topic AGV priority in FlexSim Forum

AGV priority

fred_ee — Sun, 08 May 2022 18:51:02 GMT

[ FlexSim 21.2.4 ]

Hi,

I have a problem with AGV pickup priorities. I want that AGV pick up empty tote and drive tote to the processor and then pick full tote if full tote is available.

My first model (AGV work) works fine because AGV first pick up from the PickUp queue and not from the processor.

In the second model (AGV not work) first pickup is from the processor. I want to set priority where AGV always pick up empty tote from the PickUp queue first and then replaces empty tote with full tote in the processor.

AGV not work.fsmAGV work.fsm

Hope you will understand my problem.

Thank you in advance for your answers.

Re: AGV priority

moehlmann_fe — Mon, 09 May 2022 06:51:07 GMT

The 'NextWorkPoint' connections are designed to be used in a loop. In your model, if the AGV doesn't find at its starting control point, the agv process flow will get stuck looking for the next point the AGV should travel to.

You can modify the process flow to allow the AGV to wait for a task at the 'dead end' control point.

In the 'Main Control Loop' section, split up the upper activity block and add a 'Wait for Event' activity as shown in the screenshot.

In the 'Get Next Work Point' activity, activate the 'Max Wait Time' option and set the token to be released through connection 2, if the timer (0s) elapses. Make sure that the second connection is the one leading to the 'Wait for Event'. Set that to wait for something to get pushed to the AGV Work List.

Now, if the AGV doesn't find a task at its location when first activated, it will wait for a new task to become available and check again if the new task is at the right location.

agv-not-work-adjusted-fm.fsm

Re: AGV priority

fred_ee — Mon, 09 May 2022 09:41:00 GMT

Thank you for your answer. I learned some new things from your answer. But anyway model agv-not-work-adjusted-fm.fsm is not working properly because the red tote is never picked by AGV. I still need FIFO output from PickUp queue.

Re: AGV priority

moehlmann_fe — Mon, 09 May 2022 10:30:43 GMT

It seems like I accidentaly deactivated the Pull Strategy of KM1 while checking some settings in your model. Just activate it again and it should work. Sorry for that.

Re: AGV priority

fred_ee — Mon, 09 May 2022 18:51:25 GMT

Thank you for your help. It works now 🙂 .