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Hi @Fiona C, I would suggest checking out the conveyor tutorial for help with understanding how to send items by type and how to get the connections right. It looks like you had the connections correct in your model. Network nodes would be a good option for having the robot move along the rail.

That is a good question about whether to use the 3d logic or process flow logic. In a lot of cases, process flow and the 3d object logic are interchangeable and there isn't a right or wrong option (although 3d objects can be faster to use since the logic is already built in). Process flow is very useful when you are trying to do something that isn't built into the logic of 3d objects. Knowing what you can and can't do with the 3d objects becomes more clear the more experience you have with Flexsim. In your example, decision points already have built in logic that allows them to send items based on type. Because of this, I would probably use the 3d logic instead of process flow (although that doesn't mean it's "wrong" to use process flow). Part of the decision of when to use process flow is preference and part of it is when you need extra control over the logic in a certain part of your model.

The great thing about process flow and the 3d logic is that they can be used in the same model. Just because you use process flow for something doesn't mean you are stuck using process flow for the rest of the model. For example, you could use process flow to create items in a queue. You can move that item with process flow into a processor. Then you can use the processor 3d logic to process the item. If you want to have a better understanding of this, there are also some good tutorials here you can learn from.

I also updated your model so you can see how some of this works. robot-picking (1).fsm