Conveyor Process Flow for Acquire & Release Area

Question

question

chao.g asked Oct 25 2016 at 1:38 AM Brandon Peterson commented Oct 28 2016 at 5:12 PM

Conveyor Process Flow for Acquire & Release Area

conveyor-process-flow-test.fsmIn the attached model, I am having two small models trying to do the same thing, upper one I am using a station, lower one I am using a decision point.

So when the item arrives at the decision point, there is a 50%, 50% chance to go to either of the two output connections. In the upper one, where I am using stations, it keeps saying Station is an invalid destination to send item, but when I am using decision point and the same logic, it works okay. Not sure why is this happening.

Also, is there a way to use process flow to control the system so that there can't be any part accumulation on the conveyor, just 1 part in each individual station. I can use acquire and release to do that, but when going large scale, process flow is way easier.

Please suggest!

Thanks,

Software Version:

FlexSim 16.2.1

conveyor process flow

conveyor-process-flow-test.fsm (27.2 KiB)

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Answer 1 · 2016-10-25T15:19:25Z

Regan Blackett answered Oct 25 2016 at 3:19 PM Brandon Peterson commented Oct 28 2016 at 5:12 PM

@chao.gao

The short answer is yes, you can definitely use process flow to help out here, a Zone is probably the key element you will need to use. In fact I just answered a similar question here.

I would follow a similar approach for your model by causing an Event Triggered Source to create a token when your source object creates a flowitem, closing the ports of the source, and reopening them when your Tokens enter the zone.

Here's an Example:

conveyor-processflow-control.fsm

PS, I don't know why the Station is an "invalid destination". That feels like a bug.

conveyor-processflow-control.fsm (29.1 KiB)

· 5

chao.g commented · Oct 25 2016 at 6:14 PM

@phil.bobo

Could you take a look at this sample model, for the item traveling from station to station, is that a bug?

Thanks,

Chao

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Phil BoBo ♦♦ chao.g commented · Oct 25 2016 at 6:55 PM

When the station was added, conveyorsenditem() was never updated to make it work with stations. We've fixed it for the next bug fix release so that you can send to stations.

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chao.g Phil BoBo ♦♦ commented · Oct 25 2016 at 6:57 PM

When is the next release date?

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Show more comments

Brandon Peterson ♦ commented · Oct 26 2016 at 1:33 PM

Chao,

Here is an adjusted version of your model that should now be doing what you want it to do.

The reason that you were getting the invalid destination errors was because a station is not a valid destination. In the future a station may become a valid destination but at this time it is not. I simply added a decision point in front of the stations and sent the items there.

I was able to limit the items on the conveyor by using a zone with a max content of 1 for each station.

Let me know if you have any questions.

Good Luck,

Brandon

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conveyor-process-flow-test-v2016-2-0-mv-1.fsm (62.0 KiB)

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