.

Attached is your model with some custom code in the Dispatcher's PassTo trigger so that the Dispatcher passes each task to an AGV that has a task to load at that same station. The AGVs then BreakTo Same Load Station with the tasks being queued on themselves (current).

There are other ways to solve this, such as the "LookForWork" picklists that are explained through the AGV tutorials, but this was the simplest way to solve it in your model the way it is built.

If you want more complicated logic for controlling how your AGVs are moving, you could use different AGV Waypoint triggers or even use the ProcessFlow module or Lists in FlexSim 7.7 to completely customize how and when the AGVs receive their task sequences.

Hi Bobo,
Due to loading time of AGV is 30, I think maybe some items will come out during AGV loading.
Since we assumes that the tasksequences are standard sequences, I think change gettotalnroftasks(curTS) == getnroftasks(curTS)" to "getnroftasks(curTS) >= 3 " in Line 15 of PassTo trigger will be better.
:-D
Not sure if it helps.

First, thank you for the custom code. The pick up works as I want it to.
But now there occurs an accumulation of taskexecuters and the simulation stops after about 6.500 time units because the taskexecuter in front is idle.
Has it something to do with the order in which the tasks are dispatched?
And how can I solve this problem?

Thanks in advance!

Hello Johanna,

I am not quite sure, but if your Taskexcuters are not able to overtake at the queue, you get the situation wherein one idle car stays infront of a decision point or unload station and several other cars are blocked. Maybe you let overtake the cars or you have single parking slots for each car.

Jörg

Hi Jörg,
thank you for your reply.
The problem is that an option to overtake other vehicles while they're unloading is excluded because of the guidelines for the model. Is it possible to dispatch new tasks always to the "leading vehicle"?

Johana

Depending on how the actual system that you are trying to simulate works, you may want to customize the PassTo logic so that it gives preference to sending to idle "leading vehicles," or you might want to work through the AGV tutorials to learn how you can keep AGVs moving around looking for more work to do to avoid this type of situation.