Fixed Pitch (or Power and Free) Conveyors allow for the inclusion of fixed-spaced hooks that can attach to Work Items at various points along the Work Item's length.
You can also access this feature by double-clicking on any Conveyor and accessing the Conveyor Properties dialog.
'Place At' functionality from the Pickplace feature is not compatible with Fixed Pitch Conveyors, Work Items must arrive at the front of any Conveyor of this type.
This value represents the spacing between the dog hooks on the Conveyor. This will be a fixed value property for the entire Conveyor object. The unit of measurement (ie, feet, meters) will depend on what has been set up in the simulation's distance preferences.