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Weird spacing behavior on line after transfer station

Valued Contributor
Valued Contributor

I am seeing two different problems that I think are both related to a transfer station. With both of these problems, I saw no indication of them until after making changes elsewhere in the model that should have no effect.

 

I have attached the model, you will find the issue at the top left corner of the model where there is a transfer station transferring onto a singleproc.

 

The first issue appears around 6 minutes into the simulation when the line begins to backup. When this happens the singleproc begins holding the entities until an entity farther up the line moves off. This creates a gap between the MUs with no identifiable cause.

 

The second issue appears around 45 minutes into the simulation. The transfer station randomly starts not loading every container. I cannot account for a reason for this either.


Thoughts? Thanks.

7 REPLIES 7

Re: Weird spacing behavior on line after transfer station

Valued Contributor
Valued Contributor

Just a note:

 

I just realized that the model that I posted has the exit for the line after the singleproc (PSTOP_3) locked. This will accelerate the first problem that I mentioned, but you will not be able to see the second problem without unlocking the exit and running it again.

Re: Weird spacing behavior on line after transfer station

Phenom
Phenom
I don't think anything is wrong with the transfer station

It seems the PSTOP_3 conveyor isn't accumulating because you switched it off

Re: Weird spacing behavior on line after transfer station

Valued Contributor
Valued Contributor

Sorry as I said the exit was not supposed to be locked. Here is the model again with the exit unlocked and as I described in the original post.

Re: Weird spacing behavior on line after transfer station

Phenom
Phenom
@ shellLoad1 object

1. select controls tab

2. Switch off "Exit control once"

It seems that this setting interferes with the Transfer station exit control

Re: Weird spacing behavior on line after transfer station

Valued Contributor
Valued Contributor

Awesome! Yeah that fixed it. I don't really understand why that causes problems, but I wasn't using it for anything so that is fine. 

Do you have any ideas why the MUs are exiting oddly onto the line? The weird gap that seems to be being created.

Re: Weird spacing behavior on line after transfer station

Phenom
Phenom

when adding a transfer station to an object , automatically an exit control is implemented

This exit control maybe called several times for individual transfer processes.


In you're case it was limited to one call.

It seems that " exit control once" is set by default in singleproc classes and
not switched off when adding a Transfer Station to a singleproc instance,
which led to your problem.

@weird gap

have you switched on "accumulating" for the PSTOP_3 line ?
it was switched off


Re: Weird spacing behavior on line after transfer station

Valued Contributor
Valued Contributor
Ok that makes sense. Thank you very much for explaining that for me.

Also, yep that was the problem. Thank you for that as well!