Prioritize a queue as input vs another queue

Question

question

Marcos MNA asked Nov 26, '20 Ben Wilson commented Dec 2, '20

Prioritize a queue as input vs another queue

Hi, I would like to prioritize a port vs another one. In my model (I attach it), I want prioritize "Queue6" vs "Queue3" as inputs in "Processor3".

Prueba 1.fsmI have tried to select Pull strategy -> Pull Item with Maximimum Time in System and it does not work. The perfect system would be looking if there is a item in "Queue6", "Queue6" will be the input port, if there is anyting in "Queue6", "Queue3" will be the input port. If the option "Pull Item with Maximum Time in System", it would be fine too!

Thank you!

Software Version:

FlexSim 20.2.0

flexsim 20.2.0 queue content prioritization prioritize ports

prueba-1.fsm (37.6 KiB)

· 1

Ben Wilson ♦♦ commented · Dec 02, 2020 at 01:32 PM

Hi @Marcos MNA, was jason.lightfoot's or Gokulakrishnan Kandasamy'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.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always unaccept and comment back to reopen your question.

0 ·

Answer 1 · 2020-11-26T21:30:32Z

Jason Lightfoot answered Nov 26, '20 Jason Lightfoot edited Nov 27, '20

Just order the inputs with the hightest priority first - what you're describing is then default behaviour. Use the arrows shown to change the port sequence.

1606426212884.png (4.0 KiB)

· 2

Marcos MNA commented · Nov 26, 2020 at 09:50 PM

Thank you for your answer. I have just tried to solve the problem with the option you gave me and it does not work well either... Could you take a look at my model in order to search any error you can find? Or if you think it could be an error in another place... Thank you!!

0 ·

Jason Lightfoot ♦ Marcos MNA commented · Nov 27, 2020 at 12:42 PM

I don't know what you did wrong since you didn't attach a model.

In the attached model based on your initial model I made these changes:

Removed the sendtoport on Queue3 (there's only one port out so not needed)
Swapped the ports so that the 'rework' queues 5 and 6 feed into port 1 of the processors as I described above (this is what @Gokulakrishnan Kandasamy did too).
Make the pull "Any Port" - which be default will consider ports in the order of the input connections. By the model, these have to be the longest in the system since they've been through more processes - so you don't need to pull by maximum time in the system.

prueba-1_jl.fsm

1 ·

prueba-1-jl.fsm (35.1 KiB)

Answer 2 · 2020-11-27T04:57:00Z

Gokulakrishnan Kandasamy answered Nov 27, '20

@Marcos MNA Look into the model. I think you want to do this. prueba-1_gk.fsm

prueba-1-gk.fsm (36.3 KiB)

· 1

Marcos MNA commented · Nov 27, 2020 at 07:27 AM

Thank you very much! It seems to work correctly! Could you explain me what you added to the model??

Besides, I will add change over times between different items, I would like Processor1 and Processor3 the last item of a type of item has been processed to start processing a different type of item.

The idea is working by batches of 24 items, and after all of them has arrived "Queue3" I do not want "Processor 1" and "Processor2" starting their setup.

In the model I attach now, if a item is sent to the "Queue5" after a change of model, in Processor 1 a changeover time is made, then it processes a new item model and after than a new changeover time is made to go back processing the first kind of item, another changeover and then it continues processing the second type of items.

Thank you!

Prueba 2.fsm

0 ·

prueba-2.fsm (38.5 KiB)

question