question

There's not really a simple way to have an Operator "follow an item" along a conveyor. What you could try to do is set up a series of DP along the conveyor, and create some custom Travel task sequences that force the Operator to travel to the certain DPs along the conveyor at the same time the item is moving, thus mimicking the idea that the Operator is following an item.

I've created a small example in Process Flow, that might help you. You'll notice the two things to get this to work is first having them in sync; and second (related to the first issue) is having the Operator travel at the same speed as the conveyor's speed. (So he won't rush ahead or fall behind.) To resolve these issues, we first need to stop the item along the conveyor, until the Operator can reach the destination, and then we change the Operator's "maxspeed" variable to match the conveyor's speed.

Here's the example:

followconveyoritem.fsm