Truck suddenly loads other truck :-)

Hi,

I developed a model of internal traffic for a processing facility and tested the material flow/ task sequences for each product without problems. Now the model is completed and I realised, that at some point the trucks suddenly start loading other trucks instead of containers. Double checked connections, ports and task sequences, but simply cannot find the bug :-)

Anyone has a idea how such a strange effect can occur and how to solve it?

Below a screenshot and the model, it happens at approx. t = 7000

Thanks so much in advance,
Katharina

At time 6541.34 the first 'bad' task sequence that loads a truck is created by DSSPEBulk transportdispatcher trigger. At the end of that code you have a freeoperators task, but I don't see any Utilize tasks related to it - try removing that.

I entered this code on the passto of the LocalTruck dispatcher in order to detect the first bad tasksequence:

int tot=gettotalnroftasks(tasksequence);
int loadokay=1;
for (int n=1;loadokay&&n<=tot;n++){
	int tasktype=gettasktype(tasksequence,n);
	if (tasktype==TASKTYPE_LOAD||tasktype==TASKTYPE_FRLOAD ) {
		loadokay=not(isclasstype(gettaskinvolved(tasksequence,n,1),CLASSTYPE_TASKEXECUTER));
	}
}
if (not(loadokay)){
	stop();
	msg("Dispatcher Pass To","Detected load task with a truck as involved 1  - stopping",1);
}

Thanks so much! Yes in the beginning I was experimenting with UTILIZE and DELAY, so its a relict and I'd completely overseen it! Thank you so much, still new to Flexsim, reading through this forum and the other posts really helps me to learn it faster. Thanks Jason for your quick reply.

Warm regards, Katharina