Pull Strategy with logical AND

Question

question

Julian Sundermeier asked Jun 27, '18 Julian Sundermeier commented Jun 27, '18

Pull Strategy with logical AND

Hi everyone,

In my model, I want to realize a material flow using the pull strategy. There are 3 processors that change a label on the flowitem using the "OnProcessFinish"-trigger.

Example:

The pull strategy for processor 1 ensures that it only pull items whose label "test1" does not have the value 1. After working the item, the "OnProcessFinish" trigger sets the value of the label "test1" to 1 so that the item can no longer be pulled from Processor 1.

I did the same thing with the other processors using the labels "test2" for processor 2 and "test3" for processor 3.

Now there is a problem with my pull strategy, after I shortened the process time of processor 2:

Processor 2 now also pulls items whose label "test1" has the value 0 because a logical AND link is missing, which ensures that only items are pulled, where the label "test1" has the value 1 and the label "test2" has the value 0.

I hope you understand my problem and may have a solution for it.

Remark: For academic reasons, I have to work with version 7.3.6

example-pull-strategy.fsm

Software Version:

FlexSim (other)

Software Version:

FlexSim (other - please specify)

pull strategy logical and

example-pull-strategy.fsm (15.1 KiB)

· 2

tannerp commented · Jun 27, 2018 at 04:02 PM

Here's an example model where I set only one label, "test," and then had each processor change that label value using the OnProcessFinish trigger.
pull-strategy-sample-model.fsm

So, to break this down, when the item enters Queue4 it has a label called "test" with value 1. Processor1 pulls items with "test" label value of 1.

The OnProcessFinish trigger in Processor1 changes the label value to 2.

This allows Processor2 to pull the item, change its value to 3, and send it to Processor3 and so on.

This is probably the simplest way to do this model without having to use Process Flow or embed code.

0 ·

pull-strategy-1.png (23.0 KiB)

pull-strategy-2.png (27.9 KiB)

pull-strategy-sample-model.fsm (15.1 KiB)

Julian Sundermeier tannerp commented · Jun 27, 2018 at 04:50 PM

Unfortunately, this variant does not solve my problem as I need it. But @david.seo has already helped me successfully. Thanks anyway!

1 ·

Answer 1 · 2018-06-27T15:41:44Z

David Seo answered Jun 27, '18 Julian Sundermeier commented Jun 27, '18

@Julian Sundermeier

You can set the pull requirement to 'return (getlabelnum(item,"test1") == 1 && getlabelnum(item,labelname) == value); '

This script can solve your issue.

· 1

Julian Sundermeier commented · Jun 27, 2018 at 04:48 PM

Okay thankfully it was easier then i expected.

Thanks for your quick reply!

0 ·

question