Exchange input and output signals of a block, i.e., the previous block inputs become block outputs and the previous block outputs become block inputs. This block is used to construct inverse models. Its usage is demonstrated in example: Modelica.Blocks.Examples.InverseModel.
Note, if a block shall be inverted that has several input and output blocks, then this can be easily achieved by using a vector of InverseBlockConstraints instances:
InverseBlockConstraint invert; // Block to be inverted has 3 input signals