[ FlexSim 18.2.3 ]
Hi there,
The purpose of my model is to see how many elevators are sufficient for the certain number of volume of AGV trips. However, I would encounter this error after running for awhile.
I would appreciate any advice on how to run this model smoothly (be able to deliver to all floors and return to the parkpoints when job is done)
Thank you very much!
liftusage-1.fsm
Building an AGV network can sometimes be finicky. In the case above the cause is that the connecting path between level 8 and the base level is only a one-way path. I also noticed that some levels are missing a connecting path that allows the AGV to turn back onto the loop after it has dropped off its cargo.
Generally, the only thing you can do with that error message is check where the AGV and its destination CP are located and search the path between them for any errors/missing links.
One thing that might save you some headache could be to only use a single CP as park point for now (increase max. allocations so that all AGVs can occupy it at once). All of the parking paths connecting to a single point on the main loop is prone to errors.
Thank you Felix. I have tried connecting the paths in the other levels as well as changing into just one park point with increased allocations. The same error still occur. it seemed like it was one of the pick up control points.
Tried to have a different paths for drop off at level 8 but it still does not work. Would need your advice on this. Thank you!
As I mentioned, the path between level 8 and the base level is set to allow only travel in one direction. So the AGV can't return from level 8.
Changing that and removing the requirement to pull a park point from the list (since there is only one now) made the model run until completion. There are still exception with the OnEntry trigger of the queues though. I can see that they are supposed to move something after a delay. But the settings don't make much sense (centerport references that don't exist).
An "a-connection" is used to control the material flow. They mark to which object an item should be send and are used for the flow logic of fixed resources.
An "s-connection" doesn't have any default internal logic connected to it. It is generally used as a way to have a reference to another object in the model.
You mostly see this with the "Use Operator" or "Use Transport" options of processors etc. The default setting of "current.centerObjects[1]" means "The object connected with the first s-connection".
To disable an elevator all you have to do is remove it from the attached objects list of the Elevator process flow.
Currently the token first has to pull a pickup point before the travel is started. You can simply place a travel activity that sends the AGVs to the control point in front of the loading area before the Pull from List activity.
