How to dispatch a preempting TS immediately

Hello,

In my model, a preempting TS is given to a dispatcher. I want it to immediately dispatch the TS to the TE instead of queueing it. I know I have to specify that in the Pass To function, but I don't know how to do that.
Did someone already does that?

Thanks

Alex

Alexandre,

If the PassTo trigger returns a port number for the task executer that is to recieve the task sequence then the task sequence will be passed on immediately. If the PassTo trigger returns a 0 then the task sequence will be queued up.

So, you need to make sure that your PassTo trigger on the dispatcher returns a value other than 0 when you send it a preemptive task sequence.

Brandon

Here's some code I have used successfully in a PassTo field of a Dispatcher to pass preempting tasksequences on immediately (so that they will actually get a chance to preempt another tasksequence), but queue up all non-preempting tasksequences (and possibly queue up preempting tasksequences that can not find a downstream TE that is either available, working on a non preempting tasksequence or working on a preempting tasksequence with lower priority). This entire code can be copied into a PassTo field.

treenode tasksequence = parnode(1);
treenode current = ownerobject(c);
/**Pass Preemptive TaskSequences to the Shortest Queue Having No Preempting Tasks of Equal or Higher Priority. All Other TaskSequences Queue-Up for First Available Object.*/
if(getpreempt(tasksequence) == 0)
    return 0;
int minindex = 0;
int curmin = 1000000;
for(int index = 1; index <= nrop(current); index++)
{
   treenode curobj = outobject(current,index);
   if(objectexists(curobj))
   {
     int curcontent = content(gettasksequencequeue(curobj));
     treenode activets = gettasksequence(curobj,0);
     if(curmin > curcontent
        && (!objectexists(activets) || !getpreempt(activets) || getpriority(activets) < getpriority(tasksequence))
     )
     {
         curmin = curcontent;
         minindex = index;
     }
   } 
}
return minindex;

One final note, in working with preempting tasksequences recently, I discovered a bug when using preempting tasksequences and connecting the TE's output ports back into a dispatcher in an attempt to redistribute bumped tasksequences to another TE. This is an obscure bug that most people will not run into, but a fix has been found and will be taken care of in the next Flexsim release.