Dashboard WorkInProgress and TimeInSystem

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Laurenz Peleman asked Feb 14, '18 Laurenz Peleman commented Feb 14, '18

Dashboard WorkInProgress and TimeInSystem

Goodmorning everyone

I tried to use the WorkInProgress and TimeInSystem dashboards for the first time, and found out they behaved a bit different than expected. I thought these TrackedVariables were updated automatically, any time a flowitem was created or destroyed.

Hence, I expected that, when plotting the WIP as a 'content' value against time, it would be incremented on creating and decremented on destoying an item. However, WIP only goes up (correctly, as items are created), but apparently no correction is made when flowitems are destroyed. Besides, the value of the TrackedVariable TIS is fixed at 0 during the whole simulation, while I expected it to show the total staytime of all actually present flowitems in the system, which should definitely be a positive value.

Since it is my first attempt to use these statistics, do I overlook some (manual) action I have to do to make these TrackedVariables work?

Thanks in advance, kind regards

Laurenz Peleman

dashboards

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Matt Long commented · Feb 14, 2018 at 01:20 PM

Can you share a model that displays this behavior? I can only guess that you're creating flowitems through something other than a Source, Create Object activity in Process Flow or a Create Flowitems pick option. All of these call the applicationcommand("trackdefaultsoncreate", newitem); that cause these tracked variables to autmoatically be recorded.

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Answer 1 · 2018-02-14T13:30:28Z

Laurenz Peleman answered Feb 14, '18 Laurenz Peleman commented Feb 14, '18

I will post it in a private question then.

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Phil BoBo ♦♦ commented · Feb 14, 2018 at 03:31 PM

@Mischa Spelt

This looks like it might be a bug with the FloWorks::ItemToFlow object not correctly handling WIP and TimeInSystem when it destroys objects.

Laurenz,

This model is a FloWorks model. You should contact Talumis for technical support. Talumis can't see private questions on Answers; only FlexSim USA employees can.

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Laurenz Peleman Phil BoBo ♦♦ commented · Feb 14, 2018 at 03:37 PM

Hi @phil.bobo, thanks for the reply. However, even if issues originate from the ItemToFlow objects (I presume that could cause the WIP not to decrement as expected), why is the TIS of the flowitems in the queue not properly monitored? Is this caused by the downstream objects as well?

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Phil BoBo ♦♦ Laurenz Peleman commented · Feb 14, 2018 at 03:38 PM

TIS is recorded when an item is destroyed. An item's TIS is the time it was destroyed minus the time it was created.

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Laurenz Peleman commented · Feb 14, 2018 at 03:56 PM

Okay, thanks for the clarification! Think this problem is easily solved by updating the TrackedVariables explicitly

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