topic Re: Merge logic with photo eye in FlexSim Forum

Merge logic with photo eye

maxkmadiath — Sat, 06 Jan 2024 15:25:02 GMT

[ FlexSim 22.2.0 ]

i have a scenario where my 90-degree merges should stop for the blue line and wait till the bag pass. There should be a gap between bags. also, the blue conveyor needs to be bi-directional how i can attain it.Merge and bidirectional.fsm

Re: Merge logic with photo eye

joerg_vogel_HsH — Sun, 07 Jan 2024 10:43:38 GMT

Perhaps a 90 degree merge is not directly possible:

https://answers.flexsim.com/answers/22515/view.html

And bi-directional is under some circumstances possible, but it is not in general a supported feature.

Re: Merge logic with photo eye

jason_lightfoot_adsk — Mon, 08 Jan 2024 23:06:45 GMT

Here's an example of how you might try to implement something (using an object process flow for the PE) but without the sophistication needed to work in all cases - in fact the reverse time of 77.575 is selected specifically to avoid items in the transfer area and across the inline transfers. It might give you some ideas though (eg. have one conveyor rather than 5)

merge-and-bidirectional_jl.fsm

Please don't use this as-is and expect it to work.

Re: Merge logic with photo eye

moehlmann_fe — Tue, 09 Jan 2024 07:57:47 GMT

Here's a version that only uses triggers on decision points and the 'Space' settings of the conveyors to force gaps between items. It does work in both directions, however changing the direction while there are items on the conveyor will in many cases break the system.

merge-and-bidirectional-fm.fsm

I think, you'd get the best results by setting the conveyors how they would behave in the real system. Meaning managing the gaps by stopping/resuming whole conveyor sections instead of individual items.

Re: Merge logic with photo eye

maxkmadiath — Thu, 11 Jan 2024 03:46:05 GMT

Thanks, A lot @Jason Lightfoot ,

Can you tell me which function/script was used to change the direction of the conveyor? I am new to Flexsim so asked. Thanks

Re: Merge logic with photo eye

moehlmann_fe — Thu, 11 Jan 2024 06:59:41 GMT

Set the target speed of a conveyor to a negative value to have it move in the opposite direction.

Jason does this in a user event (multiplies the current target speed by -1).

Re: Merge logic with photo eye

jason_lightfoot_adsk — Thu, 11 Jan 2024 13:46:27 GMT

Thanks @Felix Möhlmann

Re: Merge logic with photo eye

maxkmadiath — Tue, 16 Jan 2024 10:52:49 GMT

Bidirectional.fsm@Jason Lightfoot I have a scenario in that case 2 bags need to go in 1 direction and 1 in the other direction how i can attain this? means a ratio of 2: 1 attached layout. I added two decision points. I want "T2.XR3.05.1-140" to be bidirectional

Re: Merge logic with photo eye

jason_lightfoot_adsk — Wed, 17 Jan 2024 15:53:58 GMT

Reverse its target speed - we've already shown how to do that in the previous example.
Also consider if you can do this left/right split without a reversing conveyor - it's basically one conveyor feeding two others.