How i can make my conveyor stop if a queue its empty? Stopping Line concept

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question

Alex Gf asked Mar 25 2017 at 5:31 PM Sam Stubbs commented Mar 31 2017 at 9:45 PM

How i can make my conveyor stop if a queue its empty? Stopping Line concept

I want to stop my main line if i dont have items to transport to the conveyor in a queue of a sub line, I used send message in OnReset at the Queue but it doesn´t works, it just stopped once en then the line didnt stop.

Hope somebody help me!!

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conveyor assembly line stop line

unnamed-1.png (183.9 KiB)

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Sebastian Hemmann commented · Mar 27 2017 at 6:14 AM

@Alex Gf

the Reset Trigger is only fired once you press the reset button. If you want to send your Messages more often, you will have to add some Code in another trigger.

Could you please share your model or create a small example model?

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Alex Gf Sebastian Hemmann commented · Mar 29 2017 at 2:38 PM

Thanks sebastian, here is the model.

stopping-line-model.fsm

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stopping-line-model.fsm (33.7 KiB)

Sam Stubbs ♦ commented · Mar 27 2017 at 4:01 PM

As sebastian pointed out, it's hard to know without the context of a model. But if you want a conveyor to stop, when it's empty you'll want to use a different trigger than OnReset. Again, as Sebastian pointed out, OnReset only fires when you reset the model. If you want the conveyor to stop when a certain queue is empty. You could use the OnExit trigger in the queue, and make sure your logic checks the condition if the content of "current" (the queue) is 0.

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Alex Gf Sam Stubbs ♦ commented · Mar 29 2017 at 2:37 PM

Hi Samm here is the model, Im a little bit confused by the logic i have to use... but the main idea it´s if the queue1 its empty, the conveyor 1 has to stop until the queue 1 get items.

btw, could you help me? I recently add the second task executer with the option by different case, because of that I also made the source release a batch of items with different itemtype... is there other way to do that?

Thanks!!

stopping-line-model.fsm

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stopping-line-model.fsm (33.7 KiB)

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Answer 1 · 2017-03-31T20:26:35Z

Sam Stubbs answered Mar 31 2017 at 8:26 PM Sam Stubbs commented Mar 31 2017 at 9:45 PM

Using some custom triggers on the Queue, and a motor object (that can be stopped with the stopobject command) I think I was able to achieve something along the lines of what you're looking for.

First I created a motor object and connected it to the conveyor. Then I set up a trigger so that whenever an item leaves Queue 1, the queue sends a 0 delay message to itself. When the message arrives it checks to see if the content of the queue is 0, if so, it stops the conveyor motor. Once something enters the queue again, the motor is resumed.

Here's the model:

6021-stopping-line-model-1.fsm

6021-stopping-line-model-1.fsm (34.6 KiB)

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