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A conveyor system is a combination of one or more types of conveyors which interact to move parts. Such a system may include branching, merging, and looping. The process of dividing conveyors into logical sections is fairly straightforward if you understand what constitutes a conveyor section.
For modeling purposes, a conveyor section is defined as any independently driven segment of conveyor of the same type. Conveyor turns are irrelevant as long as the conveyor remains unchanged and both are actuated or stopped together.
In ProModel, an accumulating conveyor section must end at the point where parts are permitted to accumulate or back up. This generally occurs at a transfer point or process location.