Code: How to create a flow item using conditional script on source?

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Perla Jazmín HR asked Nov 19, '19 tannerp commented Dec 13, '19

Code: How to create a flow item using conditional script on source?

I am trying to code the inter-arrival time of a source to create a flowitem based on a conditional.

The source checks if a rack is empty and if a processor has sent an object to th next activity, then I want to create the flowitem.

This is what I have written so far:

if current.centerObjects[1].stats.state().value < 1 and current.inObjects[1].stats.output.value==1;

I'm not the best using code so any suggestion is more than welcome!

Software Version:

FlexSim 19.1.0

source flowitems code snippet

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Answer 1 · 2019-11-20T00:33:13Z

tannerp answered Nov 20, '19 tannerp edited Nov 20, '19

Hi @Perla Jazmín HR,

How often does the source check? If the source checks every time an item leaves the rack or the processor, you can listen to one of those events with a Wait for Event activity in Process Flow. Then, once the token is made, you can check the other condition and if it is also true, send the token to a Create Object activity.

If you're using an inter-arrival time to create the tokens, you would just add two Decide activities to verify both conditions are true.

Hopefully this helps. Let us know what feedback you have.

create-flow-item.png (18.7 KiB)

double-decide.png (18.6 KiB)

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Answer 2 · 2019-11-20T21:12:04Z

Kyle P answered Nov 20, '19 Kyle P commented Dec 2, '19

If you are doing this in the 3D model, I would suggest putting an 'OnExit' trigger on the processor which sends a message to where you'd like the flowitem to be made. Then on the location making the flowitem, put a 'OnMessage' trigger to create the item.

Here the flowitem rank is the number of the entry in the flowitem bin.

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Suhas H2 commented · Nov 26, 2019 at 11:49 AM

@Kyle P

In the from object(which sends the message processor in your case),what parameters(Values for param1,param2,param3) should i be sending?

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Suhas H2 commented · Nov 27, 2019 at 11:16 AM

In the processor 'On Exit' trigger, send message option what should be sent to the queue as Parameter 1, Parameter 2 and Parameter 3?

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Kyle P Suhas H2 commented · Dec 02, 2019 at 01:29 PM

@Suhas H2 I typically just use custom code to send the message, this is because using the custom code allows me to pass 3 labels in the parameters.

If you use the built in functionality, you lose the ability to pass labels but the parameters would map as follows:

Here, you can see that the built-in triggers use msgparam1 as the quantity and msgparam2 as the flowitem rank, but leaves no room for passing labels.

Through the code you can pass 3 variables (parameters) with in the message; so you have more flexibility in what you want to achieve. If you are always creating the same flowitem and the same quantity then you can utilize the 3 variables (parameters) as a way to pass labels to the newly created flowitem.

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