Dont pull operator unless Resource available

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G C asked Jan 4, '19 tannerp commented Feb 28, '19

Dont pull operator unless Resource available

In process flow, if I have two acquire resources (machine and operator), how do I enforce pulling only if both resources are available?

Right now, I'm using a max wait timer on the 2nd acquire resource set at 0.001 minutes with a decide on "failed" label and loop to release and reacquire the first resource again. Basically I'm releasing the first first resource and retrying to acquire both resourced within 0.001 mins.

This seemed inelegant to me, looking for other solutions.

Software Version:

FlexSim 18.2.2

process flow resource release

· 7

G C commented · Jan 04, 2019 at 06:21 PM

I think I just need the code to pull and release process flow resources if anyone can provide. Then I can just make the custom code to do what I need.

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tannerp commented · Jan 04, 2019 at 07:04 PM

A token in Process Flow won't continue from one "Acquire Resource" activity to the next until it has successfully pulled the desired resource. The only exception would be if you used a "Max Wait Timer" option, in which case the token would continue without having pulled the resource.

I'm assuming that you don't want the token to pull a machine, for example, and then wait for an operator while the machine could be utilized elsewhere. Is that correct?

You might consider using Lists instead of Resources. This way you could use custom code to do listpull and listpush commands. I'm just not sure all the implications of either for your model.

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G C tannerp commented · Jan 07, 2019 at 01:06 PM

Could you provide an example of the custom code?

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tannerp G C commented · Jan 08, 2019 at 10:28 PM

There's a lot of capabilities with this. I would reference the user manual for a description of all the parameters. Here's an example of how you would pull something with custom code:

List("ItemList").pull("WHERE type = 3 ORDER BY age", 3, 2, current, current.station)

To access this in the user manual, look under Help -> Commands -> Deprecated then search for "list" and you'll find the code. Note that there is updated syntax in newer FlexSim editions.

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Jeff Nordgren commented · Jan 04, 2019 at 10:27 PM

@G C

Could you possibly send us your model or a sample model of the problem? That would aid us greatly in being able to give you the best answer.

Thanks.

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G C Jeff Nordgren commented · Jan 07, 2019 at 12:42 PM

example.fsm

Here is a simple example. Flow 2 is delayed waiting for 'Resource 1' which has been acquired by Flow 1.

I assume I need some sort of loop which checks both 'Resource 1' AND 'Resource 2' are available.

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example.fsm (21.2 KiB)

Answer 1 · 2019-01-10T12:37:14Z

Raja Sekaran answered Jan 10, '19 Raja Sekaran edited Jan 11, '19

@G C

I have used wait for event activity that listens to the OnResourceAvailable event. This helps to check the available resource to acquire. I have attached the updated model.

Hope this helps.

Thanks

Updated: acquireresource-support.fsm

acquireresource-support.fsm (27.7 KiB)

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