System for detecting the loading mass of a filler which is suspended on a hoisting cable of a crane

System for detecting the loading mass of a load (3) which is suspended on a hoisting rope (4) of a crane, comprising: a measuring arrangement for measuring the rope force in the hoisting rope (4) and a calculation unit (26) to determine the mass loading on the basis of the rope force, characterized in that the calculation unit (26) has a compensation unit and an observer mass load is based on a -mass model cable spring (4) and the load (3), wherein the calculation unit (26) describes the influence of the indirect determination of the mass load by the lifting cable in a dynamic model based it calculates the mass to charge and compensates at least partially.