Items disappearing when pushing and pulling from list.

Question

question

Kari Payton asked Aug 03 2016 at 3:00 PM Adrian Haws edited Aug 03 2016 at 6:43 PM

Items disappearing when pushing and pulling from list.

First I pull a machine from a list, but when I try to push back to the list the item does not go back onto the list. I start out with 4 machines. Pull one, so now I only have 3 items on the list. Then I push the machine back to the list and the number of items stays at 3. @Adrian Haws

Pull

Push

list2.png

Software Version:

FlexSim 16.1.0

push and pull list

list1.png (42.8 KiB)

list2.png (39.5 KiB)

· 6

Adrian Haws commented · Aug 03 2016 at 3:07 PM

@Kari Payton What it is that you're trying to accomplish by pushing and pulling the machines? Would it be possible to see your model?

0 ·

Kari Payton Adrian Haws commented · Aug 03 2016 at 3:32 PM

@Adrian Haws I can't post it. I created machines and pushed them to a list, like you showed me yesterday. So in my custom process flow I pull that machine, the operator travels to the queue and picks up the 3D object, delays, then returns the object back to the queue. I then try to push the machine back to the list but it disappears.

0 ·

Mischa Spelt commented · Aug 03 2016 at 3:27 PM

Hi @Kari Payton. It's hard to determine without seeing the model, but is it possible that you have a Sink somewhere in the flow that pushes the item onto the list? Because if you pull it from the list elsewhere and the original token falls into a sink, the puller suddenly holds an invalid reference which can sometimes lead to unexpected effects.

E.g. in a flow like below, where the Push To List pushes the token itself, you will see that the "pulled" label has become "NULL" by the time the token on the right hand side reaches the Run Sub Flow activity.

0 ·

clipboard01.png (163.3 KiB)

Kari Payton commented · Aug 03 2016 at 5:22 PM

@Adrian Haws I edited the model you sent yesterday to demonstrate. @Mischa Spelt 1639-global-list-example.fsm

0 ·

1639-global-list-example.fsm (26.8 KiB)

Adrian Haws Kari Payton commented · Aug 03 2016 at 5:33 PM

@Kari Payton

The way I previously understood it is that you were pushing and pulling a 3D object (the box) to and from a list in separate Process Flows. With your example now are you pushing the object or the queue? When you said machine that sounded to me like something such as a processor.

Without still fully understanding what's going on in your model a couple things you might look at is the labels you're using with the "Push to List" and "Pull from List" activities, as well as the type of list.

0 ·

Kari Payton Adrian Haws commented · Aug 03 2016 at 5:46 PM

@Adrian HawsI have 4 objects that I'm calling "machines" that are being created in queue2. Then I pull one of those objects from the list, pick up the object, and want to put the object back on queue2. But when I run the model, as it shows, the list never recognizes that the object was pushed back to the list. Instead of showing 4 entries it only shows 3 entries. I have tried both fixed resource and item lists to no avail.

0 ·

______

Cookie preferences

Your privacy is important to us and so is an optimal experience. To help us customize information and build applications, we collect data about your use of this site.

May we collect and use your data?

Learn more about the Third Party Services we use and our Privacy Statement.

Strictly necessary – required for our site to work and to provide services to you

These cookies allow us to record your preferences or login information, respond to your requests or fulfill items in your shopping cart.

YES

Improve your experience – allows us to show you what is relevant to you

These cookies enable us to provide enhanced functionality and personalization. They may be set by us or by third party providers whose services we use to deliver information and experiences tailored to you. If you do not allow these cookies, some or all of these services may not be available for you.

YES

NO

Customize your advertising – permits us to offer targeted advertising to you

These cookies collect data about you based on your activities and interests in order to show you relevant ads and to track effectiveness. By collecting this data, the ads you see will be more tailored to your interests. If you do not allow these cookies, you will experience less targeted advertising.

YES

NO

Are you sure you want a less customized experience?

We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

May we collect and use your data to tailor your experience?

Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.

Answer 1 · 2016-08-03T15:45:33Z

Adrian Haws answered Aug 03 2016 at 3:45 PM Adrian Haws edited Aug 03 2016 at 6:43 PM

@Kari Payton The reason the object wasn't being pushed back onto the list is because it had the wrong reference. In the "Push to List" within the FixedResource flow you had been pushing "Token: Entering". Rather, you should push "Label: Item" since that's what you assigned the object to when you originally pulled it from the list. Also, make sure to check the box called "Keep On List On Early Release" in the "Push to List" activity.

See updated model.

1667-1639-global-list-example-1.fsm (26.9 KiB)

question