Items are placed in rack

If we set maximum items per cell more than one, the item will be place in rack as fig 1, but we often want it to be placed as fig 2.
How can we realize this function?

I've put together this model and a user command restackrackcell which is called by a delayed message on the entry and exit of the rack. It looks like you need to restack the cell when an object leaves (as the default logic relocates some items back to the default). I was planning to only restack on entry, so now that it restacks on exit, we only really need to set the position of the entering item, but for simplicity I've kept it to a single function that positions all items in the location.

The function assumes that in a given location (rack cell) all items are the same size, and uses the cell's space to stack the items. This means you should change the ysize of the rack to say how many deep you can stack. If the space is full it starts stacking in a virtual 'overflow' space outside the rack and sets the color to indicate the virtual overflow rack rank. So if you see colored items coming through it means you've exceeded the physical capacity of the rack at some point.

Update: Revised model to show different sized items and mixed width bays.

Thought I'd better mention that to get a properly constrained rack you'll still need to limit the capacity of bays etc.. There's a related post that might help with that here.

when I define the rack property of the rack as follow:
Place in Bay: "First Available Bay Maximum items per cell:3"
Place in Level: "First Available Level Maximum items per cell:3"


Then, the cell will be place in the Y direction. Now I just want them tobe palce in the X direction. I want to know how can I realize this function. IWho decides the place direction of the cell, the transporter or the define of the rack?
If the transporter defines the palce direction, which properties or codes decide it? where can I find it?
If the rack defines the palce direction, which properties or codes decide it? where can I find it?

thanks a lot!

It's the pick and place offset functions in the rack class that do that, so you'll not find that information on the Rack instance in the model. These functions do exist in the user space on the BasicFR but then you'd have to provide all the corresponding Rack logic yourself. That's why I provided the solution above.

If your concern with the above solution is to have the TaskExecuter move to exactly the correct location (which is more important for very large bays and levels) then turn off the offset travel for load and unload tasks and to compensate, issue the correct TRAVELTOLOC task before the load/unload task.