[VERSION 20.2.1] CONVEYOR TRANSFERS ISSUES

[fapicella]

[ FlexSim 20.2.1 ]

test_conveyor_1.fsm

Hi,

I realize this model where a Flowitem is moved between two conveyors with different heights through an elevator.

On the elevator I put another conveyor to simulate the entry and exit movements of Flowitem, after the elevator has arrived to destination. I change the direction of this conveyor reversing its velocity.

The realized process specifically follow this logic:

• Just created, the token waits in “pull from List” to pull some flowitem. The flowitem is pushed in the list when arrive on the exit transfer of first conveyor;
• Then the token waits the arrival of the elevator at right heigh;
• The speed of elevator’s conveyor is reset at initial value and then the flowitem is moved in it;
• It is simulated the enter of the flowitem for “move in” delay time and then the conveyor is stopped;
• Then the token waits the arrival of the elevator at right heigh again;
• The speed of elevator’s conveyor is inverted and It is simulated the exit of the flowitem for “move out” delay time;
• The loop repeats.

There are two issues that I point out:

• A graphic issue: when the conveyor inverts velocity, if you click on its ,the position of the transfers change. Should they remain fixed in their initial position?

• A Logic issue: if you first create the exit transfer and then the entry transfer on the conveyor on the elevator, the model it doesn’t work more good. Infact if you find in the tree this link Conveyor>variables/conveyorPoints, it is observed that the two treenode are reversed. In this case the item enters in the entry transfer of conveyor but immediately it enters also in the exit transfer and it goes out of elevators. Is it possible that a model is so sensitive to the order in which the connections are created?

I attached the model in the question

[philboboADSK · Accepted solution]

Neither of these issues are bugs. That's just how the conveyors work.

1. When you click a conveyor to move it, it finalizes its spatial changes to set the positions and connections with the objects around it and on it. This causes the transfers to change location because the conveyor is in a different location.

2. Since both of your transfers are on the same position along the conveyor, the order you created the connections affects the order they are ranked. Since you want the exit transfer to be after the entry transfer, make sure you connect them in that order. (Or move the exit transfer to one side and back to the end to re-rank it to the end of the list of transfers at that position.)

[fapicella]

Thank you very much!