The vehicle/carrier logic on linear conveyor systems like this can be a little tricky. There are several ways to simplify the problem, with various trade-offs. In the case of this particular model, there is only one place where the vehicles queue up along the track. So we maintain a single queue of vehicles in the script. When we’re ready to drop-off the part, we send the vehicle at the front of the queue to the drop-off location, pop the vehicle off the queue and then move all the vehicles in the queue forwards.
You can see the scripts and component configuration for any model on the “explore” page by changing the subdomain from “play” to “simulate”: ABB Delta Robot Transfer System
You can also find the CAD on Onshape: ProtoTwin ABB Delta Robot Transfer System CAD
Let me know if you have any questions.