How do I send items to every queue?

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question

joey asked Aug 25 2020 at 6:16 AM Ben Wilson commented Sep 02 2020 at 3:05 PM

How do I send items to every queue?

Hello everyone. I have a model that I want to fix. But i can't fix it So i need help. I have 3 types of item.I want to send items from (Source1) to (Queue) in the manner shown in the picture.

I have set the "Send to port" of Source1 to be. By Expression " which results in queue 4,5 No item entry. How do I get items to be sent to every queue? The condition is that each type of item will not mix.

And would it be possible to use only 3D simulations?

This is the model I am building.joey00.fsm

Thank you for your help in advance.

Software Version:

FlexSim 17.0.13

queue source send to port flexsim 17.0.13

1.png (88.9 KiB)

joey00.fsm (18.6 KiB)

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Mischa Spelt commented · Aug 25 2020 at 8:05 AM

@Dev, I was writing an answer suggesting the use of "Matching Item Labels", but it turns out that doesn't take transports underway into account. (I tried to upload the model, and got "denied", but it was just Joey's model with the Send To Port changed).

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Joerg Vogel Mischa Spelt commented · Aug 25 2020 at 8:22 AM

@mischa.spelt, that is a typical runtime problem. Label data is available after an item has entered its destination. A designer has to implement a strategy to control future events. There are circumstances which can delay items on transport like a crash, a down time or a blocked object. Then a special strategy might consider this and choose a different destination. I don’t think it is a development issue, instead it is an issue of individual design in a model. I would look at the destination queues as resources in a model. And I have to manage those resources.

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joey Mischa Spelt commented · Aug 26 2020 at 3:47 AM

Hi @mischa.spelt I don't understand what you are describing. Please explain more or attach a picture for me to understand. Thank you for answering my question. Thank you very much

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Joerg Vogel Mischa Spelt commented · Aug 27 2020 at 1:53 PM

@mischa.spelt, if you get the error "denied" when you upload some file, then try it instantly again. I got those errors sometimes, too.

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Ben Wilson ♦♦ commented · Sep 02 2020 at 3:05 PM

Hi @joey.s, was joerg.vogel's or leungch'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 · 2020-08-27T13:36:05Z

Joerg Vogel answered Aug 27 2020 at 1:36 PM Joerg Vogel edited Aug 27 2020 at 1:46 PM

picklist option "matching item type" is the base of an adjusted source code in the Send to Port Function of the queue.

You must take also into account the items already in transit to the queues or from them away. The classic option "matching item types" checks the last items' type in a receiving object. But you need to store this type already for the items in transit. Thus you change a label value in the receiving object and you compare the label value of the object instead of the item.

Very important is the variable "nroftransportsin", because this value tells you if a queue is already receiving an item, but it hasn't arrived yet.

My model controls the sending of items in function "Send to Port". But there are some additional triggers involved to empty the queues if the last queue receives an item.

The model is of version 17.0. This means there is still the attribute itemtype available. In later versions this attribute is replaced by a simple label called "Type". Then you must replace the function getitemtype(item) by item.Type

matching_item_type_in_transit.fsm

matching-item-type-in-transit.png (51.8 KiB)

matching-item-type-in-transit.fsm (21.4 KiB)

Answer 2 · 2020-08-25T08:45:45Z

CH L answered Aug 25 2020 at 8:45 AM CH L commented Aug 27 2020 at 5:46 AM

If you really want to send only 3 types of item to 5 output ports and the items would not be mixed, the most easy way is adding 2 more sources. Source 1 ~ 3 create item type 1 ~ 3 respectively and they are connected to different queues.

For example:

Source 1 are connected to queue 1 & 2.

Source 2 are connected to queue 3 & 4

Source 5 is only connected to queue 5.

Select "round robin" for "send to port"

1598344960385.png (97.5 KiB)

1598345019115.png (10.1 KiB)

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joey commented · Aug 26 2020 at 3:44 AM

Hi @leungch I thank you for answering questions. If I add a Source and make a queue connection as instructed. It will define the item position of the queue. Which I want the item to be able to swap the position of the queue. What I want to know is whether I can create these logic within 3D? Thanks.

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CH L joey commented · Aug 27 2020 at 5:46 AM

If source code or process flow is not used, I can only build a model similar to what you want (but not exactly).

1. Add a global table (Output_Port) in which the rows and columns are item type and output port number of source respectively.

2. Add a label (item.Output_Port) to item to define the output port for items according to the values in global table.

3. Change the expression in "send to port" to item.Output_Port.

mod2_joey00.fsm

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1598507067185.png (140.8 KiB)

1598507090552.png (24.7 KiB)

mod2-joey00.fsm (18.0 KiB)

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