Activities being deleted and connections appearing in Process Flow

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Patrick Crowley asked Jul 16, '19 Patrick Crowley edited Jul 17, '19

Activities being deleted and connections appearing in Process Flow

Hello,

I am having what appears to be a strange bug when I run a process flow driven simulation. As the sim runs, activities disappear from process flow and connection appear to nowhere. Most of them have "NULL" as their FROM port.

The only errors that appear are about half an hour sim time after the random connections start appearing. Any help diagnosing what is going on here would be appreciated.

before.png

after.png

time: 2520.050000 exception: Exception caught in Executive::processeventinlist(). Throwing.
time: 2520.050000 exception: Exception caught in Executive::steptotime(). Throwing.
time: 2520.050000 exception: Exception caught in Executive::tick(). Throwing.
time: 2520.050000 exception: int runthemessageloop() #4
exception: Executive::instance.tick();
time: 2520.050000 exception: int runthemessageloop() #6

Software Version:

FlexSim 19.1.1

process flow bug connections activity

before.png (128.9 KiB)

after.png (138.7 KiB)

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Matthew Gillespie ♦♦ commented · Jul 16, 2019 at 03:38 PM

Can you attach the model?

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Patrick Crowley Matthew Gillespie ♦♦ commented · Jul 16, 2019 at 03:54 PM

Updated the post with the model.

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Matthew Gillespie ♦♦ Patrick Crowley commented · Jul 16, 2019 at 04:02 PM

Do you have a version of the model before the connectors appear?

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Answer 1 · 2019-07-16T17:48:44Z

Matthew Gillespie answered Jul 16, '19 Matthew Gillespie edited Jul 16, '19

You have several unload activities that are unloading current.first. In a general flow current.first is the first process flow activity. So you're moving activities out of the process flow and into the model.

This is breaking your process flow and polluting the 3D model. For example you have 6 process flow activities inside C37 Exit Conveyor. You need to search through the process flow and remove all references to current. I'm assuming you copied sections of activities from an instanced flow.

I would also recommend you simplify your process flows by using sub flows / instanced flows to reduce the total number of activities in the model. It looks like you have a lot of repeated activities/logic which complicates the model and makes it very easy to make mistakes or forget to update parts of the model.

currentfirst.png (53.5 KiB)

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