How to make the item choose the queu with the shortest waiting time?

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question

Maria B6 asked Jul 03 2020 at 6:29 PM Ben Wilson commented Aug 31 2020 at 9:29 PM

How to make the item choose the queu with the shortest waiting time?

My model has a processor connected to 3 queues and each of these queues is connected to another processor. Is it possible to make an item from the first processor to choose the queue with the shortest waiting time?

Software Version:

FlexSim 18.2.3

flexsim 18.2.3 decision

· 6

Gokulakrishnan Kandasamy commented · Jul 06 2020 at 7:13 AM

It is not possible to choose the queue with shortest waiting time at initial stage because waiting time will be calculated once inventory starts to add. Try to use basic process flow decision logic to move item to queue whichever you like. Otherwise, there is so many options in send to the port flow tab. Try to use that

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Maria B6 Gokulakrishnan Kandasamy commented · Jul 06 2020 at 11:44 AM

Thank you for your answer, but I should have submitted an image from this part of the model for a better understanding. The situation is the following:

So, my question applies for the Processor1 when it is sending objects to Queue2, Queue3 or Queue 4. In send to port flow tab from the processor I must introduce some instruction/code to make the shortest waiting time the decision criterion. Is it possible?

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Gokulakrishnan Kandasamy Maria B6 commented · Jul 06 2020 at 12:01 PM

@Maria B6 i can't open your image. Please resend it

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Ben Wilson ♦♦ commented · Aug 31 2020 at 9:29 PM

Hi @maria.b6, was joerg.vogel's or braydn.t's answer helpful? If so, please click the red "Accept" button on one of their answers. Or if you still have questions, add a comment and we'll continue the conversation.

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Answer 1 · 2020-07-06T19:13:37Z

Joerg Vogel answered Jul 06 2020 at 7:13 PM Joerg Vogel commented Jul 27 2020 at 3:01 PM

Hi @Maria B6,

longest queue is not shortest waiting time. In the attached model I add all waiting times of all items of the same queue together. Therefore all Items are pushed to a global list on entry event and pulled on exit of any queue. The shortest time gets evaluated if all queues are filled at least with one item. The source code is in the queue previous to the waiting queues. The code is written to insert more queues.

shortest_wait_time_1.fsm

shortest-waitimg-time.png (44.2 KiB)

shortest-wait-time-1.fsm (22.5 KiB)

· 5

Maria B6 commented · Jul 07 2020 at 11:46 AM

@Jörg Vogel this code really worked for my problem. Thank you! I only have one question about the model you sent: I didn't understand the function of the "on reset" trigger, because the update of waiting time values is done with the codes on the "on entry" and "on exit" tabs of the queues, am I right?

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Joerg Vogel Maria B6 commented · Jul 07 2020 at 12:11 PM

On Reset I collect all names of objects connected to the queue which receives items into an array at a label called "outs". If you want to customize the feature limited for output objects, you can edit the source code in the On Reset trigger. In Line 5 I read this label in my code.

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Joerg Vogel Maria B6 commented · Jul 10 2020 at 12:32 PM

@maria.b6

you wrote me an e-mail, what do you want to know about my code? How can I help?

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Maria B6 Joerg Vogel commented · Jul 27 2020 at 11:56 AM

I see that on the list are all the times that the boxes spent on the waiting line. But how is the sum of these values plotted in a table and still in ascending order? Where is this function described?

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Answer 2 · 2020-07-06T14:04:36Z

Braydn T answered Jul 06 2020 at 2:04 PM

@Maria B6

Does this shortest queue option not work?

Also, we cannot see your image.

shortestqueue.png (84.4 KiB)

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