Why a box disapears after the crane load it on a car ?

Hi,

In this attached model I try to load 2 boxes on 2 cars. When the first car is loaded with a box and the crane goes to pickup a box to loaded on the second car, the first box is removed from the first car !!!!!

Many thanks for your help.

Hi Jaouad :

Most of your usercommands and most of the model structure is calling a .dll so it is not easy just to debug that model on its own.

However, I think I found the problem on your task sequence.

On the OnMessage Trigger of the Crane, item is referenced as first(centerobject(current,1)) and this reference is the one that is inserted in both task sequences.

So unless you add the second item reference, the first box will disappear when the crane reaches the second car.

So from your example
---------------------------------

inserttask(ts,TASKTYPE_TRAVEL,centerobject(current ,1),NULL);
pt ("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRLOAD,item,centerobject(cu rrent,1),NULL);
pt ("TASKTYPE_FRLOAD");
inserttask(ts,TASKTYPE_TRAVEL,car,NULL);
//pt("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRUNLOAD,item,car,1);
//pt("TASKTYPE_FRUNLOAD");



inserttask(ts,TASKTYPE_TRAVEL,centerobject(current ,1),NULL);
pt ("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRLOAD,item,centerobject(current,1),NULL);
pt ("TASKTYPE_FRLOAD");
inserttask(ts,TASKTYPE_TRAVEL,car2,NULL);
//pt("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRUNLOAD,item,car2,NULL);
//pt("TASKTYPE_FRUNLOAD");
------------------------------------------------------------------

The one that is highlighted needs to reference another item.

Originally Posted by Juan Segui

Hi Jaouad :

Most of your usercommands and most of the model structure is calling a .dll so it is not easy just to debug that model on its own.

However, I think I found the problem on your task sequence.

On the OnMessage Trigger of the Crane, item is referenced as first(centerobject(current,1)) and this reference is the one that is inserted in both task sequences.

So unless you add the second item reference, the first box will disappear when the crane reaches the second car.

So from your example
---------------------------------

inserttask(ts,TASKTYPE_TRAVEL,centerobject(current ,1),NULL);
pt ("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRLOAD,item,centerobject(cu rrent,1),NULL);
pt ("TASKTYPE_FRLOAD");
inserttask(ts,TASKTYPE_TRAVEL,car,NULL);
//pt("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRUNLOAD,item,car,1);
//pt("TASKTYPE_FRUNLOAD");



inserttask(ts,TASKTYPE_TRAVEL,centerobject(current ,1),NULL);
pt ("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRLOAD,item,centerobject(current,1),NULL);
pt ("TASKTYPE_FRLOAD");
inserttask(ts,TASKTYPE_TRAVEL,car2,NULL);
//pt("TASKTYPE_TRAVEL");
inserttask(ts,TASKTYPE_FRUNLOAD,item,car2,NULL);
//pt("TASKTYPE_FRUNLOAD");
------------------------------------------------------------------

The one that is highlighted needs to reference another item.

Hi,

Thanks. Please, let me know a function which can choose a random item. I want to use a another function instead first(centerobject(current,1)).

Hi Jaouad :

You should take a look at using the function rank(container,index)

So, for the first object that is placed in your rack, you should say

treenode item = rank(centerobject(current,1), 1)

Now for the second box you would like to transport declare it

treenode Item2 = rank(centerobject(current,1),2);

and in the task sequence instead of item, point to Item2 for the second box

If you follow the logic subsequently, for the third box from the rack it will be

treenode Item3 = rank(centerobject(current,1),3);

I don't see a point in selecting a random box from your rack. If you need to take them in a different sequence than the one they have entered. You can point to a value from 1, up to the contents of the rack. However, you should be careful and need to prevent how are you going to have a different item every time?

Many thanks for your help Juan.
We found the same function rank

Hi,

I need to know how I can load two boxes, one near another, on car, not one above the other.

Hi Jaouad :

What you are trying to do doesn't change the behaviour of the objects inside Flexsim.

Assuming you are only going to load two boxes in one car, I would recommend you the following.

Try on the OnLoad trigger check if the car has a box inside (you would want to check for the content). If it does have a box inside, measure the object in size, and use from the picklist option

setloc(item, x,y,z)