Pull flowitem from list ordered by ascending number

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Simpson S2 asked Feb 27 2022 at 12:31 PM Ryan Clark commented Mar 03 2022 at 6:11 PM

Pull flowitem from list ordered by ascending number

Hi

test_model.fsm

I want to pull flowitems from list ordered by ascending number and then place them from Queue 1 to Queue 2 by Operator.

When flowitem arrive Queue1, it will be assigned a random number as label "Type" and then push to list.

When the amount in Queue 1 reach to certain number, a token is fired to pull flowitems from list ordered by Type number. I am using query "SELECT item ORDER BY Type ASC" but it is not working. Could anyone help me? Thank you so much!

Software Version:

FlexSim 20.1.3

pull from list ordering

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test-model.fsm (61.1 KiB)

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Answer 1 · 2022-02-27T12:40:45Z

Joerg Vogel answered Feb 27 2022 at 12:40 PM Jason Lightfoot commented Feb 27 2022 at 2:19 PM

Please don't be too smart. Just use a given picklist Option and adjust it. You don't need SELECT nor a value. You need only a field name of entry in your list.

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Simpson S2 commented · Feb 27 2022 at 12:48 PM

Hi Joerg,

Thanks for you comment! Do you mean this? But I got another error in "Load" process flow.

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Jason Lightfoot ♦♦ Simpson S2 commented · Feb 27 2022 at 2:19 PM

You are referencing item on the token - but I expect you want the items in the queue.

This is a common mistake when using lists - you push the token to the list when it would have been better to push the item to the list. Then when you pull from the list you've got a reference to the token and not the item. Furthermore the issue is that the token is released from the push and often gets destroyed meaning if you don't take the information off it immediately you will lose it. Think about what will persist in the model and what are transient objects and try to dispose of the transients as soon as possible (they're just tools to trigger stuff).

So in your load you could try changing it to token.pulled.item but it would be better to change your model to push the item to the list and then pull it directly from the list. I would also change the assignment to label your token with 'item' instead of 'pulled'.

Push the item

Pull the item

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