Tutorial 3.1 instead of a "wait" I use a "wait for event"

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Jose_manuel A asked Sep 29, '21 Ryan Clark commented Oct 7, '21

Tutorial 3.1 instead of a "wait" I use a "wait for event"

Hi,

What would be the setting for a "wait for event" if in the scenario of the example of the tutorial 3.1 instead of a "wait" I use a "wait for event" using the processor as the object? I tried but the Photoeye gets block and the token is waiting but nothing happens... Can you please advise? My plan is to put 3 processors in parallel, so if one is blocked, the box is sent to the next available (using the Photoeye as the desicion maker based on the processors status), could you help me? Many thanks

https://docs.flexsim.com/en/19.2/Tutorials/AdditionalTools/Tutorial3Emulation/3-1BuildBasicPLCLadderLogic/

Software Version:

FlexSim 21.1.0

conveyors wait for event photo eye multiple processors

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Connor A commented · Oct 05, 2021 at 05:49 PM

Hi @Jose_manuel A, was Ryan Clark's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

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Answer 1 · 2021-09-29T20:05:11Z

Ryan Clark answered Sep 29, '21 Ryan Clark commented Oct 7, '21

Hi @Jose_manuel A,

What I would recommend to you is to use Decide activities in addition to Wait for Event activities. You could use a Decide activity to send the box to the first processor that is not in use, and have a fourth option for the case where none of them are available. For that fourth case, you can send the token to a Wait for Event activity to listen to the group of processors for the "OnProcessFinish" event. Then, the token could be released to go to the processor that triggered the event.

I hope this is helpful! Let us know if you have more questions!

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Jose_manuel A commented · Oct 05, 2021 at 07:57 PM

Thanks for the recommendation. Have you got any example I can use as a guide? Many thanks

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Ryan Clark Jose_manuel A commented · Oct 06, 2021 at 12:11 AM

Hi @Jose_manuel A,

Here is a modification of the tutorial you mentioned that incorporates 3 processors, and has items wait at the Photo Eye until there is a processor available. I implemented the Wait for Event a little differently than I described in my earlier post. Instead of using Decide activities, I used a resource linked to the Processors and had it wait until it acquired one of the processors. Then I just listened to the processors to know when the resource was available again.

I hope this helps! Let me know if you have further questions!

Tutorial-3.1-modification-rc.fsm

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tutorial-31-modification-rc.fsm (54.6 KiB)

Jose_manuel A commented · Oct 07, 2021 at 03:40 PM

Thanks once again Ryan. Not sure where the value "token.processor.ProcessorNum" comes from though (Assign labels).

I tried to replicate what you did on a new model and I get this error:

time: 4.081154 exception: FlexScript exception: Label property ProcessorNum retrieved on /Processor1. Label does not exist. at MODEL:/Tools/ProcessFlow/ProcessFlow/Assign Labels>labels/1/2

Any idea what it could be? Many Thanks

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Ryan Clark Jose_manuel A commented · Oct 07, 2021 at 05:05 PM

Hi @Jose_manuel A,

If you look again at my model, I have some labels saved on the processors, so they're always there. That's where the ProcessorNum label comes from. Those labels are just fixed on those objects, and they persist through resets, so you don't have to worry about resetting them every time.

I hope this helps answer your question! Let me know if you still have questions!

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