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Simulation using Two sources produces same part alternatively

Hello Guys,

I have a scenario where Operator A has to pick first part from Source A, perform his operation and activities.

Next cycle he has to pick part from Source B and continue his work.

 

Sequence is:- Source A,Source B, Source A,Source B....throughout the shift.

 

I have created a model with Source A.

Need help in implementing the above scenario.

 

Thanks,

Balaji S

9 REPLIES 9

Re: Simulation using Two sources produces same part alternatively

Phenom
Phenom

Have a look.

 

I took 2 stations , as you cannot assign brokers to sources

 

Unbenannt.PNG

 

 

 

 

Re: Simulation using Two sources produces same part alternatively

Hello,

 

Please find my simulation model attached.

 

Details mentioned below.

 

Part namePart coloursOperator namesSourceSource3
TrayRed colourOperator AWorkplace_AWorkplace_Y
Tray1Green colourOperator BWorkplace_XWorkplace_A1

 

When I change quantity of parts in Source and Source3 as 2 (for validation), this is what happens.

1) Operator A  goes to Source_Workplace_A_pick Tray (red color part)

2) Operator B  goes to Source3_Workplace_A1_pick Tray1 (green color part)

 

In 2nd cycle, Operator B goes to Source3 again and picks up Tray whereas he should actually go to Source_Workplace_X to pick Tray1(Green part).

 

Please help me on this issue.

 

 

 

Re: Simulation using Two sources produces same part alternatively

Phenom
Phenom

I have changed the transport services in Buffer3 / Buffer individually/ per entry method to "A" or "B",

 

depending what tray is selected.

 

And reduced the buffer sizes to 1 so always the right transport service is set.

 

Have a look

 

Re: Simulation using Two sources produces same part alternatively

Hi,

 

Thanks for hekping but I am facing a new issue now.

When I increase the quantity in source from 2 to -1 (actual value required for my project) the simulation stops after a certain time.

 

Reason:

Operator A:

Ideally he has to pick Tray from Buffer 4 and feed it  to Buffer 2.

Pick Carrier plate from Buffer 4 and feed it to Buffer 1.

Then go and pick up Tray from Buffer/Buffer3 and continue the cycle.

Operator B:

Ideally he has to pick Tray from Buffer 6 and feed it  to Buffer 2.

Pick Carrier plate from Buffer 6 and feed it to Buffer 5.

Then go and pick up Tray from Buffer/Buffer3 and continue the cycle.

 

But now Operator keeps going back and picking the part from Buffer/Buffer3 whereas he doesn't pick up Tray and go to Buffer 2.

 

I guess it has got to do something with Exit lock of Buffer/Buffer3.

Appreciate your support.

 

 

Re: Simulation using Two sources produces same part alternatively

Phenom
Phenom

Assuming that  you are talking about the model I updated in last post,

 

you should:

 

- delete CleaningB.EntranceLocked:=False in DryingB

- set higher priority (0->1) for Buffer 4 / 6

- increase the Carrier_plate count from 3 to  5 in Source2

- increase the Carrier_plate count from 3 to  5 in Source1

 

  to get it this time running with inifinite trays (source)

 

-

 

 

Re: Simulation using Two sources produces same part alternatively

Hi,

Actual scenario and customer requirment is number of Carrier plates should be ONLY 3.

 

Please help....

Re: Simulation using Two sources produces same part alternatively

Phenom
Phenom

a deadlock(s.b.)  occurs, if you set the carrier_plate count to 3 and tray1 count  to infinite

 

as the worker_B tries to dump a tray1 on assembly_station before placing the carrier_plate.

 

Therefore you should restrict the workerB from taking tray1s if

 

there are no carrier_plates available  (at the AssemblyStation) to dump the tray1s on.

 

Partially this deadlock can be compensated through the higher transport priority (=1)for the AssemblyStation.

 

But with 3 Carrier_plates for this side, this kind of compensation is not enough.

 

Same goes for Worker_A.

 

 

Unbenannt.PNG

 

 

Re: Simulation using Two sources produces same part alternatively

Hi,

 

So is there no other option to resolve this deadlock where 3 plates and infinite number of parts are used?

Re: Simulation using Two sources produces same part alternatively

Phenom
Phenom

as stated in last post

 

"Therefore you should restrict the workerB from taking tray1s if

 there are no carrier_plates available  (at the AssemblyStation) to dump the tray1s on."

 

At the moment the worker B is pushing trays1 to the assemblystation without being sure, if he/she  can

dump it on a carrier_plate.

 

If no carier_plate is there a deadlock occurs as he /she cannot dump the tray1 to fetch

a required Carrier_plate.

 

So , to prevent the deadlock situation, the workerB should  check, before picking a tray1, if he /she can dump it

at the target station

 

Then it probably also works with 3 Carrier_Plates