topic Re: InTransit error in FlexSim Forum

InTransit error

santiagodiazames — Mon, 25 Sep 2023 18:03:44 GMT

[ FlexSim 23.2.0 ]

I noticed that in my model, nurses have an InTransit - Available state when they are idle:

In the image above, the selected RN is idle, but her state is InTransit - Available.

Unfortunately when I collect statistics on walking times, this throws off the values significantly.

Is there a way to fix this? I'd like her state to show as it should be, Idle.

Re: InTransit error

jason_lightfoot_adsk — Tue, 26 Sep 2023 10:22:00 GMT

You can change the state in a custom code. With the People module you'll need to check which state_profile is being used.

Re: InTransit error

santiagodiazames — Tue, 26 Sep 2023 14:29:03 GMT

Thanks Jason. I haven't learned how to write custom scripts yet, unfortunately.

If there is no other way, it seems that this issue cannot be solved for now.

Re: InTransit error

Matthew_Gillespie — Tue, 26 Sep 2023 14:44:27 GMT

If you attach the model we can try to figure out what's going wrong.

Re: InTransit error

santiagodiazames — Tue, 26 Sep 2023 15:10:11 GMT

Model SD_39.fsm

Thanks Matthew. I've attached the model.

There are many instances in which RNs show an InTransit state, but in reality they are standing still and idle.
For instance at time 8:33 am, all 6 RNs are standing idle at the "MA Counter 4".
However, they have different states:

RN1 InTransit – Available

RN1_2 Idle – Available

RN1_3 InTransit – Available

RN1_4 Idle – Acquired

RN1_5 Idle – Available

RN1_6 Idle – Available

Re: InTransit error

Matthew_Gillespie — Tue, 26 Sep 2023 18:31:16 GMT

There's an issue with the patient flow. In the Check-out portion you're creating two tokens and starting them in the ExamRoomSetupProcessFlow. However, the 2 sections in that flow are connected so that the Set up room part is being done twice (and the 2nd token is actually starting before it's supposed to because it doesn't have to wait to acquire the RN).

I just removed that 2nd Create Tokens activity and that fixes your issue.

model-sd-39_1.fsm

Re: InTransit error

santiagodiazames — Tue, 26 Sep 2023 18:56:11 GMT

Many thanks Matthew!!
I'll take a look at it now.
But in the meantime, I'll mark this as answered.

Re: InTransit error

santiagodiazames — Tue, 26 Sep 2023 19:36:21 GMT

Hi Matthew,

I noticed that there are now null (empty) values in the PersonMilestones table.
Do you happen to know why that is?

Re: InTransit error

santiagodiazames — Tue, 26 Sep 2023 19:48:24 GMT

It seems that the state issue was indeed fixed.
However, taking a closer look at the model, I noticed that only 68 patients get to see a doctor (81 patients are expected).

The remainder are stuck in the waiting room.

This wasn't happening in the model I attached.
Do you have any idea why this would happen Matthew?
I'll continue reviewing. Any insights are much appreciated!

Re: InTransit error

Matthew_Gillespie — Tue, 26 Sep 2023 20:03:55 GMT

It looks like you're getting deadlock where one patient has the exam table and the PrepExam token has the nurse.

To me, it seems like the ExamRoomSetupProcessFlow should be acquiring the ExamTable earlier so that some other patient doesn't snatch it up before the nurse is ready. Something like this:

model-sd-39_2.fsm

Re: InTransit error

santiagodiazames — Wed, 27 Sep 2023 13:30:18 GMT

Hi Matthew,

I am very grateful for your help.
I checked the statistics generated from this latest model you attached, and it looks accurate now. Excellent!