Process Flow error about Exit Zone instance

[xiaocheng_xie]

[ FlexSim 18.2.3 ]

Hi guys, When i run a model using PF tools，some errors like the following appeared. from the message i know it is something about exit zone instance，but i don't know why. Any explainations or advises are appreciated!

exit-zone-error.fsm

[tanner_p · Accepted solution]

Hi @xiaocheng xie,

This exception can happen when there are too many events happening simultaneously. In order to alleviate the problem, you can simply add a Delay activity with time "0" in front of the Exit Zone activities. As I understand it, this gives the token one fraction of a second longer to "breathe" before another token enters and takes its place.

Hope this is helpful! Here's an updated model that runs without problems.

18824-exit-zone-error-1-1.fsm

[xiaocheng_xie]

@Tanner Poulton，

Thank you for your reply! yes,your method works, and I think it is a basic function to deal with simultaneous events.maybe in the furture development plan, you can improve this issue.

[tanner_p]

Thank you for the feedback. There are a handful of instances where creating a "breathe" activity is necessary or helps avoid errors, so we might not be able to address them all, but this is one that we're aware of.

[JordanLJohnson]

This is actually a bug, which has been fixed, and will be released in the next bug fix release. For now, you can use Tanner's workaround.