What is the field load and what is the shelf load?

The bay load (C) is the total load-bearing capacity of a rack bay / the load between two rack uprights. The own weight does not count here.
The maximum weight that rests on the individual rack bay / shelf is called the bay load (B). The sum of the shelf loads must not exceed the bay load.
Point loads (A) are the forces acting on the floor in a point-like manner, also known as individual loads.