question

Hello @jaehwan.s,

What you are looking for is actually a mix between 2 pickoptions:

• the Default Separator option
• the Round Robin option

By combining and adapting the code of the 2 pickoptions above, you can send the container to the 1st output port, and the content in a round robin fashion from outport port #2 to #4.

Here is the code used in the attached model 20210303-how-to-unload-to-multiple-destinations-wi.fsm:

int outputport = 0;

if(item.rank == 1){
    outputport = 1; //the container will exit through output port 1
}
else{
    //round robin from output port 2
    treenode curlabel = current.labels.assert("f_cursendport", 2);

    if (getoutput(current) == 0 && item.rank == 1)  
        current.f_cursendport = 2;  //reset round robin to 2 counter if first part

    outputport = curlabel.value;
    curlabel.value += 1;
    if (curlabel.value > current.outObjects.length)
        current.f_cursendport = 2; 
}

return outputport;

I also updated the transport reference such that the forklift (center port #1) is called when a flowitem exits through port 1 (i.e. the tote), and for all other outpout ports the operator will be called (center port #2 by default).

Hope this helps.