Since the model does not have any root-level output ports or defined trim outputs
constraints, the operating point specification does not have any outputs. To add an output
to the operating point specification, on the Specification tab, click Add Outputs.In the Add Output Specifications dialog box, specify the signals to which you want to add
an output specification. To add a signal to the list, in the Simulink model window, click the
output signal of the rad/s to rpm block.1 Steady-State Operating Points