I simulate the robot palletlize by combiner and pf ,at the begining of the model runing is good,but after sometime the 2nd inport of combiner can not receive any item,the state of combiner is collecting,the combiner didnot reach the target quantity,I donot know why,I can't find errors in my logic,I upload my model,hope it can help me to illustrate my issue.
thank you very much.